Phan NEWS

??? ?? 2020, Phan 2.5.1 (dev)

New features(CLI, Configs):

Show empty union types as (empty union type) in issue messages instead of as an empty string.
Add a new CLI option --analyze-twice to run the analysis phase twice (#3743)

Phan infers additional type information for properties, return types, etc. while analyzing, and this will help it detect more potential errors. (on the first run, it would analyze files before some of those types were inferred)
Add a CLI option --analyze-all-files to analyze all files, ignoring exclude_analysis_file_list. This is potentially useful if third party dependencies are missing type information (also see --analyze-twice).
Add --dump-analyzed-file-list to dump all files Phan would analyze to stdout.
Add allow_overriding_vague_return_types to allow Phan to add inferred return types to functions/closures/methods declared with @return mixed or @return object. This is disabled by default.

When this is enabled, it can be disabled for individual methods by adding @phan-hardcode-return-type to the comment of the method. (if the method has any type declarations such as @return mixed)

Previously, Phan would only add inferred return types if there was no return type declaration. (also see --analyze-twice)

New features(Analysis):

Support parsing php 8.0 union types (and the static return type) in the polyfill. (#3419, #3634)
Emit PhanCompatibleUnionType and PhanCompatibleStaticType when the target php version is less than 8.0 and union types or static return types are seen. (#3419, #3634)
Be more consistent about warning about issues in values of class constants, global constants, and property defaults.
Infer key and element types from iterator_to_array()
Infer that modification of or reading from static properties all use the same property declaration. (#3760) Previously, Phan would track the static property's type separately for each subclass. (static properties from traits become different instances, in each class using the trait)
Make assignments to properties of the declaring class affect type inference for those properties when accessed on subclasses (#3760)

Note that Phan is only guaranteed to analyze files once, so if type information is missing, the only way to ensure it's available is to add it to phpdoc (UnknownElementTypePlugin can help) or use --analyze-twice.
Make internal checks if generic array types are strict subtypes of other types more accurate. (e.g. object[] is not a strict subtype of stdClass[], but stdClass[] is a strict subtype of object[])

Plugins:

Add UnknownClassElementAccessPlugin to warn about cases where Phan can't infer which class an instance method is being called on. (To work correctly, this plugin requires that Phan use a single analysis process)
Add MoreSpecificElementTypePlugin to warn about functions/methods where the phpdoc/actual return type is vaguer than the types that are actually returned by a method. This is a work in progress, and has a lot of false positives. (To work correctly, this plugin requires that Phan use a single analysis process)
Fix crash in PrintfCheckerPlugin when analyzing code where fprintf() was passed an array instead of a format string.

Bug fixes:

Fix bug causing Phan to fail to properly recursively analyze parameters of inherited methods (#3740) (i.e. when the methods are called on the subclass)
Fix ambiguity in the way Closure():T[] and callable():T[] are rendered in error messages. (#3731) Either render it as (Closure():T)[] or Closure():(T[])
Don't include both . and vendor/x/y/ when initializing Phan configs with settings such as --init --init-analyze-dir=. (#3699)
Be more consistent about resolving static in generators and template types.
Infer the iterable value type for Generator<V>. It was previously only inferred when there were 2 or more template args in phpdoc.
Don't let less specific type signatures such as @param object $x override the real type signature of MyClass $x (#3749)
Support PHP 7.4's ??= null coalescing assignment operator in the polyfill.
Fix crash analyzing invalid nodes such as 2 = $x in RedundantAssignmentPlugin.
Fix false positive unreferenced method warnings for methods from traits when the methods were referenced in base classes or interfaces of classes using those traits.

Language Server/Daemon mode:

Minor performance improvements for the language server/daemon when the use of pcntl is unavailable or disabled. (#3758)

Feb 20 2020, Phan 2.5.0

New Features(CLI):

Support using directory_suppressions in Phan baseline files in --load-baseline. (#3698)
Improve error message for warnings about Phan being unable to read files in the analyzed directory.

New Features(Analysis):

Instead of failing to parse intersection types in phpdoc entirely, parse them as if they were union types. (#1629) The annotations @phan-param, @phan-return, @phan-var, etc. can be used to override the regular phpdoc in the various cases where this behavior causes problems.

Future Phan releases will likely about unsupported phpdoc (e.g. int&string) and have actual support for intersection types.
Emit PhanUndeclaredConstantOfClass (severity critical) for undeclared class constants instead of PhanUndeclaredConstant (severity normal) This should not be confused with PhanUndeclaredClassConstant, which already exists and refers to accessing class constants of classes that don't exist.
Emit the expression that's an invalid object with issue types such as PhanTypeExpectedObject*, PhanTypeInvalidInstanceof (#3717)
Emit PhanCompatibleScalarTypePHP56 and PhanCompatibleAnyReturnTypePHP56 for function signatures when target_php_version is '5.6' (#915) (This also requires that backward_compatibility_checks be enabled.)
Use more accurate line numbers for warnings about function parameters.
When assume_real_types_for_internal_functions is on and a function has a non-empty return type in Reflection, make Phan's known real type signatures override the real reflection return type information (useful when Phan infers list<string> and Reflection says array). Phan previously used the type from Reflection.
Normalize phpdoc parameter and return types when there is a corresponding real type in the signature. (#3725) (e.g. convert bool|false|null to ?bool)

Plugins:

Add SubscribeEmitIssueCapability to detect or suppress issues immediately before they are emitted. (#3719)

Bug fixes:

Don't include issues that weren't emitted in the file generated by --save-baseline (#3719)
Fix incorrect file location for other definition in PhanRedefinedClassReference under some circumstances.
Fix incorrect issue name: PhanCompatibleNullableTypePHP71 should be named PhanCompatibleObjectTypePHP71
Fix false positive PhanPartialTypeMismatchProperty when a php 7.4 typed property has a default expression value (#3725)

Feb 13 2020, Phan 2.4.9

New Features(Analysis):

Infer that class_exists implies the first argument is a class-string, and that method_exists implies the first argument is a class-string or an object. (#2804, #3058)

Note that Phan still does not infer that the class or method actually exists.
Emit PhanRedefineClass on all occurrences of a duplicate class, not just the ones after the first occurrence of the class. (#511)
Emit PhanRedefineFunction on all occurrences of a duplicate function/method, not just the ones after the first.
Emit PhanRedefinedClassReference for many types of uses of user-defined classes that Phan has parsed multiple definitions of. Phan will not warn about internal classes, because the duplicate definition is probably a polyfill. (e.g. new DuplicateClass(), DuplicateClass::someMethod())

Bug fixes:

Fix false positive PhanParamSuspiciousOrder for preg_replace_callback (#3680)
Fix false positive PhanUnanalyzableInheritance for renamed methods from traits. (#3695)
Fix false positive PhanUndeclaredConstant previously seen for inherited class constants in some parse orders. (#3706)
Fix uncaught TypeError converting iterable<T> to nullable (#3709)

Jan 25 2020, Phan 2.4.8

Bug fixes:

Fix bug introduced in 2.4.7 where there were more false positives when --no-progress-bar was used. (#3677)

Jan 22 2020, Phan 2.4.7

New features(CLI, Configs):

Add an environment variable PHAN_NO_UTF8=1 to always avoid UTF-8 in progress bars. This may help with terminals or logs that have issues with UTF-8 output. Error messages will continue to include UTF-8 when part of the error.
Allow phan --init to complete even if composer.json has no configured autoload directories, as long as at least one directory or file was configured.
Add a setting error_prone_truthy_condition_detection that can be enabled to warn about error-prone truthiness/falsiness checks. New issue types:
- PhanSuspiciousTruthyCondition (e.g. for if ($x) where $x is object|int)
- PhanSuspiciousTruthyString (e.g. for ?string - '0' is also falsey in PHP)
Limit calculation of max memory usage to the running worker processes with --processes N (#3606)
Omit options that should almost always be on (e.g. analyze_signature_compatibility) from the output of phan --init (#3660)
Allow phan --init to create config file with target_php_version of '7.4' or '8.0' based on composer.json (#3671)

New Features(Analysis):

Infer that merging defined variables with possibly undefined variables is also possibly undefined. (#1942)
Add a fallback when some types of conditional check results in a empty union type in a loop: If all types assigned to the variable in a loop in a function are known, then try applying the condition to the union of those types. (#3614) (This approach was chosen because it needs to run only once per function)
Infer that assignment operations (e.g. +=) create variables if they were undefined.
Properly infer that class constants that weren't literal int/float/strings have real type sets in their union types.
Normalize union types of generic array elements after fetching $x[$offset]. (e.g. change bool|false|null to ?bool)
Normalize union types of result of ?? operator.
Fix false positives in redundant condition detection for the real types of array accesses. (#3638, #3645, #3650)
Support the non-empty-string type in phpdoc comments (neither '' nor '0'). Warn about redundant/impossible checks of non-empty-string.
Support the non-zero-int type in phpdoc comments. Infer it in real types and warn about redundant checks for zero/truthiness.
Support the the non-empty-mixed in phpdoc comments and in inferences.
Fix false positives possibly undefined variable warnings after conditions such as if (X || count($x = [])), if (X && preg_match(..., $matches)), etc.

Bug fixes:

Fix a crash analyzing assignment operations on $GLOBALS such as $GLOBALS['var'] += expr; (#3615)
Fix false positive Phan[Possibly]UndeclaredGlobalVariable after conditions such as assert($var instanceof MyClass when the variable was not assigned to within the file or previously analyzed files. (#3616)
Fix line number of 0 for some nodes when simplify_ast is enabled. (#3649)

Plugins:

Make Phan use the real type set of the return value of the function being analyzed when plugins return a union type without a real type set.

Maintenance:

Infer that explode() is possibly the empty list when $limit is possibly negative. (#3617)
Make Phan's code follow more PSR-12 style guidelines (<?php on its own line, function(): T instead of function() : T, declare visibility for class constants)
Internal: Check if strings are non-zero length in Phan's implementation instead of checking for variable truthiness. ('0' is falsey)
Show null as lowercase instead of uppercase (the way var_export renders it) in more places.

Dec 29 2019, Phan 2.4.6

New features(CLI, Configs):

Add more detailed instructions for installing dependencies new php installations on Windows without a php.ini
Handle being installed in a non-standard composer directory name (i.e. not vendor) (mentioned in #1612)

New Features(Analysis):

Improve inferred array shapes for multi-dimensional assignments or conditions on arrays (e.g. $x['first']['second'] = expr or if (cond($x['first']['second']))) (#1510, #3569)
Infer that array offsets are no longer possibly undefined after conditions such as if (!is_null($x['offset']))
Improve worst-case runtime when merging union types with many types (#3587)
Improve analysis of assignment operators. (#3597)
Infer $x op= expr and ++/-- operators have a literal value when possible, outside of loops. (#3250, #3248)
Move PhanUndeclaredInterface and PhanUndeclaredTrait warnings to the line number of the use/implements. (#2159)
Don't emit PhanUndeclaredGlobalVariable for the left side of ??/??= in the global scope (#3601)
More consistently infer that variables are possibly undefined if they are not defined in all branches. (#1345, #1942)
Add new issue types for possibly undeclared variables: PhanPossiblyUndeclaredVariable and PhanPossiblyUndeclaredGlobalVariable.

Plugins:

Add StrictLiteralComparisonPlugin to warn about loose equality comparisons of constant string/int to other values. (#2310)

Bug fixes:

Fix false positive PhanTypePossiblyInvalidDimOffset seen after other array fields get added to an array shape by assignment or condition (#3579, #3569)
Properly extract the value of binary integer literals and binary/hex/octal float literals in the polyfill/fallback parser. (#3586)

Dec 10 2019, Phan 2.4.5

Plugins:

When adding a plugin overriding the return type of a method, make it affect all methods of descendant classlikes that inherited that method definition.

New Features(Analysis)

Infer that !empty($x['field']...) also implies $x['field'] is non-falsey. (#3570)

Bug fixes:

Fix bug in native parsing of AST_TYPE_UNION (union type) nodes for PHP 8.0.0-dev.
Don't print duplicate entries for functions with alternate signatures in tool/make_stubs
Fix Error parsing internal template types such as non-empty-list<string> when using Type::fromFullyQualifiedString().
Fix warnings about password_hash() algorithm constants with php 7.4 (#3560) PASSWORD_DEFAULT became null in php 7.4, and other constants became strings.

Note that you will need to run Phan with both php 7.4 and a target_php_version of 7.4 to fix the errors.
Fix uncaught AssertionError when parsing @return \\... (#3573)

Nov 24 2019, Phan 2.4.4

New features(CLI, Configs):

When stderr is redirected a file or to another program, show an append-only progress bar by default. (#3514) Phan would previously disable the progress bar entirely by default.

The new --long-progress-bar CLI flag can be used to choose this progress bar.

(The --no-progress-bar CLI flag or the environment variable PHAN_DISABLE_PROGRESS_BAR=1 can be used to disable this)
Treat $var = $x['possibly undefined offset'] as creating a definitely defined variable, not a possibly undefined variable. (#3534)

The config setting convert_possibly_undefined_offset_to_nullable controls whether the field type gets cast to the nullable equivalent after removing undefined.

New features(Analysis):

Emit PhanPossiblyUndefinedArrayOffset for accesses to array fields that are possibly undefined. (#3534)
Warn about returning/not returning in void/non-void functions. New issue types: PhanSyntaxReturnValueInVoid, PhanSyntaxReturnExpectedValue
Infer that $var[$offset] = expr;/$this->prop[$offset] = expr; causes that element to be non-null (#3546)
Emit PhanEmptyForeachBody when iterating over a type that isn't Traversable with an empty statement list.
Warn about computing array_values for an array that is already a list. (#3540)
Infer the real type is still an array after assigning to a field of an array.

Plugins:

In DuplicateExpressionPlugin, emit PhanPluginDuplicateIfStatements if the body for else is identical to the above body for the if/elseif.

Maintenance:

Support native parsing of AST_TYPE_UNION (union type) nodes for PHP 8.0.0-dev.
Reduce memory usage after the polyfill/fallback parser parses ASTs (when the final AST isn't cached on disk from a previous run)
Make the error message for missing php-ast contain more detailed instructions on how to install php-ast.

Nov 20 2019, Phan 2.4.3

New features(CLI, Configs):

Support NO_COLOR environment variable. (https://no-color.org/) When this variable is set, Phan's error message and issue text will not be colorized unless the CLI arg --color or -c is used. This overrides the PHAN_ENABLE_COLOR_OUTPUT setting.
Add PHAN_DISABLE_PROGRESS_BAR environment variable to disable progress bar by default unless the CLI arg --progress-bar is used.
Show an extra decimal digit of precision in the progress bar when the terminal is wide enough. (#3514)

New features(Analysis):

Make inferred real types more accurate for equality/identity/instanceof checks.
Combine array shape types into a single union type when merging variable types from multiple branches. (#3506) Do a better job of invalidating the real union type of fields of array shape types when the field is only checked/set on some code branches.
Make issue suggestions (and CLI suggestions) for completions of prefixes case-insensitive.
Support @seal-properties and @seal-methods as aliases of @phan-forbid-undeclared-magic-properties and @phan-forbid-undeclared-magic-methods
More aggressively infer real types of array destructuring(e.g. [$x] = expr) and accesses of array dimensions (e.g. $x = expr[dim]) (#3481)

This will result in a few more false positives about potentially real redundant/impossible conditions and real type mismatches.
Fix false positives caused by assuming that the default values of properties are the real types of properties.
Infer that globals used in functions (global $myGlobal;) have unknown real types - don't emit warnings about redundant/impossible conditions. (#3521)

Plugins:

Also start checking if closures (and arrow functions) can be static in PossiblyStaticMethodPlugin
Add AvoidableGetterPlugin to suggest when $this->prop can be used instead of $this->getProp(). (This will suggest using the property instead of the getter method if there are no known method overrides of the getter. This is only checked for instance properties of $this)
Increase severity of PhanPluginPrintfNonexistentArgument to critical. It will become an ArgumentCountError in PHP 8.

Maintenance:

Bump minimum version of netresearch/jsonmapper to avoid php notices in the language server in php 7.4
Improve worst-case performance when analyzing code that has many possible combinations of array shapes.

Bug fixes:

Properly emit redundant and impossible condition warnings about uses of class constants defined as literal strings/floats/integers. (i.e. infer their real union types)
Fix false positive inference that $x[0] was string for $x of types such as list<\MyClass>|string (reported in #3483)
Consistently inherit analysis settings from parent classes recursively, instead of only inheriting them from the direct parent class. (#3472) (settings include presence of dynamic properties, whether undeclared magic methods are forbidden, etc.)
Don't treat methods that were overridden in one class but inherited by a different class as if they had overrides.
Fix a crash when running in php 8.0.0-dev due to Union Types being found in Reflection. (#3503)
Fix edge case looking up the extends class/interface name when the namespace is a use alias (#3494)

Nov 08 2019, Phan 2.4.2

New features(Analysis):

Emit PhanTypeInvalidCallExpressionAssignment when improperly assigning to a function/method's result (or a dimension of that result) (#3455)
Fix an edge case parsing (0)::class with the polyfill. (#3454)
Emit PhanTypeInvalidDimOffset for accessing any dimension on an empty string or an empty array. (#3385)
Warn about invalid string literal offsets such as 'str'[3], 'str'[-4], etc. (#3385)
Infer that arrays are non-empty and support array access from isset($x[$offset]) (#3463)
Make array_key_exists imply argument is a non-empty-array (or an object). (#3465, #3469)
Make isset($x[$offset]) imply argument is a non-empty-array, object, or string Make isset($x['literal string']) imply argument is a non-empty-array or object, and not a string.
Make isset($x->prop) imply $x is an object.
Make isset($this->prop[$x]) imply $this->prop is not the empty array shape. (#3467)
Improve worst-case time of deduplicating unique types in a union type (#3477, suggested in #3475)

Maintenance:

Update function signature maps for internal signatures.

Bug fixes:

Fix false positive PhanSuspiciousWeakTypeComparison for in_array/array_search/array_key_exists with function arguments defaulting to []

Nov 03 2019, Phan 2.4.1

New features(CLI, Configs):

Enable the progress bar by default, if STDERR is being rendered directly to a terminal. Add a new option --no-progress-bar.
Emit warnings about missing files in file_list, CLI args, etc. to STDERR. (#3434)
Clear the progress bar when emitting many types of warnings to STDERR.

New features(Analysis):

Suggest similarly named static methods and static properties for PhanUndeclaredConstant issues on class constants. (#3393)
Support @mixin (and an alias @phan-mixin) as a way to load public methods and public instance properties as magic methods and magic properties from another classlike. (#3237)

Attempts to parse or analyze mixins can be disabled by setting read_mixin_annotations to false in your Phan config.
Support @readonly as an alias of the @phan-read-only annotation.
Also emit PhanImpossibleTypeComparison for int === float checks. (#3106)
Emit PhanSuspiciousMagicConstant when using __METHOD__ in a function instead of a method.
Check return types and parameter types of global functions which Phan has signatures for, when ignore_undeclared_functions_with_known_signatures is false and PhanUndeclaredFunction is emitted. (#3441)

Previously, Phan would emit PhanUndeclaredFunction without checking param or return types.
Emit PhanImpossibleTypeComparison* and PhanSuspiciousWeakTypeComparison* when in_array or array_search is used in a way that will always return false.
Emit PhanImpossibleTypeComparison* when array_key_exists is used in a way that will always return false. (e.g. checking for a string literal or negative key in a list, an integer in an array with known string keys, or anything in an empty array)
Add some missing function analyzers: Infer that shuffle, rsort, natsort, etc. convert arrays to lists. Same for arsort, krsort, etc.
Convert to list or associative-array in sort/asort in more edge cases.
Infer that sort/asort on an array (and other internal functions using references) returns a real list or associative-array. Infer that sort/asort on a non-empty array (and other internal functions using references) returns a real non-empty-list or non-empty-associative-array.
Infer that some array operations (array_reduce, array_filter, etc.) result in array instead of non-empty-array (etc.)

Bug fixes:

Fix a bug where global functions, closures, and arrow functions may have inferred values from previous analysis unintentionally left over in the original scope when analyzing that function again. (methods were unaffected)

Maintenance:

Clarify a warning message about "None of the files to analyze in /path/to/project exist"

Plugins:

Add a new plugin RedundantAssignmentPlugin to warn about assigning the same value a variable already has to that variable. (#3424) New issue types: PhanPluginRedundantAssignment, PhanPluginRedundantAssignmentInLoop, PhanPluginRedundantAssignmentInGlobalScope
Warn about alignment directives and more padding directives ('x) without width directive in PrintfCheckerPlugin (#3317)
Also emit PhanPluginPrintfNoArguments in cases when the format string could not be determined. (#3198)

Oct 26 2019, Phan 2.4.0

New features(CLI, Configs):

Support saving and loading baselines with --save-baseline=.phan/baseline.php and --load-baseline=.phan/baseline.php. (#2000) --save-baseline will save all pre-existing issues for the provided analysis settings to a file. When Phan is invoked later with --load-baseline, it will ignore any issue kinds in the files from file_suppressions in the baseline.

This is useful for setting up analysis with Phan on a new project, or when enabling stricter analysis settings.

Different baseline files can be used for different Phan configurations. (e.g. .phan/baseline_deadcode.php for runs with --dead-code-detection)

New features(Analysis):

Fix edge cases in checking if some nullable types were possibly falsey (?true and literal floats (e.g. ?1.1))
Emit PhanCoalescingNeverNull instead of PhanCoalescingNeverNullIn* if it's impossible for the node kind to be null. (#3386)
Warn about array destructuring syntax errors ([] = $arr, [$withoutKey, 1 => $withKey] = $arr)
Return a clone of an existing variable if one already exists in Variable::fromNodeInContext. (#3406) This helps analyze PassByReferenceVariables.
Don't emit PhanParamSpecial2 for min/max/implode/join with a single vararg. (#3396)
Properly emit PhanPossiblyInfiniteRecursionSameParams for functions with varargs.
Emit PhanNoopNew or PhanNoopNewNoSideEffects when an object is created with new expr(...) but the result is not used (#3410) This can be suppressed for all instances of a class-like by adding the @phan-constructor-used-for-side-effects annotation to the class's doc comment.
Emit PhanPluginUseReturnValueInternalKnown for about unused results of function calls on the right hand side of control flow operators (??/?:/&&/||) (#3408)

Oct 20 2019, Phan 2.3.1

New features(CLI, Configs):

Instead of printing the full help when Phan CLI args or configuration is invalid, print just the errors/warnings and instructions and Type ./phan --help (or --extended-help) for usage.
Add an option --debug-signal-handler that can be used to diagnose why Phan or a plugin is slow or hanging. (Requires the pcntl module) This installs a signal handler that response to SIGINT (aka Ctrl-C), SIGUSR1, and SIGUSR2.
Print a single backtrace in the crash reporter with the file, line, and arguments instead of multiple backtraces.
Emit a warning suggesting using --long-option instead when -long-option[=value] is passed in.
Change colorization of some error messages. Print some warnings to stderr instead of using error_log().

New features(Analysis):

Emit PhanTypeMismatchPropertyRealByRef or PhanTypeMismatchPropertyByRef when potentially assigning an incompatible type to a php 7.4 typed property (or a property with a phpdoc type).
Warn about suspicious uses of + or += on array shapes or lists. (#3364) These operator will prefer the fields from the left hand side, and will merge lists instead of concatenate them. New issue types: PhanSuspiciousBinaryAddLists, PhanUselessBinaryAddRight
Improvements to inferred types of sort, array_merge, etc. (#3354)
Fix bug allowing any array shape type to cast to a list.
Warn about unnecessary branches leading to identical return statements in pure functions, methods, and closures (#3383) This check is only run on pure methods.

This requires that UseReturnValuePlugin be enabled and works best when 'plugin_config' => ['infer_pure_methods' => true] is set.
Allow list<X> to cast to array{0:X, 1?:X} (#3390)
Speed up computing line numbers of diagnostics in the polyfill/fallback parser when there are multiple diagnostics.

Language Server/Daemon mode:

Reduce the CPU usage of the language server's main process when the pcntl module is used to fork analysis processes (Unix/Linux).
Speed up serializing large responses in language server mode (e.g. when a string has an unmatched quote).

Oct 13 2019, Phan 2.3.0

New features(CLI, Configs):

Limit --debug-emitted-issues to the files that weren't excluded from analysis.

New features(Analysis):

Add support for list<T> and non-empty-list<T> in phpdoc and in inferred values. These represent arrays with consecutive integer keys starting at 0 without any gaps (e.g. function (string ...$args) {})
Add support for associative-array<T> and non-empty-associative-array<T> in phpdoc and in inferred values. (#3357)

These are the opposite of list<T> and non-empty-associative-list<T>. list cannot cast to associative-array and vice-versa. These represent arrays that are unlikely to end up with consecutive integer keys starting at 0 without any gaps. associative-array is inferred after analyzing code such as the following:
- Expressions such as [$uid1 => $value, $uid2 => $value2] with unknown keys
- Unsetting an array key of a variable.
- Adding an unknown array key to an empty array.
- Certain built-in functions, such as array_filter or array_unique, which don't preserve all keys and don't renumber array keys.
Note that array<string, T> is always treated like an associative array.

However, T[] (i.e. array<mixed, T>) is not treated like associative-array<mixed, T> (i.e. associative-array<T>). Phan will warn about using the latter (associative-array) where a list is expected, but not the former (array).
Allow omitting keys from array shapes for sequential array elements (e.g. array{stdClass, array} is equivalent to array{0:stdClass, 1:array}).
Add array key of array shapes in the same field order that php would for assignments such as $x = [10]; $x[1] = 11;. (#3359)
Infer that arrays are non-empty after analyzing code such as $x[expr] = expr or $x[] = expr.
Infer that arrays are possibly empty after analyzing code such as unset($x[expr]);.
Fix false positives in redundant condition detection when the source union type contains the mixed type.

Oct 03 2019, Phan 2.2.13

New features(CLI, Configs):

Always print 100% in --progress-bar after completing any phase of analysis. This is convenient for tools such as tool/phoogle that exit before starting the next phase.
Add GraphML output support to DependencyGraphPlugin. This allows tool/pdep output to be imported by Neo4j, Gephi and yEd
Add json output and import to tool/pdep For caching large graphs in order to generate multiple sub-graphs without re-scanning
Add setting infer_default_properties_in_construct. When this is enabled, infer that properties of $this are initialized to their default values at the start of __construct(). (#3213) (this is limited to instance properties which are declared in the current class (i.e. not inherited)). Off by default.
Add a config setting strict_object_checking. (#3262) When enabled, Phan will warn if some of the object types in the union type don't contain a property. Additionally, warn about definite non-object types when accessing properties. Also add --strict-object-checking to enable this setting.
Add CLI option --debug-emitted-issues={basic,verbose} to print the stack trace of when Phan emitted the issue to stderr. Useful for understanding why Phan emitted an issue.

New features(Analysis):

Disable simplify_ast by default. Phan's analysis of compound conditions and assignments/negations in conditions has improved enough that it should no longer be necessary.
Import more specific phpdoc/real array return types for internal global functions from opcache.
Emit PhanUndeclaredVariable and other warnings about arguments when there are too many parameters for methods. (#3245)
Infer real types of array/iterable keys and values in more cases.
Expose the last compilation warning seen when tokenizing or parsing with the native parser, if possible (#3263) New issue types: PhanSyntaxCompileWarning Additionally, expose the last compilation warning or deprecation notice seen when tokenizing in the polyfill.
Improve inference of when the real result of a binary operation is a float. (#3256)
Emit stricter warnings for more real type mismatches (#3256) (e.g. emit PhanTypeMismatchArgumentReal for float->int when strict_types=1, 'literal string'->int, etc.)
Consistently infer that variadic parameters are arrays with integer keys. (#3294)
Improve types inferred when the config setting enable_extended_internal_return_type_plugins is enabled.
Speed up sorting the list of parsed files, and avoid unnecessary work in --dump-parsed-file-list.
Emit PhanEmptyForeach and PhanEmptyYieldFrom when iterating over empty arrays.
Infer that properties of $this are initialized to their default values at the start of __construct(). (#3213) (this is limited to instance properties which are declared in the current class (i.e. not inherited)). To disable this, set infer_default_properties_in_construct to false.
Improve analysis of conditions on properties of $this, such as if (isset($this->prop['field1']['field2'])) (#3295)
Improve suggestions for PhanUndeclaredFunction. Properly suggest similar global functions for non-fully qualified calls in namespaces. Suggest new ClassName() as a suggestion for ClassName().
Improve suggestions for global constants (PhanUndeclaredConstant). Suggest similar constant names case-insensitively within the same namespace or the global namespace.
Suggest obvious getters and setters for instance properties in PhanAccessPropertyProtected and PhanAccessPropertyPrivate (#2540)
When strict_method_checking is enabled, warn if some of the object types in the union type don't contain that method. (#3262)
Make stronger assumptions about real types of global constants. Assume that constants defined with define(...) can have any non-object as its real type, to avoid false positives in redundant condition detection.
Properly infer that parameter defaults and global constants will resolve to null in some edge cases.
Emit PhanCompatibleDefaultEqualsNull when using a different constant that resolves to null as the default of a non-nullable parameter. (#3307)
Emit PhanPossiblyInfiniteRecursionSameParams when a function or method calls itself with the same parameter values it was declared with (in a branch). (#2893) (This requires unused variable detection to be enabled, when there are 1 or more parameters)
Analyze complex conditions such as switch (true), if (($x instanceof stdClass) == false), etc. (#3315)
Add a non-empty-array type, for arrays that have 1 or more elements. This gets inferred for checks such as if ($array), if (!empty($array)) (checks on count() are not supported yet) (non-empty-array<ValueT> and non-empty-array<KeyT, ValueT> can also be used in phpdoc)
Support checking if comparisons of types with more than one possible literal scalar are redundant/impossible. Previously, Phan would only warn if both sides had exactly one possible scalar value. (e.g. warn about 'string literal' >= $nullableBool)
Fix edge cases analyzing conditions on superglobals.
Be more consistent about when PhanTypeArraySuspiciousNullable is emitted, e.g. for ?mixed, array|null, etc.
Fix false positive impossible condition for casting mixed to an array.

Language Server/Daemon mode:

Fix logged Error when language server receives didChangeConfiguration events. (this is a no-op)

Plugins:

Fix failure to emit PhanPluginDescriptionlessComment* when a description would be automatically generated from the property or method's return type. (#3265)
Support checking for duplicate phpdoc descriptions of properties or methods within a class in HasPHPDocPlugin. Set 'plugin_config' => ['has_phpdoc_check_duplicates' => true] to enable these checks. (this skips deprecated methods/properties)
Implement LoopVariableReusePlugin, to detect reusing loop variables in nested loops. (#3045) (e.g. for ($i = 0; $i < 10; $i++) { /* various code ... */ foreach ($array as $i => $value) { ... } })

Maintenance:

Make \Phan\Library\None a singleton in internal uses.
Normalize folders in the config file generated by phan --init in the vendor autoload directories.
Update internal element types and documentation maps.

Bug fixes:

Consistently deduplicate the real type set of union types (fixes some false positives in redundant condition detection).
Fix \Phan\Debug's dumping representation of flags for ast\AST_DIM, ast\AST_ARRAY_ELEM, ast\AST_PARAM, ast\AST_ASSIGN_OP (??=), and ast\AST_CONDITIONAL.

This affects some crash reporting and tools such as internal/dump_fallback_ast.php
Fix some infinite recursion edge cases caused parsing invalid recursive class inheritance. (#3264)

Sep 08 2019, Phan 2.2.12

New features(CLI):

Improve error messages when the --init-* flags are provided without passing --init. (#3153) Previously, Phan would fail with a confusing error message.
New tool tool/pdep to visualize project dependencies - see tool/pdep -h (uses the internal plugin DependencyGraphPlugin)
Support running tool/phoogle (search for functions/methods by signatures) in Windows.
Add support for --limit <count> and --progress-bar to tool/phoogle.

New features(Analysis):

Support @phan-immutable annotation on class doc comments, to indicate that all instance properties are read-only.
- Phan does not check if object fields of those immutable properties will change. (e.g. $this->foo->prop = 'x'; is allowed)
- This annotation does not imply that methods have no side effects (e.g. I/O, modifying global state)
- This annotation does not imply that methods have deterministic return values or that methods' results should be used.
@phan-immutable is an alias of @phan-read-only. @phan-read-only was previously supported on properties.
Support @phan-side-effect-free annotation on class doc comments, to indicate that all instances of the class are @phan-immutable and that methods of the class are free of external side effects. (#3182)
- All instance properties are treated as read-only.
- Almost all instance methods are treated as @phan-side-effect-free - their return values must be used. (excluding a few magic methods such as __wakeup, __set, etc.) This does not imply that they are deterministic (e.g. rand(), file_get_contents(), and microtime() are allowed)
Add @phan-side-effect-free as a clearer name of what @phan-pure implied for methods.
Fix false positives for checking for redundant conditions with iterable and is_iterable.
Properly infer real types for is_resource checks and other cases where UnionType::fromFullyQualifiedRealString() was used.
Avoid false positives for the config setting 'assume_real_types_for_internal_functions'. Include all return types for many internal global functions for --target-php-version of 7.[0-4], including those caused by invalid arguments or argument counts.
Warn about division, modulo, and exponentiation by 0 (or by values that would cast to 0).
Fix a bug converting absolute paths to relative paths when the project directory is a substring of a subdirectory (#3158)
Show the real signature of the abstract method in PhanClassContainsAbstractMethod issues. (#3152)
Support analyzing php 7.3's is_countable(), and warn when the check is redundant or impossible (#3172)
Don't suggest $this->prop as an alternative to the undeclared variable $prop from a static method/closure. (#3174)
Make real return types of Closure::bind() and other closure helpers more accurate. (#3184)
Include use($missingVar) in suggestions for PhanUndeclaredVariable if it is defined outside the closure(s) scope. Also, suggest hardcoded globals such as $argv.
Warn about $this instanceof self and $this instanceof static being redundant.
Fix false positive PhanInvalidConstantExpression for php 7.4 argument unpacking (e.g. function f($x = [1, ...SOME_CONST]) {})
Emit PhanTypeMismatchArgumentInternalProbablyReal when the real type of an argument doesn't match Phan's signature info for a function (#3199) (but there is no Reflection type info for the parameter) Continue emitting PhanTypeMismatchArgumentInternal when the real type info of the argument is unknown or is permitted to cast to the parameter.
Improve analysis of switch statements for unused variable detection and variable types (#3222, #1811)
Infer the value of count() for union types that have a real type with a single array shape.
Fix false positive PhanSuspiciousValueComparisonInLoop for value expressions that contain variables.
Warn about redundant condition detection in more cases in loops.
Warn about PHP 4 constructors such as Foo::Foo() if the class has no namespace and __construct() does not exist. (#740) Infer that defining Foo::Foo() creates the method alias Foo::__construct().
Don't emit PhanTypeMismatchArgumentReal if the only cause of the mismatch is nullability of real types (if phpdoc types were compatible) (#3231)

Language Server/Daemon mode:

Ignore 'plugin_config' => ['infer_pure_methods' => true] in language server and daemon mode. (#3220) That option is extremely slow and memory intensive.

Plugins:

If possible, suggest the types that Phan observed during analysis with UnknownElementTypePlugin. (#3146)
Make InvalidVariableIssetPlugin respect the ignore_undeclared_variables_in_global_scope option (#1403)

Maintenance:

Correctly check for the number of cpus/cores on MacOS in Phan's unit tests (#3143)

Bug fixes:

Don't parse src/a.php and src\a.php twice if both paths are generated from config or CLI options (#3166)

Aug 18 2019, Phan 2.2.11

New features(Analysis):

Add a @phan-real-return annotation for functions/methods/closure (#3099), to make Phan act as if that method has the specified union type when analyzing callers for redundant conditions, etc. (if there was no real type). This can be used for multiple types, e.g. @phan-real-return string|false.
Improve union type inferred for clone() - It must be an object if clone() doesn't throw. Emit PhanTypePossiblyInvalidCloneNotObject for cloning possible non-objects when strict param checking is enabled.
Infer that new $expr() has a real type of object in all cases, not just common ones.
Improve real type inferred for +(expr)/-(expr)/~(expr) and warn about redundant conditions. This does not attempt to account for custom behavior for objects provided by PECL extensions.
Show argument names and types in issue messages for functions/methods for PhanParamTooFew and PhanParamTooMany.
Show more accurate columns for PhanSyntaxError for unexpected tokens in more cases.
Ignore scalar and null type casting config settings when checking for redundant or impossible conditions. (#3105)
Infer that empty($x) implies that the value of $x is null, an empty scalar, or the empty array.
Avoid false positives with if (empty($x['first']['second'])) - Do not infer any types for the offset 'first' if there weren't any already. (#3112)
Avoid some bad inferences when using the value of expressions of the form A || B.
Improve redundant condition detection for empty/falsey/truthy checks, self, and internal functions building or processing arrays.
Include strings that are suffixes of variable names, classes, methods, properties, etc. in issue suggestions for undeclared elements. (#2342)
Emit PhanTypeNonVarReturnByRef when an invalid expression is returned by a function declared to return a reference.
Support manually annotating that functions/methods/closures are pure with /** @phan-pure */. This is automatically inherited by overriding methods. Also see UseReturnValuePlugin and 'plugin_config' => ['infer_pure_methods' => true].

Plugins:

In UseReturnValuePlugin, support inferring whether closures, functions, and methods are pure when 'plugin_config' => ['infer_pure_methods' => true] is enabled. (they're expected to not have side effects and should have their results used)

This is a best-effort heuristic. This is done only for the functions and methods that are not excluded from analysis, and it isn't done for methods that override or are overridden by other methods.

Note that functions such as fopen() are not pure due to side effects. UseReturnValuePlugin also warns about those because their results should be used.

Automatic inference of function purity is done recursively.
Add EmptyMethodAndFunctionPlugin to warn about functions/methods/closures with empty statement lists. (#3110) This does not warn about functions or methods that are deprecated, overrides, or overridden.
Fix false positive in InvalidVariableIssetPlugin for expressions such as isset(self::$prop['field']) (#3089)

Maintenance:

Add example vim syntax highlighting snippet for Phan's custom phpdoc annotations to plugins/vim/syntax/phan.vim This makes it easier to tell if annotations were correctly typed.

Bug fixes:

Don't scan over folders that would be excluded by 'exclude_file_regex' while parsing. (#3088) That adds additional time and may cause unnecessary permissions errors.
Properly parse literal float union types starting with 0.

Aug 12 2019, Phan 2.2.10

New features(Analysis):

Add support for @param MyClass &$x @phan-ignore-reference, to make Phan ignore the impact of references on the passed in argument. (#3082) This can be used when the result should be treated exactly like the original type for static analysis.

Plugins:

In EmptyStatementListPlugin, warn about switch statements where all cases are no-ops. (#3030)

Bug fixes:

Fix infinite recursion seen when passing void to something expecting a non-null type. (#3085) This only occurs with some settings, e.g. when null_casts_as_any_type is true. (introduced in 2.2.9)

Aug 11 2019, Phan 2.2.9

New features(Analysis):

Emit the stricter issue type PhanTypeMismatchReturnReal instead of PhanTypeMismatchReturn when Phan infers that the real type of the returned expression is likely to cause a TypeError (accounting for strict_types in the file). (#403) See internal/Issue-Types-Caught-by-Phan.md for details on when it is thrown.
Emit the stricter issue type PhanTypeMismatchArgumentReal instead of PhanTypeMismatchArgument when Phan infers that the real type of the argument is likely to cause a TypeError at runtime (#403)
Support php 7.4 typed property groups in the polyfill/fallback parser.
Warn about passing properties with incompatible types to reference parameters (#3060) New issue types: PhanTypeMismatchArgumentPropertyReference, PhanTypeMismatchArgumentPropertyReferenceReal
Detect redundant conditions such as is_array($this->array_prop) on typed properties. Their values will either be a value of the correct type, or unset. (Reading from unset properties will throw an Error at runtime)
Emit PhanCompatibleTypedProperty if the target php version is less than 7.4 but typed properties are used.
Emit PhanTypeMismatchPropertyReal instead of PhanTypeMismatchProperty if the properties have real types that are incompatible with the inferred type of the assignment.
Stop warning about (float) $int being redundant - there are small differences in how ints and floats are treated by serialize, var_export, is_int, etc.
Treat all assignments to $this->prop in a scope the same way (for real, dynamic, and magic properties) Previously, Phan would not track the effects of some assignments to dynamic properties.
Make unset($this->prop) make Phan infer that the property is unset in the current scope (and treat it like null) (only affects $this). (#3025) Emit PhanPossiblyUnsetPropertyOfThis if the property is read from without setting it.
Don't emit PhanTypeArraySuspiciousNull when array access is used with the null coalescing operator. (#3032)
Don't emit PhanTypeInvalidDimOffset when array access is used with the null coalescing operator. (#2123)
Make Phan check for PhanUndeclaredTypeProperty suppressions on the property's doc comment, not the class. (#3047)
Make inferred real/phpdoc types for results of division more accurate.
Improve analysis of for loops and while loops. Account for the possibility of the loop iteration never occurring. (unless the condition is unconditionally true)
Fix some edge cases that can cause PhanTypeMismatchProperty (#3067, #1867) If there was a phpdoc or real type, check against that instead when emitting issues.
Analyze assignments to fields of properties of $this (e.g. $this->prop[] = 'value';) for correctness and for the new type combination. (#3059)
Infer that the void should be treated similarly to null (in addition to existing checks, it's redundant to compare them to null). Don't warn about return null; in functions/methods with phpdoc-only @return void.

Plugins:

Add StrictComparisonPlugin, which warns about the following issue types:
1. Using in_array or array_search without specifying $strict. (PhanPluginComparisonNotStrictInCall)
2. Using comparison or weak equality operators when both sides are possibly objects. (PhanPluginComparisonObjectEqualityNotStrict, PhanPluginComparisonObjectOrdering)
Don't warn in EmptyStatementListPlugin if a TODO/FIXME/"Deliberately empty" comment is seen around the empty statement list. (#3036) (This may miss some TODOs due to php-ast not providing the end line numbers) The setting 'plugin_config' => ['empty_statement_list_ignore_todos' => true] can be used to make it unconditionally warn about empty statement lists.
Improve checks for UseReturnValuePlugin for functions where warning depend on their arg count (call_user_func, trait/interface/class_exists, preg_match, etc)

Bug fixes:

When a typed property has an incompatible default, don't infer the union type from the default. (#3024)
Don't emit PhanTypeMismatchProperties for assignments to dynamic properties. (#3042)
Fix false positive RedundantConditions analyzing properties of $this in the local scope. (#3038)
Properly infer that real type is always int (or a subtype) after the is_int($var) condition.
Emit TypeMismatchUnpack* for nullable key types of iterables if the union type didn't contain any int/mixed types. (fix logic error)

Jul 30 2019, Phan 2.2.8

New features(CLI):

Add heuristics to tool/phoogle to better handle object, and to include functions with nullable params in the results of searches for all functions. (#3014)

New features(Analysis):

Emit PhanCompatibleImplodeOrder when the glue string is passed as the second instead of the first argument (#2089)
Emit PhanCompatibleDimAlternativeSyntax when using array and string array access syntax with curly braces when using the polyfill parser or php 7.4+. (#2989)
Emit PhanCompatibleUnparenthesizedTernary for expressions such as a ? b : c ? d : e. (#2989) (when using the polyfill parser or php 7.4+)
Emit PhanConstructAccessSignatureMismatch when a constructor is less visible than the parent class's constructor and the target php version is 7.1 or older. (#1405)

Plugins:

Make EmptyStatementListPlugin check if statements with negated conditions (those were previously skipped because they were simplified).

Bug fixes:

Fix a crash analyzing a dynamic property by reference (introduced in 2.2.7) (#3020)

Jul 27 2019, Phan 2.2.7

New features(CLI, Configs):

Include columns with most (but not all) occurrences of PhanSyntaxError (inferred using the polyfill - these may be incorrect a small fraction of the time)

When the error is from the native php-ast parser, this is a best guess at the column.

hide_issue_column can be used to remove the column from issue messages.
Add --absolute-path-issue-messages to emit absolute paths instead of relative paths for the file of an issue. (#1640) Note that this does not affect files within the issue message.
Properly render the progress bar when Phan runs with multiple processes (#2928)
Add an HTML output mode to generate an unstyled HTML fragment. Example CSS styles can be generated with internal/dump_html_styles.php
Add a light color scheme for white backgrounds.

New features(Analysis):

Fix failure to infer real types when an invoked function or method had a phpdoc @return in addition to the real type.
Infer union type from all classes that an instance method could possibly be, not just the first type seen in the expression's union type. (#2988)
Preserve remaining real union types after negation of instanceof checks (e.g. to check for redundant conditions).
Warn about throwing from __toString() in php versions prior to php 7.4. (#2805)
Emit PhanTypeArraySuspiciousNull for code such as null['foo'] (#2965)
If a property with no phpdoc type has a default of an empty array, assume that it's type can be any array (when reading it) until the first assignment is seen.
Attempt to analyze modifying dynamic properties by reference (e.g. $var->$prop when $prop is a variable with a known string)
For undeclared variables in the global scope, emit PhanUndeclaredGlobalVariable instead of PhanUndeclaredVariable to distinguish those from undeclared variables within functions/methods. (#1652)
Emit PhanCompatibleSyntaxNotice for notices such as the deprecated (real) cast in php 7.4, when the real parser is used (#3012)

Language Server/Daemon mode:

When PhanSyntaxError is emitted, make the start of the error range the column of the error instead of the start of the line.

Plugins:

Add EmptyStatementListPlugin to warn about empty statement lists involving if/elseif statements, try statements, and loops.
Properly warn about redundant @return annotations followed by other annotation lines in PHPDocRedundantPlugin.

Bug fixes:

Treat Foo::class as a reference to the class/interface/trait Foo (#2945)
Fix crash for (real) cast in php 7.4. (#3012)
Work around crash due to deprecation notices in composer dependencies in php 7.4

Jul 17 2019, Phan 2.2.6

New features(CLI, Configs):

Include files in completion suggestions for -P/--plugin in the completion script for zsh.

Bug fixes:

Fix crash analyzing && and || conditions with literals on both sides (#2975)
Properly emit PhanParamTooFew when analyzing uses of functions/methods where a required parameter followed an optional parameter. (#2978)

Jul 14 2019, Phan 2.2.5

New features(CLI, Configs):

Add -u as an alias of --unused-variable-detection, and -t as an alias of --redundant-condition-detection
Added a zsh completion script (plugins/zsh/_phan has installation instructions).
Added a bash completion script (plugins/bash/phan has installation instructions).

New features(Analysis):

Fix false positive PhanSuspiciousValueComparisonInLoop when both sides change in a loop. (#2919)
Detect potential infinite loops such as while (true) { does_not_exit_loop(); }. (Requires --redundant-condition-detection) New issue types: PhanInfiniteRecursion.
Track that the real type of an array variable is an array after adding fields to it (#2932) (affects redundant condition detection and unused variable detection)
Warn about adding fields to an unused array variable, if Phan infers the real variable type is an array. (#2933)
Check for PhanInfiniteLoop when the condition expression is omitted (e.g. for (;;) {})
Avoid false positives in real condition checks from weak equality checks such as if ($x == null) { if ($x !== null) {}} (#2924)
Warn about X ? Y : Y and if (cond1) {...} elseif (cond1) {...} in DuplicateExpressionPlugin (#2955)
Fix failure to infer type when there is an assignment (or ++$x, or $x OP= expr) in a condition (#2964) (e.g. return ($obj = maybeObj()) instanceof stdClass ? $obj : new stdClass();)
Warn about no-ops in for loops (e.g. for ($x; $x < 10, $x < 20; $x + 1) {}) (#2926)
Treat compact('var1', ['var2']) as a usage of $var1 and $var2 in --unused-variable-detection (#1812)

Bug fixes:

Fix crash in StringUtil seen in php 7.4-dev due to notice in hexdec() (affects polyfill/fallback parser).

Plugins:

Add InlineHTMLPlugin to warn about inline HTML anywhere in an analyzed file's contents. In the plugin_config config array, inline_html_whitelist_regex and inline_html_blacklist_regex can be used to limit the subset of analyzed files to check for inline HTML.
For UnusedSuppressionPlugin: 'plugin_config' => ['unused_suppression_whitelisted_only' => true] will make this plugin report unused suppressions only for issues in whitelist_issue_types. (#2961)
For UseReturnValuePlugin: warn about unused results of function calls in loops (#2926)
Provide the $node causing the call as a 5th parameter to closures returned by AnalyzeFunctionCallCapability->getAnalyzeFunctionCallClosuresStatic (this can be used to get the variable/expression for an instance method call, etc.)

Maintenance:

Made --polyfill-parse-all-element-doc-comments a no-op, it was only needed for compatibility with running Phan with php 7.0.
Minor updates to CLI help for Phan.
Restart without problematic extensions unless the corresponding PHAN_ALLOW_$extension flag is set. (#2900) These include uopz and grpc (when Phan would use pcntl_fork) - Phan already restarts without Xdebug.
Fix Debug::nodeToString() - Make it use a polyfill for ast\get_kind_name if the php-ast version is missing or outdated.

Jul 01 2019, Phan 2.2.4

New features(CLI, Configs):

Warn if any of the files passed in --include-analysis-file-list don't exist.

New features(Analysis):

Reduce false positives inferring the resulting type of $x++, --$x, etc. (#2877)
Fix false positives analyzing variable modification in elseif conditions (#2878, #2860) (e.g. no longer emit PhanRedundantCondition analyzing elseif ($offset = (int)$offset)) (e.g. do a better job inferring variables set in complex if condition expressions)
Warn about suspicious comparisons (e.g. new stdClass() <= new ArrayObject, 2 >= $bool, etc.) (#2892)
Infer real union types from function/method calls.
Don't emit the specialized *InLoop or *InGlobalScope issues for --redundant-condition-detection in more cases where being in a global or loop scope doesn't matter (e.g. if (new stdClass()))
Be more accurate about inferring real union types from array destructuring assignments. (#2901)
Be more accurate about inferring real union types from assertions that expressions are non-null. (#2901)
Support dumping Phan's internal representation of a variable's union type (and real union type) with '@phan-debug-var $varName' (useful for debugging)
Fix false positive PhanRedundantCondition analyzing if ([$a] = (expr)) (#2904)
Warn about suspicious comparisons that are always true or always false, e.g. the initial check for for ($i = 100; $i < 20; $i++) (#2888)
Emit PhanSuspiciousLoopDirection when a for loop increases a variable, but the variable is checked against a maximum (or the opposite) (#2888) e.g. for ($i = 0; $i <= 10; $i--)
Emit critical errors for duplicate use for class/namespace, function, or constant (#2897) New issue types: PhanDuplicateUseNormal, PhanDuplicateUseFunction, PhanDuplicateUseConstant
Emit PhanCompatibleUnsetCast for uses of the deprecated (unset)(expr) cast. (#2871)
Emit PhanDeprecatedClass, PhanDeprecatedTrait, and PhanDeprecatedInterface on the class directly inheriting from the deprecated class, trait, or interface. (#972) Stop emitting that issue when constructing a non-deprecated class inheriting from a deprecated class.
Include the deprecation reason for user-defined classes that were deprecated (#2807)
Fix false positives seen when non-template class extends a template class (#2573)

Language Server/Daemon mode:

Fix a crash - always run the language server or daemon with a single analysis process, regardless of CLI or config settings (#2898)
Properly locate the defining class for MyClass::class when the polyfill/fallback is used.
Don't emit color in responses from the daemon or language server unless the CLI flag --color is passed in.

Maintenance:

Warn if running Phan with php 7.4+ when the installed php-ast version is older than 1.0.2.
Make the AST caches for dev php versions (e.g. 7.4.0-dev, 8.0.0-dev) depend on the date when that PHP version was compiled.
Make the polyfill support PHP 7.4's array spread operator (e.g. [$a, ...$otherArray]) (#2786)
Make the polyfill support PHP 7.4's short arrow functions (e.g. fn($x) => $x*2)
Fix parsing of some_call(namespace\func_name()) in the polyfill

Jun 17 2019, Phan 2.2.3

New features(Analysis):

Reduce false positives about float not casting to int introduced in 2.2.2

Jun 17 2019, Phan 2.2.2

New features(Analysis):

Support inferring literal float types. Warn about redundant conditions with union types of floats that are always truthy/falsey.

Maintenance:

Support parsing PHP 7.4's numeric literal separator (e.g. 1_000_000, 0xCAFE_F00d, 0b0101_1111) in the polyfill (#2829)

Bug fixes:

Fix a crash in the Phan daemon on Mac/Linux (#2881)

Jun 16 2019, Phan 2.2.1

New features(CLI, Configs):

When printing help messages for errors in phan --init, print only the related options.
Make phan --init enable redundant_condition_detection when the strictest init level is requested. (#2849)
Add --assume-real-types-for-internal-functions to make stricter assumptions about the real types of internal functions (for use with --redundant-condition-detection). Note that in PHP 7 and earlier, internal functions would return null/false for incorrect argument types/argument counts, so enabling this option may cause false positives.

New features(Analysis):

Reduce the number of false positives of --redundant-condition-detection for variables in loops
Warn about more types of expressions causing redundant conditions (#2534, #822).
Emit PhanRedundantCondition and PhanImpossibleCondition for $x instanceof SomeClass expressions.
Emit PhanImpossibleCondition for is_array and is_object checks.

Bug fixes:

Fix issue that would make Phan infer that a redundant/impossible condition outside a loop was in a loop.
Avoid false positives analyzing expressions within assert().
Fix method signatures for php 7.4's WeakReference.
Fix false positives analyzing uses of __call and __callStatic (#702)
Fix false positive redundant conditions for casting callable to object types.

Jun 14 2019, Phan 2.2.0

New features(CLI, Configs):

Add --color-scheme <scheme> for alternative colors of outputted issues (also configurable via environment variable as PHAN_COLOR_SCHEME=<scheme>) Supported values: default, vim, eclipse_dark
Be consistent about starting parameter/variable names with $ in issue messages.
Add --redundant-condition-detection to attempt to detect redundant conditions/casts and impossible conditions based on the inferred real expression types.

New features(Analysis):

New issue types: PhanRedundantCondition[InLoop], PhanImpossibleCondition[InLoop] (when --redundant-condition-detection is enabled) (e.g. is_int(2) and boolval(true) is redundant, empty(2) is impossible).

Note: This has many false positives involving loops, variables set in loops, and global variables. This will be split into more granular issue types later on.

The real types are inferred separately (and more conservatively) from regular (phpdoc+real) expression types.

(these checks can also be enabled with the config setting redundant_condition_detection)
New issue types: PhanImpossibleTypeComparison[InLoop] (when --redundant-condition-detection is enabled) (#1807) (e.g. warns about $x = new stdClass(); assert($x !== null))
New issue types: PhanCoalescingAlwaysNull[InLoop], PhanCoalescingNeverNull[InLoop] (when --redundant-condition-detection is enabled) (e.g. warns about (null ?? 'other'), ($a >= $b) ?? 'default')
Infer real return types from Reflection of php and the enabled extensions (affects --redundant-condition-detection)
Make Phan more accurately infer types for reference parameters set in conditionals.
Make Phan more accurately infer types after try-catch blocks.
Make Phan more accurately check if a loop may be executed 0 times.
Fix issue causing results of previous method analysis to affect subsequent analysis in some edge cases (#2857)
Support the type callable-object in phpdoc and infer it from checks such as is_callable($var) && is_object($var) (#1336)
Support the type callable-array in phpdoc and infer it from checks such as is_callable($var) && is_array($var) (#2833)
Fix false positives in more edge cases when analyzing variables with type static (e.g. yield from $this;) (#2825)
Properly emit NonStaticCallToStatic in more edge cases (#2826)
Infer that <=> is -1|0|1 instead of int
Infer that eval with backticks is ?string instead of string

Maintenance:

Add updates to the function/method signature map from Psalm and PHPStan.

Bug fixes:

Fix a crash that occurred when an expression containing class-string<T> became nullable.

01 Jun 2019, Phan 2.1.0

New features(CLI, Configs):

Add more options to configure colorized output. (#2799)

The environment variable PHAN_ENABLE_COLOR_OUTPUT=1 and the config setting color_issue_messages_if_supported can be used to enable colorized output by default for the default output mode (text) when the terminal supports it.

This can be disabled by setting PHAN_DISABLE_COLOR_OUTPUT=1 or by passing the flag --no-color.
Colorize output of --help and --extended-help when --color is used or the terminal supports it. This can be disabled by setting PHAN_DISABLE_COLOR_OUTPUT=1 or by passing the flag --no-color.

New features(Analysis):

Support unary and binary expressions on literals/constants in conditions. (#2812) (e.g. assert($x === -(1)) and assert($x === 2+2) now infer that $x is -1 and 4, respectively)
Infer that static variables with no default are null.
Improve control flow analysis of unconditionally true/false branches.
Improve analysis of some ways to initialize groups of static variables. e.g. static $a = null; static $b = null; if ($a === null) { $a = $b = rand(0,10); } use($a, $b) will now also infer that $b is non-null.
Infer from return new static(); and return $this; that the return type of a method is @return static, not @return self (#2797) (and propagate that to inherited methods)
Fix some false positives when casting array types containing static to types containing the class or its ancestors. (#2797)
Add PhanTypeInstantiateAbstractStatic and PhanTypeInstantiateTraitStaticOrSelf as lower-severity warnings about return new self() and return new static() (#2797) (emitted in static methods of abstract classes)
Fix false positives passing static to other classes. (#2797)
Fix false positive seen when static implements ArrayAccess (#2797)

Language Server/Daemon mode:

Add --language-server-min-diagnostics-delay-ms <ms>, to work around race conditions in some language clients.

20 May 2019, Phan 2.0.0

New features(Analysis):

Add early support for PHP 7.4's typed properties. (#2314) (This is incomplete, and does not support inheritance, assignment, impossible conditions, etc.)
Change warnings about undeclared $this into a critical PhanUndeclaredThis issue. (#2751)
Fix the check for PhanUnusedVariableGlobal (#2768)
Start work on supporting analyzing PHP 7.4's unpacking inside arrays. (e.g. [1, 2, ...$arr1, 5]) (#2779) NOTE: This does not yet check all types of errors, some code is unmigrated, and the polyfill does not yet support this.
Improve the check for invalid array unpacking in function calls with iterable/Traversable parameters. (#2779)

Plugins:

Improve help messages for internal/dump_fallback_ast.php (this tool may be of use when developing plugins)

Bug fixes:

Work around issues parsing binary operators in PHP 7.4-dev. Note that the latest version of php-ast (currently 1.0.2-dev) should be installed if you are testing Phan with PHP 7.4-dev.

13 May 2019, Phan 2.0.0-RC2

New features(Analysis):

Support analysis of PHP 7.4's short arrow function syntax (fn ($arg) => expr) (#2714) (requires php-ast 1.0.2dev or newer)

Note that the polyfill does not yet support this syntax.
Infer the return types of PHP 7.4's magic methods __serialize() and __unserialize(). (#2755) Improve analysis of return types of other magic methods such as __sleep().
Support more of PHP 7.4's function signatures (e.g. WeakReference) (#2756)
Improve detection of unused variables inside of loops/branches.

Plugins:

Detect some new php 7.3 functions (array_key_first, etc.) in UseReturnValuePlugin.
Don't emit a PhanNativePHPSyntaxCheckPlugin error in InvokePHPNativeSyntaxCheckPlugin due to a shebang before declare(strict_types=1)
Fix edge cases running PhanNativePHPSyntaxCheckPlugin on Windows (in language server/daemon mode)

Bug fixes:

Analyze the remaining expressions in a statement after emitting PhanTraitParentReference (#2750)
Don't emit PhanUndeclaredVariable within a closure if a use variable was undefined outside of it. (#2716)

09 May 2019, Phan 2.0.0-RC1

New features(CLI, Configs):

Enable language server features by default. (#2358) --language-server-disable-go-to-definition, --language-server-disable-hover, and --language-server-disable-completion can be used to disable those features.

Backwards Incompatible Changes:

Drop support for running Phan with PHP 7.0. (PHP 7.0 reached its end of life in December 2018) Analyzing codebases with --target-php-version 7.0 continues to be supported.
Require php-ast 1.0.1 or newer (or the absence of php-ast with --allow-polyfill-parser) Phan switched from using AST version 50 to version 70.

Plugins:

Change PluginV2 to PluginV3 PluginV2 and its capabilities will continue to work to make migrating to Phan 2.x easier, but PluginV2 is deprecated and will be removed in Phan 3.

PluginV3 has the same APIs and capabilities as PluginV2, but uses PHP 7.1 signatures (void, ?MyClass, etc.)
Third party plugins may need to be upgraded to support changes in AST version 70, e.g. the new node kinds AST_PROP_GROUP and AST_CLASS_NAME
Add PHPDocToRealTypesPlugin to suggest real types to replace (or use alongside) phpdoc return types. This does not check that the phpdoc types are correct.

--automatic-fix can be used to automate making these changes for issues that are not suppressed.
Add PHPDocRedundantPlugin to detect functions/methods/closures where the doc comment just repeats the types in the signature. (or when other parts don't just repeat information, but the @return void at the end is redundant)
Add a BeforeAnalyzePhaseCapability. Unlike BeforeAnalyzeCapability, this will run after methods are analyzed, not before.

09 May 2019, Phan 1.3.4

Bug fixes:

Fix bug in Phan 1.3.3 causing polyfill parser to be used if the installed version of php-ast was older than 1.0.1.

08 May 2019, Phan 1.3.3

New features(CLI, Configs):

Make the progress bar guaranteed to display 100% at the end of the analysis phase (#2694) Print a newline to stderr once Phan is done updating the progress bar.
Add maximum_recursion_depth - This setting specifies the maximum recursion depth that can be reached during re-analysis. Default is 2.
Add --constant-variable-detection - This checks for variables that can be replaced with literals or constants. (#2704) This is almost entirely false positives in most coding styles, but may catch some dead code.
Add --language-server-disable-go-to-definition, --language-server-disable-hover, and --language-server-disable-completion (These are already disabled by default, but will be enabled by default in Phan 2.0)

New features(Analysis):

Emit PhanDeprecatedClassConstant for code using a constant marked with @deprecated.
When recursively inferring the return type of BaseClass::method() from its return statements, make that also affect the inherited copies of that method (SubClass::method()). (#2718) This change is limited to methods with no return type in the phpdoc or real signature.
Improve unused variable detection: Detect more unused variables for expressions such as $x++ and $x -= 2 (#2715)
Fix false positive PhanUnusedVariable after assignment by reference (#2730)
Warn about references, static variables, and uses of global variables that are probably unnecessary (never used/assigned to afterwards) (#2733) New issue types: PhanUnusedVariableReference, PhanUnusedVariableGlobal, PhanUnusedVariableStatic
Warn about invalid AST nodes for defaults of properties and static variables. (#2732)
Warn about union types on properties that might have an incomplete suffix. (e.g. /** @var array<int, */) (#2708)

Plugins:

Add more forms of checks such as $x !== null ? $x : null to PhanPluginDuplicateConditionalNullCoalescing (#2691)

28 Apr 2019, Phan 1.3.2

New features(CLI, Configs):

Add --debug/-D flag to generate verbose debug output. This is useful when looking into poor performance or unexpected behavior (e.g. infinite loops or crashes).
Suggest similarly named plugins if --plugin SomePluginName refers to a built-in plugin that doesn't exist.
Add assume_no_external_class_overrides - When enabled, Phan will more aggressively assume class elements aren't overridden.
- e.g. infer that non-final methods without return statements have type void. Disabled by default.

New features(Analysis):

Support locally tracking assignments to and conditionals on $this->prop inside of function scopes. (#805, #204)

This supports only one level of nesting. (i.e. Phan will not track $this->prop->subProp or $this->prop['field'])

Properties are deliberately tracked for just the variable $this (which can't be reassigned), and not other variables.
Fix false positives with dead code detection for internal stubs in autoload_internal_extension_signatures. (#2605)
Add a way to escape/unescape array shape keys (newlines, binary data, etc) (#1664)

e.g. @return array{\n\r\t\x01\\:true} in phpdoc would correspond to return ["\n\r\t\x01\\" => true];

Plugins:

Add FFIAnalysisPlugin to avoid false positives in uses of PHP 7.4's FFI\CData (#2659) (C data of scalar types may be read and assigned as regular PHP data. $x = FFI::new(“int”); $x = 42;)

Note that this is only implemented for variables right now.

20 Apr 2019, Phan 1.3.1

New features(Analysis):

Fix false positive PhanTypeMismatchReturnNullable and PhanTypeMismatchArgumentNullable introduced in 1.3.0 (#2667)
Emit PhanPossiblyNullTypeMismatchProperty instead of PhanTypeMismatchProperty when assigning ?T to a property expecting a compatible but non-nullable type.

(The same issue was already emitted when the internal union type representation was T|null (not ?T) and strict property type checking was enabled)

Plugins:

Add PossiblyStaticMethodPlugin to detect instance methods that can be changed to static methods (#2609)
Fix edge cases checking if left/right-hand side of binary operations are numbers in NumericalComparisonPlugin

19 Apr 2019, Phan 1.3.0

New features(Analysis):

Fix false positive UnusedSuppression when a doc comment suppresses an issue about itself. (#2571)
Improve analysis of argument unpacking with reference parameters, fix false positive PhanTypeNonVarPassByRef (#2646)
In issue descriptions and suggestions, replace invalid utf-8 (and literal newlines) with placeholders (#2645)
Suggest typo fixes in PhanMisspelledAnnotation for @phan-* annotations. (#2640)
Emit PhanUnreferencedClass when the only references to a class or its elements are within that class. Previously, it would fail to be emitted when a class referenced itself.
Emit PhanUnusedPublicNoOverrideMethodParameter for method parameters that are not overridden and are not overrides. (#2539)

This is expected to have a lower false positive rate than PhanUnusedPublicMethodParameter because parameters might be unused by some of the classes overriding/implementing a method.

Setting unused_variable_detection_assume_override_exists to true in .phan/config.php can be used to continue emitting the old issue names instead of *NoOverride* equivalents.
Warn about more numeric operations(+, /, etc) on unknown strings and non-numeric literal strings (#2656) The settings scalar_implicit_cast and scalar_implicit_partial affect this for the string union type but not for literals.
Improve types inferred from checks such as if (is_array($var['field'])) { use($var['field']); } and if ($var['field'] instanceof stdClass) {...} (#2601)
Infer that $varName is non-null and an object for conditions such as if (isset($varName->field['prop']))
Be more consistent about warning when passing ?SomeClass to a parameter expecting non-null SomeClass.
Add PhanTypeMismatchArgumentNullable* and PhanTypeMismatchReturnNullable when the main reason the type check failed was nullability

Previously, Phan would fail to detect that some nullable class instances were incompatible with the non-null expected types in some cases.
Improve analysis of negation of instanceof checks on nullable types. (#2663)

Language Server/Daemon mode:

Analyze new but unsaved files, if they would be analyzed by Phan once they actually were saved to disk.

Plugins:

Warn about assignments where the left and right hand side are the same expression in DuplicateExpressionPlugin (#2641) New issue type: PhanPluginDuplicateExpressionAssignment

Deprecations:

Print a message to stderr if the installed php-ast version is older than 1.0.1. A future major Phan version of Phan will probably depend on AST version 70 to support new syntax found in PHP 7.4.
Print a message to stderr if the installed PHP version is 7.0. A future major version of Phan will require PHP 7.1+ to run.

Phan will still continue to support setting target_php_version to '7.0' and --target-php-version 7.0 in that release.

Bug fixes:

Fix edge cases in how Phan checks if files are in exclude_analysis_directory_list (#2651)
Fix crash parsing comma in string literal in array shape (#2597) (e.g. @param array{0:'test,other'} $x)

06 Apr 2019, Phan 1.2.8

New features(CLI):

Fix edge cases initializing directory list and target versions of config files (#2629, #2160)

New features(Analysis):

Support analyzing if (false !== is_string($var)) and similar complex conditions. (#2613)
Emit PhanUnusedGotoLabel for labels without a corresponding goto in the same function scope. (#2617) (note that Phan does not understand the effects of goto on control flow)
Don't emit PhanUnreferencedClass for anonymous classes. (#2604)
Detect undeclared types in phpdoc callables and closures. (#2562)
Warn about unreferenced PHPDoc @property/@property-read/@property-write annotations in --dead-code-detection. New issue types: PhanWriteOnlyPHPDocProperty, PhanReadOnlyPHPDocProperty, PhanUnreferencedPHPDocProperty.

Maintenance:

Make escaped string arguments fit on a single line for more issue types.
Rename UseContantNoEffect to UseConstantNoEffect.
Rename AddressableElement::isStrictlyMoreVisibileThan() to isStrictlyMoreVisibleThan.

Plugins:

Fix edge case where WhitespacePlugin would not detect trailing whitespace.
Detect PhanPluginDuplicateSwitchCaseLooseEquality in DuplicateArrayKeyPlugin. (#2310) Warn about cases of switch cases that are loosely equivalent to earlier cases, and which might get unexpectedly missed because of that. (e.g. 0 and 'foo')

Bug fixes:

Catch and handle "Cannot access parent when not in object context" when parsing global functions incorrectly using parent parameter type. (#2619)
Improve the performance of --progress-bar when the terminal width can't be computed by symfony. (#2634)

22 Mar 2019, Phan 1.2.7

New features(CLI,Configs)

Use a progress bar for --progress-bar on Windows instead of printing dots. (#2572) Use ASCII characters for the progress bar instead of UTF-8 if the code page isn't utf-8 or if Phan can't infer the terminal's code page (e.g. in PHP < 7.1)

Language Server/Daemon mode:

Make "Go to Definition" work when the constructor of a user-defined class is inherited from an internal class. (#2598)

Maintenance:

Update tolerant-php-parser version to 0.0.17 (fix parsing of some edge cases, minor performance improvement, prepare to support php 7.4 in polyfill)
Use paratest for phpunit tests in Travis/Appveyor

Bug fixes:

Make the codeclimate plugin analyze the correct directory. Update the dependencies of the codeclimate plugin. (#2139)
Fix false positive checking for undefined offset with $foo['strVal'] when strings are in the union type of $foo (#2541)
Fix crash in analysis of call_user_func (#2576)
Fix a false positive PhanTypeInvalidDimOffset for unset on array fields in conditional branches. (#2591)
Fix edge cases where types for variables inferred in one branch affect unrelated branches (#2593)

09 Mar 2019, Phan 1.2.6

New features(CLI,Configs)

Add config enable_extended_internal_return_type_plugins to more aggressively infer literal values for functions such as json_decode, strtolower, implode, etc. (disabled by default),
Make --dead-code-detection load UnreachableCodePlugin if that plugin isn't already loaded (#1824)
Add --automatic-fix to fix any issues Phan is capable of fixing (currently a prototype. Fixes are guessed based on line numbers). This is currently limited to:
- unreferenced use statements on their own line (requires --dead-code-detection).
- issues emitted by WhitespacePlugin (#2523)
- unqualified global function calls/constant uses from namespaces (requires NotFullyQualifiedUsagePlugin) (will do the wrong thing for functions that are both global and in the same namespace)

New features(Analysis):

Make Phan infer more precise literal types for internal constants such as PHP_EOF. These depend on the PHP binary used to run Phan.

In most cases, that shouldn't matter.
Emit PhanPluginPrintfVariableFormatString in PrintfCheckerPlugin if the inferred format string isn't a single literal (#2431)
Don't emit PhanWriteOnlyPrivateProperty with dead code detection when at least one assignment is by reference (#1658)
Allow a single hyphen between words in @suppress issue-name annotations (and @phan-suppress-next-line issue-name, etc.) (#2515) Note that CamelCase issue names are conventional for Phan and its plugins.
Emit PhanCompatibleAutoload when using function __autoload() {} instead of spl_autoload_register() {} (#2528)
Be more aggressive about inferring that the result is null when accessing array offsets that don't exist. (#2541)
Fix a false positive analyzing array_map when the closure has a dependent return type. (#2554)
Emit PhanNoopArrayAccess when an array field is fetched but not used (#2538)

Language Server/Daemon mode:

Fix an error in the language server on didChangeConfiguration
Show hover text of ancestors for class elements (methods, constants, and properties) when no summary is available for the class element. (#1945)

Maintenance

Don't exit if the AST version Phan uses (currently version 50) is deprecated by php-ast (#1134)

Plugins:

Write PhanSelfCheckPlugin for self-analysis of Phan and plugins for Phan. (#1576) This warns if too many/too few arguments are provided for the issue template when emitting an issue.
Add AutomaticFixCapability for plugins to provide fixes for issues for --automatic-fix (#2549)
Change issue messages for closures in UnknownElementTypePlugin (#2543)

Bug fixes:

Fix bug: --ignore-undeclared failed to properly ignore undeclared elements since 1.2.3 (#2502)
Fix false positive PhanTypeInvalidDimOffset for functions nested within other functions.
Support commas in the union types of parameters of magic methods (#2507)
Fix parsing ?(A|B|C) (#2551)

27 Feb 2019, Phan 1.2.5

New features(Analysis):

Cache ASTs generated by the polyfill to disk by default, improving performance of the polyfill parser. (e.g. affects use cases where php-ast is not installed and --use-polyfill-parser is enabled).

ASTs generated by the native parser (php-ast) are not cached.

(For the language server/daemon mode, Phan stops reading from/writing to the cache after it finishes initializing)
Be more consistent warning about invalid callables passed to internal functions such as register_shutdown_function (#2046)
Add @phan-suppress-next-next-line to suppress issues on the line 2 lines below the comment. This is useful in block comments/doc comments. (#2470)
Add @phan-suppress-previous-line to suppress issues on the line above the comment. (#2470)
Detect PhanRedefineClassConstant and PhanRedefineProperty when class constants and properties are redefined. (#2492)

New features(CLI):

Add --disable-cache to disable the disk cache of ASTs generated by the polyfill.

Language Server/Daemon mode:

Show plaintext summaries of internal classes, functions, methods, constants, and properties when hover text is requested.
Show descriptions of superglobals and function parameters when hovering over a variable.

Maintenance

Render the constants in PhanUndeclaredMagicConstant as __METHOD__ instead of MAGIC_METHOD

Plugins:

Add WhitespacePlugin to check for trailing whitespace, tabs, and carriage returns in PHP files.
Add HandleLazyLoadInternalFunctionCapability so that plugins can modify Phan's information about internal global functions when those functions are loaded after analysis starts.
Add SuspiciousParamOrderPlugin which guesses if arguments to functions are out of order based on the names used in the argument expressions.

E.g. warns about invoking function example($first, $second, $third) as example($mySecond, $myThird, $myFirst)
Warn if too many arguments are passed to emitIssue, emitPluginIssue, etc. (#2481)

Bug fixes:

Support parsing nullable template types in PHPDoc (e.g. @return ?T)
Allow casting null to ?\MyClass<\Something>.
Fix false positive PhanUndeclaredMagicConstant for __METHOD__ and __FUNCTION__ in function/method parameters (#2490)
More consistently emit PhanParamReqAfterOpt in methods (#1843).

18 Feb 2019, Phan 1.2.4

New features(Analysis):

Inherit more specific phpdoc template types even when there are real types in the signature. (#2447) e.g. inherit @param MyClass<T> and @return MyClass<U> from the ancestor class of function someMethod(MyClass $x) : MyClass {}.

This is only done when each phpdoc type is compatible with the real signature type.
Warn about @var Type without a variable name in doc comments of function-likes (#2445)
Infer side effects of array_push and array_unshift on complex expressions such as properties. (#2365)
Warn when a non-string is used as a property name for a dynamic property access (#1402)
Don't emit PhanAccessMethodProtected for if ($this instanceof OtherClasslike) { $this->protectedMethod(); } (#2372) (This only applies to uses of the variable $this, e.g. in closures or when checking interfaces)

Plugins:

Warn about unspecialized array types of elements in UnknownElementTypePlugin. mixed[] can be used when absolutely nothing is known about the array's key or value types.
Warn about failing to use the return value of var_export($value, true) (and print_r) in UseReturnValuePlugin (#2391)
Fix plugin causing InvalidVariableIssetPlugin to go into an infinite loop for isset(self::CONST['offset']) (#2446)

Maintenance

Limit frames of stack traces in crash reports to 1000 bytes of encoded data. (#2444)
Support analysis of the upcoming php 7.4 ??= operator (#2369)
Add a target_php_version option for PHP 7.4. This only affects inferred function signatures, and does not allow parsing newer syntax.

Bug fixes:

Fix a crash seen when parsing return typehint for Closure in a different case (e.g. closure) (#2438)
Fix an issue loading the autoloader multiple times when the vendor folder is not lowercase on case-sensitive filesystems (#2440)
Fix bug causing template types on methods to not work properly when inherited from a trait method.
Catch and warn when declaring a constant that would conflict with built in keywords (true/false/null) and prevent it from affecting inferences. (#1642)

10 Feb 2019, Phan 1.2.3

New features(CLI):

Add -I <file_list> as an alias of --include-analysis-file-list <file>.
Support repeating the include option (-I <file_or_list> -I <file_or_list>) and the exclude option (-3 <file_or_list> -3 <file_or_list>).

New features(Analysis):

Inherit more specific phpdoc types even when there are real types in the signature. (#2409) e.g. inherit @param array<int,\stdClass> and @return MyClass[] from the ancestor class of function someMethod(array $x) : array {}.

This is only done when each phpdoc type is compatible with the real signature type.
Detect more expressions without side effects: PhanNoopEmpty and PhanNoopIsset (for isset(expr) and empty(expr)) (#2389)
Also emit PhanNoopBinaryOperator for the ??, ||, and && operators, but only when the result is unused and the right-hand side has no obvious side effects. (#2389)
Properly analyze effects of a property/field access expression as the key of a foreach statement. (#1601)
Emit PhanTypeInstantiateTrait when calling new TraitName() (#2379)
Emit PhanTemplateTypeConstant when using @var T on a class constant's doc comment. (#2402)
Warn for invalid operands of a wider variety of binary operators (/, /=, >>, <<=, -, %, **, etc) (#2410) New issue types: PhanTypeInvalidRightOperandOfIntegerOp and PhanTypeInvalidLeftOperandOfIntegerOp. Also, mention the operator name in the issue message.

Language Server/Daemon mode:

Attempted fixes for bugs with issue filtering in the language server on Windows.
Add --language-server-disable-output-filter, which disables the language server filter to limit outputted issues to those in files currently open in the IDE.

Maintenance

Don't emit a warning to stderr when --language-server-completion-vscode is used.
Catch the rare RecursionDepthException in more places, improve readability of its exception message. (#2386)
Warn that php-ast 1.0.0 and older always crash with PHP 7.4-dev or newer.

Bug fixes:

Fix edge cases in checking if properties/methods are accessible from a trait (#2371)
Fix edge cases checking for PhanTypeInstantiateInterface and PhanTypeInstantiateAbstract (#2379)

Plugins:

Infer a literal string return value when calling sprintf on known literal scalar types in PrintfCheckerPlugin. (#2131)
Infer that ;@foo(); is not a usage of foo() in UseReturnValuePlugin. (#2412)
Implement NotFullyQualifiedUsagePlugin to warn about uses of global functions and constants that aren't fully qualified. (#857)

02 Feb 2019, Phan 1.2.2

New features(CLI):

Emit a warning to stderr if no files were parsed when Phan is invoked. (#2289)

New features(Analysis):

Add @phan-extends and @extends as an alias of @inherits (#2351)
Make checks such as $x !== 'a literal' (and !=) remove the literal string/int type from the union type. (#1789)

Language Server/Daemon mode:

Limit analysis results of the language server to only the currently open files. (#1722)
Limit analysis results of Phan daemon to just the requested files in all output formats (#2374) (not just when phan_client post-processes the output)
Make code completion immediately after typing -> and :: behave more consistently (#2343) Note: this fix only applies at the very last character of a line
Be more consistent about including types in hover text for properties (#2348)
Make "Go to Definition" on new MyClass go to MyClass::__construct if it exists. (#2276)
Support "Go to Definition" for references to global functions and global constants in comments and literal strings. Previously, Phan would only look for class definitions in comments and literal strings.
Fix a crash requesting completion results for some class names/global constants.

Maintenance:

Warn and exit immediately if any plugins are missing or invalid (instead of crashing after parsing all files) (#2099)
Emit warnings to stderr if any config settings seem to be the wrong type (#2376)
Standardize on logging to stderr.
Add more details about the call that crashed to the crash report.

Bug fixes:

Emit a warning and exit if --config-file <file> does not exist (#2271)
Fix inferences about foreach ($arr as [[$nested]]) {...} (#2362)
Properly analyze accesses of @internal elements of the root namespace from other parts of the root namespace. (#2366)
Consistently emit UseNormalNoEffect (etc.) when using names/functions/constants of the global scrope from the global scope.
Fix a bug causing incorrect warnings due to uses of global/class constants.

Plugins:

Add UseReturnValuePlugin, which will warn about code that calls a function/method such as sprintf or array_merge without using the return value.

The list it uses is not comprehensive; it is a small subset of commonly used functions.

This plugin can also be configured to automatically warn about failing to use a return value of any user-defined or internal function-like, when over 98% of the other calls in the codebase did use the return value.

18 Jan 2019, Phan 1.2.1

New features(CLI):

Add short flags: -S for --strict-type-checking, -C for --color, -P for --plugin <plugin>

New features(Analysis):

Infer that the result of array_map has integer keys when passed two or more arrays (#2277)
Improve inferences about the left-hand side of && statements such as $leftVar && (other_expression); (#2300)
Warn about passing an undefined variable to a function expecting a reference parameter with a real, non-nullable type (#1344)
Include variables in scope as alternative suggestions for undeclared properties (#1680)
Infer a string literal when analyzing calls to basename or dirname on an expression that evaluates to a string literal. (#2323)
Be stricter about warning when literal int/string values are passed to incompatible scalar types when scalar_implicit_cast or scalar_implicit_partial are used. (#2340)

Maintenance:

End the output for --output-mode <json> with a newline.
Upgrade tolerant-php-parser, making the polyfill/fallback properly parse $a && $b = $c (#2180)
Add updates to the function/method signature map from Psalm and PHPStan.

Language Server/Daemon mode:

Add --output-mode <mode> to phan_client. (#1568)

Supported formats: phan_client (default), text, json, csv, codeclimate, checkstyle, or pylint
Add --color to phan_client (e.g. for use with --output-mode text)
Add --language-server-completion-vscode. This is a workaround to make completion of variables and static properties work in the Phan plugin for VS Code
Include Phan's signature types in hover text for internal and user-defined methods (instead of just the real types) (#2309) Also, show defaults of non-nullable parameters as = default instead of = null
Properly return a result set when requesting variable completion of $ followed by nothing.
Fix code completion when --language-server-analyze-only-on-save is on. (#2327)

Plugins:

Add a new issue type to DuplicateExpressionPlugin: PhanPluginBothLiteralsBinaryOp. (#2297)

(warns about suspicious expressions such as null == 'a literal in $x ?? null == 'a literal')
Support assertInternalType in PHPUnitAssertionPlugin (#2290)
Warn when identical dynamic expressions (e.g. variables, function calls) are used as array keys in DuplicateArrayKeyPlugin
Allow plugins to include a Suggestion when calling $this->emitIssue()

05 Jan 2019, Phan 1.2.0

New features(Analysis):

Infer match keys of $matches for a wider range of regexes (e.g. non-capturing groups, named subgroups) (#2294)
Improve detection of invalid arguments in code implicitly calling __invoke.
Support extracting template types from more forms of callable types. (#2264)
Support @phan-assert, @phan-assert-true-condition, and @phan-assert-false-condition. Examples of side effects when this annotation is used on a function/method declaration:
- @phan-assert int $x will assert that the argument to the parameter $x is of type int.
- @phan-assert !false $x will assert that the argument to the parameter $x is not false.
- @phan-assert !\Traversable $x will assert that the argument to the parameter $x is not Traversable (or a subclass)
- @phan-assert-true-condition $x will make Phan infer that the argument to parameter $x is truthy if the function returned successfully.
- @phan-assert-false-condition $x will make Phan infer that the argument to parameter $x is falsey if the function returned successfully.
- This can be used in combination with Phan's template support.
See tests/plugin_test/src/072_custom_assertions.php for example uses of these annotations.
Suggest typo fixes when emitting PhanUnusedVariable, if only one definition was seen. (#2281)
Infer that new $x is of the template type T if $x is class-string<T> (#2257)

Plugins:

Add PHPUnitAssertionPlugin. This plugin will make Phan infer side effects of some of the helper methods PHPUnit provides within test cases.
- Infer that a condition is truthy from assertTrue() and assertNotFalse() (e.g. assertTrue($x instanceof MyClass))
- Infer that a condition is null/not null from assertNull() and assertNotNull()
- Infer class type of $actual from assertInstanceOf(MyClass::class, $actual)
- Infer that $actual has the exact type of $expected after calling assertSame($expected, $actual)
- Other methods aren't supported yet.

Bug fixes:

Infer that some internal classes' properties (such as \Exception->message) are protected (#2283)
Fix a crash running Phan without php-ast when no files were parsed (#2287)

30 Dec 2018, Phan 1.1.10

New features(Analysis):

Add suggestions if to PhanUndeclaredConstant issue messages about undeclared global constants, if possible. (#2240) Suggestions include other global constants, variables, class constants, properties, and function names.
Warn about continue and break with no matching loop/switch scope. (#1869) New issue types: PhanContinueOrBreakTooManyLevels, PhanContinueOrBreakNotInLoop
Warn about continue statements targeting switch control structures (doing the same thing as a break) (#1869) New issue types: PhanContinueTargetingSwitch
Support inferring template types from array keys. int/string/mixed can be inferred from array<TKey,\someType> when @template TKey is in the class/function-like scope.
Phan can now infer template types from even more categories of parameter types in constructors and regular functions/methods. (#522)
- infer T from Closure(T):\OtherClass and callable(T):\OtherClass
- infer T from array{keyName:T}
- infer TKey from array<TKey,\OtherClass> (as int, string, or mixed)

Bug fixes:

Refactor the way @template annotations are parsed on classes and function-likes to avoid various edge cases (#2253)
Fix a bug causing Phan to fail to analyze closures/uses of closures when used inline (e.g. in function calls)

27 Dec 2018, Phan 1.1.9

New features(Analysis):

Warn about split and other functions that were removed in PHP 7.0 by default. (#2235, #2236) (target_php_version can now be set to '5.6' if you have a PHP 5.6 project that uses those)
Fix a false positive PhanUnreferencedConstant seen when calling define() with a dynamic name. (#2245)
Support analyzing @template in PHPDoc of closures, functions and methods. (#522)

Phan currently requires the template type to be part of the parameter type(s) as well as the return type.

New issue types: PhanTemplateTypeNotUsedInFunctionReturn, PhanTemplateTypeNotDeclaredInFunctionParams
Make @template on classes behave more consistently. (#522)

Phan will now check the union types of parameters instead of assuming that arguments will always occur in the same order and positions as @template.
Phan can now infer template types from more categories of parameter types in constructors and regular functions/methods. (#522)
- @param T[]
- @param Closure():T
- @param OtherClass<\stdClass,T>
- Note that this implementation is currently incomplete - Phan is not yet able to extract T from types not mentioned here (e.g. array{0:T}, Generator<T>, etc.)
Add callable-string and class-string types. (#1346) Warn if an invalid/undefined callable/class name is passed to parameters declared with those exact types.
Infer a more accurate literal string for the ::class constant.

Additionally, support inferring that a function/method will return instances of the passed in class name, when code has PHPDoc such as the following:
```
/**
 * @template T
 * @param class-string<T> $className
 * @return T
 */
```

Plugins:

Detect more possible duplicates in DuplicateArrayKeyPlugin

Language Server/Daemon mode:

Be more consistent about how return types in methods (of files that aren't open) are inferred.

Bug fixes:

Fix a bug parsing the CLI option --target-php-version major.minor (Phan will now correctly set the target_php_version config setting)
Fix type inferences of $x['offset'] = expr in a branch, when outside of that branch. (#2241)

15 Dec 2018, Phan 1.1.8

New features(Analysis):

Infer more accurate types for return values/expected arguments of methods of template classes.
Support template types in magic methods and properties. (#776, related to #497)
Emit PhanUndeclaredMagicConstant when using a magic constant in a scope that doesn't make sense. Infer more accurate literal strings for some magic constants.

Bug fixes:

Fix a crash when an empty scalar value was passed to a function with variadic arguments (#2232)

08 Dec 2018, Phan 1.1.7

Maintenance:

Improve checks for empty/invalid FQSENs. Also, replace PhanTypeExpectedObjectOrClassNameInvalidName with PhanEmptyFQSENInClasslike or PhanInvalidFQSENInClasslike.

Bug fixes:

Fix uncaught crash on startup analyzing class OCI-Lob from oci8 (#2222)

08 Dec 2018, Phan 1.1.6

New features(Analysis):

Add suggestions to PhanUndeclaredFunction for functions in other namespaces and similarly named functions in the same namespace.
Add issue types PhanInvalidFQSENInCallable and PhanInvalidFQSENInClasslike
Properly analyze closures generated by Closure::fromCallable() on a method.
Emit PhanDeprecatedCaseInsensitiveDefine when define is used to create case-insensitive constants (#2213)

Maintenance:

Increase the default of the config setting suggestion_check_limit from 50 to 1000.
Shorten help messages for phan --init (#2162)

Plugins:

Add a prototype tool tool/dump_markdown_preview, which can be used to preview what description text Phan parses from a doc comment (similar to the language server's hover text)

Bug fixes:

Infer more accurate types after asserting !empty($x)
Fix a crash seen when analyzing anonymous class with 0 args when checking if PhanInfiniteRecursion should be emitted (#2206)
Fix a bug causing Phan to fail to warn about nullable phpdoc types replacing non-nullable param/return types in the real signature.
Infer the correct type for the result of the unary + operator. Improve inferences when +/- operators are used on string literals.
Fix name inferred for global constants define()d within a namespace (#2207). This now properly treats the constant name as being fully qualified.
Don't emit PhanParamSignatureRealMismatchReturnType for a return type of T replacing ?T, or for array replacing iterable (#2211)

29 Nov 2018, Phan 1.1.5

Language Server:

Fix a crash in the Language Server when pcntl is not installed or enabled (e.g. on Windows) (#2186)

27 Nov 2018, Phan 1.1.4

New features(Analysis):

Preserve original descendent object types after type assertions, when original object types are all subtypes (e.g. infer SubClass for $x = rand(0,1) ? new SubClass() : false; if ($x instanceof BaseClass) { ... })

Maintenance:

Emit UnusedPluginSuppression on @phan-suppress-next-line and @phan-file-suppress on the same line as the comment declaring the suppression. (#2167, #1731)
Don't emit PhanInvalidCommentForDeclarationType (or attempt to parse) unknown tags that have known tags as prefixes (#2156) (e.g. @param-some-unknown-tag)

Bug fixes:

Fix a crash when analyzing a nullable parameter of type self in traits (#2163)
Properly parse closures/generic arrays/array shapes when inner types also contain commas (#2141)
Support matching parentheses inside closure params, recursively. (e.g. Closure(int[],Closure(int):bool):int[])
Don't warn about properties being read-only when they might be modified by reference (#1729)

20 Nov 2018, Phan 1.1.3

New features(CLI):

Warn when calling method on union types that are definitely partially invalid. (#1885) New config setting: --strict-method-checking (enabled as part of --strict-type-checking) New issue type: PhanPossiblyNonClassMethodCall
Add a prototype tool tool/phoogle, which can be used to search for function/method signatures in user-declared and internal functions/methods. E.g. to look for functions that return a string, given a string and an array: /path/phan/tool/phoogle 'string -> array -> string

New features(Analysis):

Add a heuristic check to detect potential infinite recursion in a functionlike calling itself (i.e. stack overflows) New issue types: PhanInfiniteRecursion
Infer literal integer values from expressions such as 2 | 1, 2 + 2, etc.
Infer more accurate array shapes for preg_match_all (based on existing inferences for preg_match)
Make Phan infer union types of variables from switch statements on variables (#1291) (including literal int and string types)
Analyze simple assertions on get_class($var) of various forms (#1977) Examples:
- assert(get_class($x) === 'someClass')
- if (get_class($x) === someClass::class)
- switch (get_class($x)) {case someClass::class: ...}
Warn about invalid/possibly invalid callables in function calls. New issue types: PhanTypeInvalidCallable, PhanTypePossiblyInvalidCallable (the latter check requires --strict-method-checking)
Reduce false positives for a few functions (such as substr) in strict mode.
Make Phan infer that variables are not null/false from various comparison expressions, e.g. assert($x > 0);
Detect invalid arguments to ++/-- operators (#680). Improve the analysis of the side effects of ++/-- operators. New issue type: PhanTypeInvalidUnaryOperandIncOrDec

Plugins:

Add BeforeAnalyzeCapability, which will be executed once before starting the analysis phase. (#2086)

Bug fixes:

Fix false positives analyzing define() (#2128)
Support declaring instance properties as the union type static (#2145) New issue types: PhanStaticPropIsStaticType
Fix a crash seen when Phan attempted to emit PhanTypeArrayOperator for certain operations (#2153)

05 Nov 2018, Phan 1.1.2

New features(CLI):

Make phan --progress-bar fit within narrower console widths. (#2096) (Make the old width into the new maximum width) Additionally, use a gradient of shades for the progress bar.

New features(Analysis):

Warn when attempting to read from a write-only real/magic property (or vice-versa) (#595)

New issue types: PhanAccessReadOnlyProperty, PhanAccessReadOnlyMagicProperty, PhanAccessWriteOnlyProperty, PhanAccessWriteOnlyMagicProperty

New annotations: @phan-read-only and @phan-write-only (on its own line) in the doc comment of a real property.
Warn about use statements that are redundant. (#2048)

New issue types: PhanUseConstantNoEffect, PhanUseFunctionNoEffect, PhanUseNormalNamespacedNoEffect, PhanUseNormalNoEffect

By default, this will only warn about use statements made from the global namespace, of elements also in the global namespace. To also warn about redundant namespaced uses of classes/namespaces (e.g. namespace Foo; use Foo\MyClass;), enable warn_about_redundant_use_namespaced_class
Warn when using a trait as a real param/return type of a method-like (#2007) New issue types: PhanTypeInvalidTraitParam, PhanTypeInvalidTraitReturn
Improve the polyfill/fallback parser's heredoc and nowdoc lexing (#1537)
Properly warn about an undefined variable being passed to array_shift (it expects an array but undefined is converted to null) (related to fix for #2100)
Stop adding generic int/string to the type of a class property when the doc comment mentions only literal int/string values (#2102) (e.g. @var 1|2)
Improve line number of warning about extra comma in arrays (i.e. empty array elements). (#2066)
Properly parse flexible heredoc/nowdoc syntaxes that were added in PHP 7.3 (#1537)
Warn about more invalid operands of the binary operators ^,/,& (#1825) Also, fix cases where PhanTypeArrayOperator would not be emitted. New issue types: PhanTypeInvalidBitwiseBinaryOperator, PhanTypeMismatchBitwiseBinaryOperands
Indicate when warnings about too many arguments are caused only by argument unpacking. (#1324) New issue types: PhanParamTooManyUnpack, PhanParamTooManyUnpackInternal
Properly warn about undefined namespaced constants/functions from within a namespace (#2112) Phan was failing to warn in some cases.
Always infer int for << and >>
Support using dynamic values as the name for a define() statement (#2116)

Maintenance:

Make issue messages more consistent in their syntax used to describe closures/functions (#1695)
Consistently refer to instance properties as Class->propname and static properties as Class::$staticpropname in issue messages.

Bug fixes:

Properly type check static::someMethodName(). Previously, Phan would fail to infer types for the results of those method calls.
Improve handling of array_shift. Don't warn when it's used on a global or superglobal (#2100)
Infer that self and static in a trait refer to the methods of that trait. (#2006)

22 Oct 2018, Phan 1.1.1

New features(Analysis):

Add defined at {FILE}:{LINE} to warnings about property visibility.
Warn about missing references (\n or $n) in the replacement template string of preg_replace() (#2047)
Make @suppress on closures/functions/methods apply more consistently to issues emitted when analyzing the closure/function/method declaration. (#2071)
Make @suppress on warnings about unparseable doc comments work as expected (e.g. for PhanInvalidCommentForDeclarationType on a class) (#1429)
Support checking for missing/invalid files in require/include/require_once/include_once statements.

To enable these checks, set enable_include_path_checks to true in your Phan config.

New issue types: PhanRelativePathUsed, PhanTypeInvalidEval, PhanTypeInvalidRequire, PhanInvalidRequireFile, PhanMissingRequireFile

New config settings: enable_include_path_checks, include_paths, warn_about_relative_include_statement
Warn when attempting to unset a property that was declared (i.e. not a dynamic or magic property) (#569) New issue type: PhanTypeObjectUnsetDeclaredProperty
- This warning is emitted because declared properties are commonly expected to exist when they are accessed.
Warn about iterating over an object that's not a Traversable and not stdClass (#1115) New issue types (for those objects) were added for the following cases:
1. Has no declared properties (TypeNoPropertiesForeach)
2. Has properties and none are accessible. (TypeNoAccessiblePropertiesForeach)
3. Has properties and some are accessible. (TypeSuspiciousNonTraversableForeach)
Add @phan-template and @phan-inherits as aliases for @template and @inherits (#2063)
Warn about passing non-objects to clone() (PhanTypeInvalidCloneNotObject) (#1798)

Maintenance:

Minor performance improvements.
Increase the default value of max_literal_string_type_length from 50 to 200.
Include Phan version in Phan's error handler and exception handler output. (#1639)

Bug fixes:

Don't crash when parsing an invalid cast expression. Only the fallback/polyfill parsers were affected.

Language Server/Daemon mode:

Fix bugs in the language server.
1. The language server was previously using the non-PCNTL fallback implementation unconditionally due to an incorrect default configuration value. After this fix, the language server properly uses PCNTL by default if PCNTL is available.
  
  This bug was introduced by PR #1743
2. Fix a bug causing the language server to eventually run out of memory when PCNTL was disabled.

08 Oct 2018, Phan 1.1.0

Maintenance:

Work on making this compatible with php-ast 1.0.0dev. (#2038) (Phan continues to support php-ast 0.1.5 and newer)

Remove dead code (such as helper functions and references to constants) that aren't needed when using AST version 50 (which Phan uses).

Some plugins may be affected if they call these helper methods or use those constants when the shim is used.

Bug fixes:

Fix a crash parsing an empty shell_exec shorthand string when using the fallback parser (i.e. two backticks in a row)
Fix a false positive PhanUnusedVariable warning about a variable declared prior to a do/while loop (#2026)

02 Oct 2018, Phan 1.0.7

New features(Analysis):

Support the (int|string)[] syntax of union types (union of multiple types converted to an array) in PHPDoc (#2008)

e.g. @param (int|string)[] $paramName, @return (int|string)[]
Support spaces after commas in array shapes (#1966)
Emit warnings when using non-strings as dynamic method names (e.g. $o->{$notAString}()) New issue types: PhanTypeInvalidMethodName, PhanTypeInvalidStaticMethodName, PhanTypeInvalidCallableMethodName

Plugins:

In HasPHPDocPlugin, use a more compact representation to show what Phan sees from the raw doc comment.
In HasPHPDocPlugin, warn about global functions without extractable PHPDoc summaries.

New issue types: PhanPluginNoCommentOnFunction, PhanPluginDescriptionlessCommentOnFunction
In HasPHPDocPlugin, warn about methods without extractable PHPDoc summaries.

New issue types: PhanPluginNoCommentOn*Method, PhanPluginDescriptionlessCommentOn*Method

These can be suppressed based on the method FQSEN with plugin_config => [..., 'has_phpdoc_method_ignore_regex' => (a PCRE regex)] (e.g. to suppress issues about tests, or about missing documentation about getters and setters, etc.)

Bug fixes:

Fix false positive PhanUnusedVariable for variables declared before break/continue that are used after the loop. (#1985)
Properly emit PhanUnusedVariable for variables where definitions are shadowed by definitions in branches and/or loops. (#2012)
Properly emit PhanUnusedVariable for variables which are redefined in a 'do while' loop.
Be more consistent about emitting PhanUnusedVariableCaughtException when exception variable names are reused later on.
Fix a crash when parsing @method annotations with many parameters (#2019)

25 Sep 2018, Phan 1.0.6

New features(Analysis):

Be more consistent about warning about undeclared properties in some edge cases. New issue types: PhanUndeclaredClassProperty, PhanUndeclaredClassStaticProperty

Maintenance:

Restore test files in future published releases' git tags (#1986) (But exclude them from the zip/tar archives published on GitHub Releases)
- When --prefer-dist (the default) is used in composer to download a stable release, the test files will not be part of the downloaded files.

Language Server/Daemon mode:

Add support for code completion suggestions. (#1706)

This can be enabled by passing --language-server-enable-completion

This will complete references to the following element types:
- variable names (using superglobals and local variables that have been declared in the scope)
- global constants, global functions, and class names.
- class constants, instance and static properties, and instance and static method names.
NOTE: If you are completing from the empty string (e.g. immediately after -> or ::), Phan may interpret the next word token (e.g. on the next line) as the property/constant name/etc. to complete, due to the nature of the parser used (The cursor position doesn't affect the parsing logic).
- Completion requests before tokens that can't be treated that way will not cause that problem. (such as }, ;, ), the end of the file, etc.)

Bug fixes:

Fix various uncaught errors in Phan that occurred when parsing invalid ASTs. Instead of crashing, warn about the bug or invalid AST.

New issue types: PhanInvalidConstantFQSEN, PhanContextNotObjectUsingSelf, PhanInvalidTraitUse (for unparsable trait uses)

21 Sep 2018, Phan 1.0.5

New Features(Analysis)

Warn if a PHPDoc annotation for an element(@param, @method, or @property*) is repeated. (#1963)

New issue types: PhanCommentDuplicateMagicMethod, PhanCommentDuplicateMagicProperty, PhanCommentDuplicateParam
Add basic support for extract() (#1978)
Improve line numbers for warnings about @param and @return annotations (#1369)

Maintenance:

Make ext-ast a suggested composer dependency instead of a required composer dependency (#1981)

--use-fallback-parser allows Phan to analyze files even when php-ast is not installed or enabled.
Remove test files from future published releases (#1982)

Plugins:

Properly warn about code after break and continue in UnreachableCodePlugin. Previously, Phan only warned about code after throw and return.

Bug fixes:

Don't infer bad types for variables when analyzing array_push using expressions containing those variables. (#1955)

(also fixes other array_* functions taking references)
Fix false negatives in PHP5 backwards compatibility heuristic checks (#1939)
Fix false positive PhanUnanalyzableInheritance for a method inherited from a trait (which itself uses trait) (#1968)
Fix an uncaught RuntimeException when type checking an array that was roughly 12 or more levels deep (#1962)
Improve checks of the return type of magic methods against methods inherited from ancestor classes (#1975)

Don't emit a false positive PhanParamSignaturePHPDocMismatchReturnType

Language Server/Daemon mode:

Fix an uncaught exception when extracting a URL with an unexpected scheme (not file:/...) (#1960)
Fix false positive PhanUnreferencedUseNormal issues seen when the daemon was running without pcntl (#1860)

10 Sep 2018, Phan 1.0.4

Plugins:

Fix a crash in DuplicateExpressionPlugin.
Add HasPHPDocPlugin, which checks if an element (class or property) has a PHPDoc comment, and that Phan can extract a plaintext summary/description from that comment.

Language Server/Daemon mode:

Support generating a hover description for variables.
- For union types with a single non-nullable class/interface type, the hover text include the full summary description of that class-like.
- For non-empty union types, this will just show the raw union type (e.g. string|false)
Improve extraction of summaries of elements (e.g. hover description)
- Support using @return as a summary for function-likes.
- Parse the lines after @var tag (before subsequent tags) as an additional part of the summary for constants/properties.

Maintenance:

Update Phar file to contain missing LICENSEs (#1950)
Add more documentation to Phan's code.

07 Sep 2018, Phan 1.0.3

Bug fixes

Fix bugs in analysis of assignments within conditionals (#1937)
Fix a crash analyzing comparison with variable assignment expression (#1940) (e.g. if (1 + 1 > ($var = 1)))

Plugins:

Update SleepCheckerPlugin to warn about properties that aren't returned in __sleep() that don't have a doc comment annotation of @phan-transient or @transient. (This is not an officially specified annotation)

New issue type: SleepCheckerPropertyMissingTransient

New setting: $config['plugin_config']['sleep_transient_warning_blacklist_regex'] can be used to prevent Phan from warning about certain properties missing @phan-transient

06 Sep 2018, Phan 1.0.2

New features(Analysis)

Allow spaces on either side of | in union types (e.g. @param array | ArrayAccess $x)
Warn about array destructuring assignments from non-arrays (#1818) (E.g. [$x] = 2)

New issue type: PhanTypeInvalidExpressionArrayDestructuring
Infer the number of groups for $matches in preg_match()

Named subpatterns, non-capturing patterns, and regular expression options are not supported yet. Phan will just infer a more generic type such as string[] (depending on the bit flags).
Warn about ambiguous uses of Closure():void in phpdoc. Also, make that syntax count as a reference to use Closure; in that namespace.
Track the line number of magic method and magic properties (Instead of reporting the line number of the class).

Bug fixes

Fix a crash seen when using a temporary expression in a write context. (#1915)

New issue type: PhanInvalidWriteToTemporaryExpression
Fix a crash seen with --use-fallback-parser with an invalid expression after new
Properly infer that closures have a class name of Closure for some issue types. (e.g. call_user_func([function() {}, 'invalidMethod']))
Fix a bug analyzing nested assignment in conditionals (#1919)
Don't include impossible types when analyzing assertions such as is_string($var) (#1932)

26 Aug 2018, Phan 1.0.1

New features(CLI,Configs)

Support setting a target_php_version of PHP 7.3 in the config file or through --target-php-version.
Assume that __construct, __destruct, __set, __get, __unset, __clone, and __wakeup have return types of void if unspecified.

New features(Analysis)

Add function signatures for functions added/modified in PHP 7.3. (#1537)
Improve the line number for warnings about unextractable @property* annotations.
Make Phan aware that $x is not false inside of loops such as while ($x = dynamic_value()) {...} (#1646)
Improve inferred types of $x in complex equality/inequality checks such as if (($x = dynamic_value()) !== false) {...}
Make !is_numeric assertions remove int and float from the union type of an expression. (#1895)
Preserve any matching original types in scalar type assertions (#1896) (e.g. a variable $x of type ?int|?MyClass will have type int after assert(is_numeric($x)))

Maintenance:

Add/modify various function, methods, and property type signatures.

Plugins:

Add UnknownElementTypePlugin to warn about functions/methods that have param/return types that Phan can't infer anything about. (it can still infer some things in non-quick mode about parameters)

New issue types: PhanPluginUnknownMethodReturnType, PhanPluginUnknownClosureReturnType, PhanPluginUnknownFunctionReturnType, PhanPluginUnknownPropertyType
Add DuplicateExpressionPlugin to warn about duplicated expressions such as:
- X == X, X || X, and many other binary operators (for operators where it is likely to be a bug)
- X ? X : Y (can often simplify to X ?: Y)
- isset(X) ? X : Y (can simplify to ?? in PHP 7)
New issue types: PhanPluginDuplicateExpressionBinaryOp, PhanPluginDuplicateConditionalTernaryOperation, PhanPluginDuplicateConditionalNullCoalescing
Improve types inferred for $matches for PregRegexCheckerPlugin.

Bug fixes:

Properly handle CompileError (that are not the subclass ParseError). CompileError was added in PHP 7.3. (Phan now logs these the same way it would log other syntax errors, instead of treating this like an unexpected Error.)
Make sure that private methods that are generators, that are inherited from a trait, aren't treated like a void.
Fix a crash analyzing a dynamic call to a static method, which occurred when dead code detection or reference tracking was enabled. (#1889)
Don't accidentally emit false positive issues about operands of binary operators in certain contexts. (#1898)

12 Aug 2018, Phan 1.0.0

The Phan 1.0.0 release supports analysis of php 7.0-7.2, and can be executed with php 7.0+. This release replaces the previous 0.12.x releases. Because Phan uses PHP's Reflection APIs, it's recommended to use the same PHP minor version for analyzing the code as would be used to run the code. (For the small number of function/method signatures, etc., that were added or changed in each minor release of PHP.)

Plugins:

Plugins: Remove V1 plugins (and V1 plugin examples), as well as legacy plugin capabilities. (#249) Third party plugin authors must use V2 of the plugin system.

Removed capabilities:
- AnalyzeNodeCapability, LegacyAnalyzeNodeCapability, LegacyPostAnalyzeNodeCapability (use PostAnalyzeNodeCapability instead)
- LegacyPreAnalyzeNodeCapability (use PreAnalyzeNodeCapability instead)
API: Remove various methods that were deprecated. (#249) Any plugins using those methods will need to be updated. (e.g. Config::getValue('config_value') must be used instead of Config::get()->config_value)
Config: Remove progress_bar_sample_rate (#249) (progress_bar_sample_interval must be used instead if you want the progress bar to be faster or slower)
Maintenance: Immediately report the exception and exit if any plugins threw an uncaught Throwable during initialization. (E.g. this results in a better error message when a third party plugin requires PHP 7.1 syntax but PHP 7.0 is used to run Phan)

21 Jul 2018, Phan 0.12.15

New features(Analysis)

Make Phan's unused variable detection also treat exception variables as variable definitions, and warn if the caught exception is unused. (#1810) New issue types: PhanUnusedVariableCaughtException
Be more aggressive about inferring that a method has a void return type, when it is safe to do so
Emit PhanInvalidConstantExpression in some places where PHP would emit "Constant expression contains invalid operations"

Phan will replace the default parameter type (or constant type) with mixed for constants and class constants.

Previously, this could cause Phan to crash, especially with --use-fallback-parser on invalid ASTs.
Improve analysis of arguments passed to implode()

New features(CLI)

Add --daemonize-tcp-host CLI option for specifying the hostname for daemon mode (#1868). The default will remain 127.0.0.1 when not specified. It can be overridden to values such as 0.0.0.0 (publicly accessible, e.g. for usage with Docker)

Language Server/Daemon mode:

Implement support for hover requests in the Language Server (#1738)

This will show a preview of the element definition (showing signature types instead of PHPDoc types) along with the snippet of the element description from the doc comment.

Clients that use this should pass in the CLI option --language-server-enable-hover when starting the language server.
- Note that this implementation assumes that clients sanitize the mix of markdown and HTML before rendering it.
- Note that this may slow down some language server clients if they pause while waiting for the hover request to finish.

Maintenance:

Add a workaround for around a notice in PHP 7.3alpha4 (that Phan treats as fatal) (#1870)

Bug fixes:

Fix a bug in checking if nullable versions of specialized type were compatible with other nullable types. (#1839, #1852) Phan now correctly allows the following type casts:
- ?1 can cast to ?int
- ?'a string' can cast to ?string
- ?Closure(T1):T2 can cast to ?Closure
- ?callable(T1):T2 can cast to ?callable,
Make exclude_file_list work more consistently on Windows.

08 Jul 2018, Phan 0.12.14

New features(CLI, Configs)

Add warn_about_undocumented_throw_statements and exception_classes_with_optional_throws_phpdoc config. (#90)

If warn_about_undocumented_throw_statements is true, Phan will warn about uncaught throw statements that aren't documented in the function's PHPDoc. (excluding classes listed in exception_classes_with_optional_throws_phpdoc and their subclasses) This does not yet check function and method calls within the checked function that may themselves throw.

Add warn_about_undocumented_exceptions_thrown_by_invoked_functions. If enabled (and warn_about_undocumented_throw_statements is enabled), Phan will warn about function/closure/method invocations that have @throws that aren't caught or documented in the invoking method. New issue types: PhanThrowTypeAbsent, PhanThrowTypeAbsentForCall, PhanThrowTypeMismatch, PhanThrowTypeMismatchForCall

Add exception_classes_with_optional_throws_phpdoc config. Phan will not warn about lack of documentation of @throws for any of the configured classes or their subclasses. The default is the empty array (Don't suppress any warnings.) (E.g. Phan suppresses ['RuntimeException', 'AssertionError', 'TypeError'] for self-analysis)

New Features (Analysis):

Warn when string literals refer to invalid class names (E.g. $myClass::SOME_CONSTANT). (#1794) New issue types: PhanTypeExpectedObjectOrClassNameInvalidName (emitted if the name can't be used as a class) This will also emit PhanUndeclaredClass if the class name could not be found.
Make Phan aware that $this doesn't exist in a static closure (#768)

Language Server/Daemon mode:

Fix another rare bug that can cause crashes in the polyfill/fallback parser when parsing invalid or incomplete ASTs.
Add a --language-server-hide-category setting to hide the issue category from diagnostic messages.
Remove the numeric diagnostic code from the language server diagnostics (a.k.a. issues). (Certain language clients such as LanguageClient-neovim would render that the code in the quickfix menu, wasting space)
Support "go to definition" for union types within all code comment types (#1704) (e.g. can go to definition in // some annotation or comment mentioning MyType)

New features(Analysis)

Support analysis of list() reference assignment for php 7.3 (which is still in alpha). (#1537)
Warn about invalid operands of the unary operators +, -, and ~ New issue types: PhanTypeInvalidUnaryOperandNumeric and PhanTypeInvalidUnaryOperandBitwiseNot (#680)

Bug fixes:

Fix a bug causing Phan to infer extra wrong types (ancestorClass[][]) for @return className[] (#1822)
Start warning about assignment operations (e.g. +=) when the modified variable isn't referenced later in the function.
Make exceptions in catch{} always include the type Throwable even if the declared type doesn't. (#336)

16 Jun 2018, Phan 0.12.13

New features(Analysis)

Support integer literals both in PHPDoc and in Phan's type system. (E.g. @return -1|string) Include integer values in issue messages if the values are known.
Support string literals both in PHPDoc and in Phan's type system. (E.g. @return 'example\n') Phan can now infer possible variable values for dynamic function/method calls, etc.

Note: By default, Phan does not store representations of strings longer than 50 characters. This can be increased with the 'max_literal_string_type_length' config.

Supported escape codes: \\, \', \r, \n, \t, and hexadecimal (\xXX).
Improve inferred types of unary operators.
Warn about using void/iterable/object in use statements based on target_php_version. (#449) New issue types: PhanCompatibleUseVoidPHP70, PhanCompatibleUseObjectPHP71, PhanCompatibleUseObjectPHP71
Warn about making overrides of inherited property and constants less visible (#788) New issue types: PhanPropertyAccessSignatureMismatch, PhanPropertyAccessSignatureMismatchInternal, PhanConstantAccessSignatureMismatch, PhanConstantAccessSignatureMismatchInternal.
Warn about making static properties into non-static properties (and vice-versa) (#615) New issue types: PhanAccessNonStaticToStaticProperty, PhanAccessStaticToNonStaticProperty
Warn about inheriting from a class/trait/interface that has multiple possible definitions (#773) New issue types: PhanRedefinedExtendedClass, PhanRedefinedUsedTrait, PhanRedefinedInheritedInterface
Infer more accurate types for the side effects of assignment operators (i.e. +=, .=, etc) and other binary operations. (#1775)
Warn about invalid arguments to binary operators or assignment operators. New issue types: PhanTypeInvalidLeftOperandOfAdd, PhanTypeInvalidLeftOperandOfNumericOp, PhanTypeInvalidRightOperandOfAdd, PhanTypeInvalidRightOperandOfNumericOp
Warn about using negative string offsets and multiple catch exceptions in PHP 7.0 (if target_php_version is less than '7.1'). (#1771, #1778) New issue types: PhanCompatibleMultiExceptionCatchPHP70, PhanCompatibleNegativeStringOffset.

Maintenance:

Update signature map with more accurate signatures (#1761)
Upgrade tolerant-php-parser, making the polyfill/fallback able to parse PHP 7.1's multi exception catch.

Bug fixes:

Don't add more generic types to properties with more specific PHPDoc types (#1783). For example, don't add array to a property declared with PHPDoc type /** @var string[] */
Fix uncaught AssertionError when parent is used in PHPDoc (#1758)
Fix various bugs that can cause crashes in the polyfill/fallback parser when parsing invalid or incomplete ASTs.
Fix unparsable/invalid function signature entries of rarely used functions
Warn about undefined variables on the left-hand side of assignment operations (e.g. $x .= 'string') (#1613)

08 Jun 2018, Phan 0.12.12

Maintenance:

Increase the severity of some issues to critical (if they are likely to cause runtime Errors in the latest PHP version).

Bug fixes:

Allow suppressing PhanTypeInvalidThrows* with doc comment suppressions in the phpdoc of a function/method/closure.
Fix crashes when fork pool is used and some issue types are emitted (#1754)
Catch uncaught exception for PhanContextNotObject when calling instanceof self outside a class scope (#1754)

30 May 2018, Phan 0.12.11

Language Server/Daemon mode:

Make the language server work more reliably when pcntl is unavailable. (E.g. on Windows) (#1739)
By default, allow the language server and daemon mode to start with the fallback even if pcntl is unavailable. (--language-server-require-pcntl can be used to make the language server refuse to start without pcntl)

Bug fixes:

Don't crash if ext-tokenizer isn't installed (#1747)
Fix invalid output of tool/make_stubs for APCu (#1745)

27 May 2018, Phan 0.12.10

New features(CLI, Configs)

Add CLI flag --unused-variable-detection.
Add config setting unused_variable_detection (disabled by default). Unused variable detection can be enabled by --unused-variable-detection, --dead-code-detection, or the config.

New features(Analysis):

Add built-in support for unused variable detection. (#345) Currently, this is limited to analyzing inside of functions, methods, and closures. This has some minor false positives with loops and conditional branches.

Warnings about unused parameters can be suppressed by adding @phan-unused-param on the same line as @param, e.g. @param MyClass $x @phan-unused-param. (as well as via standard issue suppression methods.)

The built in unused variable detection support will currently not warn about any of the following issue types, to reduce false positives.
- Variables beginning with $unused or $raii (case-insensitive)
- $_ (the exact variable name)
- Superglobals, used globals (global $myGlobal;), and static variables within function scopes.
- Any references, globals, or static variables in a function scope.
New Issue types:
- PhanUnusedVariable,
- PhanUnusedVariableValueOfForeachWithKey, (has a high false positive rate)
- PhanUnusedPublicMethodParameter, PhanUnusedPublicFinalMethodParameter,
- PhanUnusedProtectedMethodParameter, PhanUnusedProtectedFinalMethodParameter,
- PhanUnusedPrivateMethodParameter, PhanUnusedProtectedFinalMethodParameter,
- PhanUnusedClosureUseVariable, PhanUnusedClosureParameter,
- PhanUnusedGlobalFunctionParameter
This is similar to the third party plugin PhanUnusedVariable. The built-in support has the following changes:
- Emits fewer/different false positives (e.g. when analyzing loops), but also detects fewer potential issues.
- Reimplemented using visitors extensively (Similar to the code for BlockAnalysisVisitor)
- Uses a different data structure from PhanUnusedVariable. This represents all definitions of a variable, instead of just the most recent one. This approximately tracks the full graph of definitions and uses of variables within a function body. (This allows warning about all unused definitions, or about definitions that are hidden by subsequent definitions)
- Integration: This is planned to be integrated with other features of Phan, e.g. "Go to Definition" for variables. (Planned for #1211 and #1705)

Bug fixes:

Minor improvements to UnusedSuppressionPlugin

Misc:

Support composer.json's vendor-dir for phan --init

22 May 2018, Phan 0.12.9

New features(CLI, Configs):

Add CLI flag --language-server-enable-go-to-definition. See the section "Language Server/Daemon mode".
Add Config setting disable_line_based_suppression to disable line-based suppression from internal comments. See the section "New Features"
Add Config setting disable_file_based_suppression to disable file-based issue suppressions.

New features(Analysis):

Make @suppress, @phan-suppress, @phan-file-suppress accept a comma separated issue list of issue types to suppress. (#1715) Spaces aren't allowed before the commas.
Implement @phan-suppress-current-line and @phan-suppress-next-line to suppress issues on the current or next line.

These can occur within any comment or doc comment (i.e. the comment types for /*, //, and /**)

These suppressions accept a comma separated list of issue type names. Commas must be immediately after the previous issue type.

Note: Phan currently does not support inline comments anywhere else. Phan also does not associate these inline comments with any information about the current scope. This suppression is based on tokenizing the PHP file and determining the line based on that comment line.

Examples:
```
// @phan-suppress-next-line PhanUndeclaredVariable, PhanUndeclaredFunction optional reason goes here
$result = call_undefined_function() + $undefined_variable;

$closure();  /* @phan-suppress-current-line PhanParamTooFew optional reason for suppression */

/**
 * This can also be used within doc comments:

 * @phan-suppress-next-line PhanInvalidCommentForDeclarationType optional reason for suppression
 * @property int $x
 */
function my_example() {
}
```
PhanUnusedSuppressionPlugin is capable of detecting if line-based suppressions are unused.
Allow using @phan-file-suppress as a regular comment anywhere within a file (//, /*, or /** comments). Previously, @phan-file-suppress could only be used inside the doc comment of an element.

@phan-file-suppress in no-op string literals will be deprecated in a future Phan release.
Emit class name suggestions for undeclared types in param, property, return type, and thrown type declarations. (#1689)

Affects PhanUndeclaredTypeParameter, PhanUndeclaredTypeProperty, PhanUndeclaredTypeReturnType, PhanUndeclaredTypeThrowsType, and PhanInvalidThrowsIs*
Add pretend_newer_core_methods_exist config setting. If this is set to true (the default), and target_php_version is newer than the version used to run Phan, Phan will act as though functions added in newer PHP versions exist.

Note: Currently only affects Closure::fromCallable(), which was added in PHP 7.1. This setting will affect more functions and methods in the future.

Language Server/Daemon mode:

Support "Go to definition" for properties, classes, global/class constants, and methods/global functions (Issue #1483) (Must pass the CLI option --language-server-enable-go-to-definition when starting the server to enable this)
Support "Go to type definition" for variables, properties, classes, and methods/global functions (Issue #1702) (Must pass the CLI option --language-server-enable-go-to-definition when starting the server to enable this) Note that constants can't have object types in PHP, so there's no implementation of "Go To Type Definition" for those.

Plugins:

Add a new plugin capability SuppressionCapability that allows users to suppress issues in additional ways. (#1070)
Add a new plugin SleepCheckerPlugin. (PR #1696) Warn about returning non-arrays in sleep, as well as about returning array values with invalid property names.

Issue types: SleepCheckerInvalidReturnStatement, SleepCheckerInvalidPropNameType, SleepCheckerInvalidPropName, SleepCheckerMagicPropName, and SleepCheckerDynamicPropName
Make PhanPregRegexCheckerPlugin warn about the /e modifier on regexes (#1692)

Misc:

Add simple integration test for the language server mode.

Bug fixes:

Be more consistent about emitting PhanUndeclaredType* for invalid types within array shapes.
Avoid a crash when the left-hand side of an assignment is invalid. (#1693)
Prevent an uncaught TypeError when integer variable names (e.g. ${42}) are used in branches (Issue #1699)

12 May 2018, Phan 0.12.8

Bug fixes

Fix a crash that occurs when the iterable<[KeyType,]ValueType> annotation is used in phpdoc. (#1685)

08 May 2018, Phan 0.12.7

New features:

For PhanUndeclaredMethod and PhanUndeclaredStaticMethod issues, suggest visible methods (in the same class) with similar names.
For PhanUndeclaredConstant issues (for class constants), suggest visible constants (in the same class) with similar names.
For PhanUndeclaredProperty and PhanUndeclaredStaticProperty issues, suggest visible properties (in the same class) with similar names.
When suggesting alternatives to undeclared classes, also include suggestions for similar class names within the same namespace as the undeclared class. (Comparing Levenshtein distance)

Language Server/Daemon mode

Make the latest version of phan_client include any suggestion alongside the issue message (for daemon mode).
Include text from suggestions in Language Server Protocol output

Bug fixes

Fix a bug generating variable suggestions when there were multiple similar variable names (The suggestions that would show up might not be the best set of suggestions)
Fix a crash in the tolerant-php-parser polyfill seen when typing out an echo statement
Fix incorrect suggestions to use properties (of the same name) instead of undeclared variables in class scopes. (Refer to static properties as self::$name and don't suggest inaccessible inherited private properties)
Don't suggest obviously invalid alternatives to undeclared classes. (E.g. don't suggest traits or interfaces for new MisspelledClass, don't suggest interfaces for static method invocations)

06 May 2018, Phan 0.12.6

New features(Analysis)

Warn about properties that are read but not written to when dead code detection is enabled (Similar to existing warnings about properties that are written to but never read) New issue types: PhanReadOnlyPrivateProperty, PhanReadOnlyProtectedProperty, PhanReadOnlyPublicProperty
When warning about undeclared classes, mention any classes that have the same name (but a different namespace) as suggestions.

E.g. test.php:26 PhanUndeclaredClassInstanceof Checking instanceof against undeclared class \MyNS\InvalidArgumentException (Did you mean class \InvalidArgumentException)
When warning about undeclared variables (outside of the global scope), mention any variables that have similar names (based on case-insensitive Levenshtein distance) as suggestions.

In method scopes: If $myName is undeclared, but $this->myName is declared (or inherited), $this->myName will be one of the suggestions.
Warn about string and numeric literals that are no-ops. (E.g. <?php 'notEchoedStr'; "notEchoed $x"; ?>) New issue types: PhanNoopStringLiteral, PhanNoopEncapsulatedStringLiteral, PhanNoopNumericLiteral.

Note: This will not warn about Phan's inline type checks via string literals
When returning an array literal (with known keys) directly, make Phan infer the array literal's array shape type instead of a combination of generic array types.
Make type casting rules stricter when checking if an array shape can cast to a given generic array type. (E.g. array{a:string,b:int} can no longer cast to array<string,int>, but can cast to array<string,int>|array<string,string>).

E.g. Phan will now warn about /** @return array<string,int> */ function example() { $result = ['a' => 'x', 'b' => 2]; return $result; }
Warn about invalid expressions/variables encapsulated within double-quoted strings or within heredoc strings. New issue type: TypeSuspiciousStringExpression (May also emit TypeConversionFromArray)
Add support for template params in iterable types in phpdoc. (#824) Phan supports iterable<TValue> and iterable<TKey, TValue> syntaxes. (Where TKey and TValue are union types) Phan will check that generic arrays and array shapes can cast to iterable template types.
Add support for template syntax of Generator types in phpdoc. (#824) Supported syntaxes are:
1. \Generator<TValue>
2. \Generator<TKey,TValue>
3. \Generator<TKey,TValue,TSend> (TSend is the expected type of $x in $x = yield;)
4. \Generator<TKey,TValue,TSend,TReturn> (TReturn is the expected type of expr in return expr)
New issue types: PhanTypeMismatchGeneratorYieldValue, PhanTypeMismatchGeneratorYieldKey (For comparing yield statements against the declared TValue and TKey)

Additionally, Phan will use @return Generator|TValue[] to analyze the yield statements within a function/method body the same way as it would analyze @return Generator<TValue>. (Analysis outside the method would not change)
Add support for template params in Iterator and Traversable types in phpdoc. (#824) NOTE: Internal subtypes of those classes (e.g. ArrayObject) are not supported yet. Supported syntaxes are:
1. Traversable<TValue>/Iterator<TValue>
2. Traversable<TKey,TValue>/Iterator<TKey,TValue>
Analyze yield from statements.

New issue types: PhanTypeInvalidYieldFrom (Emitted when the expression passed to yield from is not a Traversable or an array)

Warnings about the inferred keys/values of yield from being invalid reuse PhanTypeMismatchGeneratorYieldValue and PhanTypeMismatchGeneratorYieldKey
Make the union types within the phpdoc template syntax of iterator/Traversable/Iterator/Generator affect analysis of the keys/values of foreach statements
Improve Phan's analysis of array functions modifying arguments by reference, reducing false positives. (#1662) Affects array_shift/array_unshift/array_push/array_pop/array_splice.

Misc

Infer that a falsey array is the empty array shape.

Bug Fixes

Consistently warn about unreferenced declared properties (i.e. properties that are not magic or dynamically added). Previously, Phan would just never warn if the class had a __get() method (as a heuristic).

03 Apr 2018, Phan 0.12.5

Plugins

Add an option 'php_native_syntax_check_max_processes' to 'plugin_config' for InvokePHPNativeSyntaxCheckPlugin.

Bug Fixes

Remove extra whitespace from messages of comment text in UnextractableAnnotationElementName (e.g. "\r")
Fix bugs in InvokePHPNativeSyntaxCheckPlugin

31 Mar 2018, Phan 0.12.4

New Features(CLI, Configs)

Add a strict_param_checking config setting. (And a --strict-param-checking CLI flag) If this is set to true, then Phan will warn if at least one of the types in an argument's union type can't cast to the expected parameter type. New issue types: PhanPartialTypeMismatchArgument, PhanPossiblyNullTypeArgument, and PhanPossiblyFalseTypeArgument (along with equivalents for internal functions and methods)

Setting this to true will likely introduce large numbers of warnings. Those issue types would need to be suppressed entirely, or with @phan-file-suppress, or with @suppress.
Add a strict_property_checking config setting. (And a --strict-property-checking CLI flag) If this is set to true, then Phan will warn if at least one of the types in an assignment's union type can't cast to the expected property type. New issue types: PhanPartialTypeMismatchProperty, PhanPossiblyNullTypeProperty, and PhanPossiblyFalseTypeProperty

NOTE: This option does not make Phan check if all possible expressions have a given property, but may do that in the future.
Add a strict_return_checking config setting. (And a --strict-return-checking CLI flag) If this is set to true, then Phan will warn if at least one of the types in a return statement's union type can't cast to the expected return type. New issue types: PhanPartialTypeMismatchReturn, PhanPossiblyNullTypeReturn, and PhanPossiblyFalseTypeReturn

Setting this to true will likely introduce large numbers of warnings. Those issue types would need to be suppressed entirely, or with @phan-file-suppress, or with @suppress.
Add a --strict-type-checking CLI flag, to enable all of the new strict property/param/return type checks.
Add a guess_unknown_parameter_type_using_default config, which can be enabled to make Phan more aggressively infer the types of undocumented optional parameters from the parameter's default value. E.g. function($x = 'val') would make Phan infer that the function expects $x to have a type of string, not string|mixed.

Plugins

Add a new plugin InvokePHPNativeSyntaxCheckPlugin on all analyzed files (but not files excluded from analysis) (#629)
Add a new plugin capability AfterAnalyzeFileCapability that runs after a given file is analyzed. This does not get invoked for files that are excluded from analysis, or for empty files.

New Features(Analysis)

Detect unreachable catch statements (#112) (Check if an earlier catch statement caught an ancestor of a given catch statement)
Support phpdoc3's scalar type in phpdoc. (#1589) That type is equivalent to bool|float|int|string.
Improve analysis of return statements with ternary conditionals (e.g. return $a ?: $b).
Start analyzing negated instanceof conditionals such as assert(!($x instanceof MyClass)).
Infer that the reference parameter's resulting type for preg_match is a string[], not array (when possible) (And that the type is array{0:string,1:int}[] when PREG_OFFSET_CAPTURE is passed as a flag)
Warn in more places when Phan can't extract union types or element identifiers from a doc comment. New issue types: UnextractableAnnotationElementName, UnextractableAnnotationSuffix. (E.g. warn about @param int description (ideally has param name) and @return int? (Phan doesn't parse the ?, should be @return ?int))

Bug Fixes

Don't emit false positive PhanTypeArraySuspiciousNullable, etc. for complex isset/empty/unset expressions. (#642)
Analyze conditionals wrapped by @(cond) (e.g. if (@array_key_exists('key', $array)) {...}) (#1591)
Appending an unknown type to an array shape should update Phan's inferred keys(int) and values(mixed) of an array. (#1560)
Make line numbers for arguments more accurate
Infer that the result of | or & on two strings is a string.
Fix a crash caused by empty FQSENs for classlike names or function names (#1616)

24 Mar 2018, Phan 0.12.3

New Features(CLI, Configs)

Add --polyfill-parse-all-element-doc-comments for PHP 7.0. If you're using the polyfill (e.g. using --force-polyfill-parser), this will parse doc comments on class constants in php 7.0. (Normally, the polyfill wouldn't include that information, to closely imitate php-ast's behavior)

New Features(Analysis)

Infer the type of [] as array{} (the empty array), not array. (#1382)
Allow phpdoc @param array shapes to contain optional fields. (E.g. array{requiredKey:int,optionalKey?:string}) (#1382) An array shape is now allowed to cast to another array shape, as long as the required fields are compatible with the target type, and any optional fields from the target type are absent in the source type or compatible.
In issue messages, represent closures by their signatures instead of as \closure_{hexdigits}
Emit PhanTypeArrayUnsetSuspicious when trying to unset the offset of something that isn't an array or array-like.
Add limited support for analyzing unset on variables and the first dimension of arrays. Unsetting variables does not yet work in conditional branches.
Don't emit PhanTypeInvalidDimOffset in isset/empty/unset
Improve Phan's analysis of loose equality (#1101)
Add new issue types PhanWriteOnlyPublicProperty, PhanWriteOnlyProtectedProperty, and PhanWriteOnlyPrivateProperty, which will be emitted on properties that are written to but never read from. (Requires that dead code detection be enabled)
Improve Phan's analysis of switch statements and fix bugs. (#1561)
Add PhanTypeSuspiciousEcho to warn about suspicious types being passed to echo/print statements. This now warns about booleans, arrays, resources, null, non-stringable classes, combinations of those types, etc. (var_export or JSON encoding usually makes more sense for a boolean/null)
Make Phan infer that top-level array keys for expressions such as if (isset($x['keyName'])) exist and are non-null. (#1514)
Make Phan infer that top-level array keys for expressions such as if (array_key_exists('keyName', $x)) exist. (#1514)
Make Phan aware of types after negated of isset/array_key_exists checks for array shapes (E.g. if (!array_key_exists('keyName', $x)) { var_export($x['keyName']); }) Note: This will likely fail to warn if the variable is already a mix of generic arrays and array shapes.
Make Phan check that types in @throws annotations are valid; don't warn about classes in @throws being unreferenced. (#1555) New issue types: PhanUndeclaredTypeThrowsType, PhanTypeInvalidThrowsNonObject, PhanTypeInvalidThrowsNonThrowable, PhanTypeInvalidThrowsIsTrait, PhanTypeInvalidThrowsIsInterface

New types:

Add Closure and callable with annotated param types and return to Phan's type system(#1578, #1581). This is not a part of the phpdoc2 standard or any other standard. These can be used in any phpdoc tags that Phan is aware of, to indicate their expected types (@param, @var, @return, etc.)

Examples:
- function(int $x) : ?int {return $x;} has the type Closure(int):?int, which can cast to callable(int):?int
- function(array &$x) {$x[] = 2;} has the type Closure(array&):void
- function(int $i = 2, int ...$args) : void {} has the type Closure(int=,int...):void
Note: Complex return types such as int[] or int|false must be surrounded by brackets to avoid potential ambiguities.
- e.g. Closure(int|array): (int[])
- e.g. Closure(): (int|false)
- e.g. Closure(): (array{key:string}) is not ambiguous, but the return type must be surrounded by brackets for now
Other notes:
- For now, the inner parameter list of Closure(...) cannot contain the characters ( or ) (or ,, except to separate the arguments) Future changes are planned to allow those characters.
- Phan treats Closure(T) as an alias of Closure(T):void
- Placeholder variable names can be part of these types, similarly to @method (Closure($unknown,int $count=0):T is equivalent to Closure(mixed,int):T

Maintenance

Add --disable-usage-on-error option to phan_client (#1540)
Print directory which phan daemon is going to await analysis requests for (#1544)
Upgrade the dependency Microsoft/tolerant-php-parser to 0.0.10 (includes minor bug fixes)

Bug Fixes

Allow phpdoc @param array shapes to contain union types (#1382)
Remove leading ./ from Phan's relative paths for files (#1548, #1538)
Reduce false positives in dead code detection for constants/properties/methods.
Don't warn when base classes access protected properties of their subclasses.

02 Mar 2018, Phan 0.12.2

New Features(Analysis)

Emit PhanTypeInvalidDimOffsetArrayDestructuring when an unknown offset value is used in an array destructuring assignment (#1534, #1477) (E.g. foreach ($expr as ['key' => $value]), list($k) = [2], etc.)

Plugins

Add a new plugin capability PostAnalyzeNodeCapability (preferred) and LegacyPostAnalyzeNodeCapability. These capabilities give plugins for post-order analysis access to a list of parent nodes, instead of just the last parent node. Plugin authors should use these instead of AnalyzeNodeCapability and LegacyAnalyzeNodeCapability.

(parent_node_list is set as an instance property on the visitor returned by PostAnalyzeNodeCapability if the instance property was declared)

Maintenance:

Speed up analysis when quick mode isn't used.

Bug Fixes

Reduce false positives in PhanTypeInvalidDimOffset
Don't warn when adding new keys to an array when assigning multiple dimensions at once (#1518)
Reduce false positives when a property's type gets inferred as an array shape(#1520)
Reduce false positives when adding fields to an array in the global scope.
Reduce false positives by converting array shapes to generic arrays before recursively analyzing method/function invocations (#1525)

28 Feb 2018, Phan 0.12.1

New Features(Analysis)

Emit PhanTypeInvalidDimOffset when an unknown offset is fetched from an array shape type. (#1478)

Bug Fixes

Fix an "Undefined variable" error when checking for php 7.1/7.0 incompatibilities in return types. (#1511) Fix other crashes.

25 Feb 2018, Phan 0.12.0

The Phan 0.12.0 release supports analysis of php 7.0-7.2, and can be executed with php 7.0+. This release replaces the previous releases (The 0.11 releases for php 7.2, the 0.10 releases for php 7.1, and the 0.8 releases for php 7.0) Because Phan uses Reflection, it's recommended to use the same PHP minor version for analyzing the code as would be used to run the code. (For the small number of function/method signatures, etc., that were added or changed in each minor release of PHP.)

After upgrading Phan, projects using phan should add a target_php_version setting to their .phan/config.php.

New Features(CLI, Configs)

Add a target_php_version config setting, which can be set to '7.0', '7.1', '7.2', or null/'native'. (#1174) This defaults to the same PHP minor version as the PHP binary used to run Phan. target_php_version can be overridden via the CLI option --target-php-version {7.0,7.1,7.2,native}

NOTE: This setting does not let a PHP 7.0 installation parse PHP 7.1 nullable syntax or PHP 7.1 array destructuring syntax.

If you are unable to upgrade the PHP version used for analysis to php 7.1, the polyfill parser settings may help (See --force-polyfill-parser or --use-fallback-parser. Those have a few known bugs in edge cases.)
Add --init CLI flag and CLI options to affect the generated config. (#145) (Options: --init-level=1..5, --init-analyze-dir=path/to/src, --init-analyze-file=path/to/file.php, --init-no-composer, --init-overwrite)

New Features(Analysis)

In doc comments, support @phan-var, @phan-param, @phan-return, @phan-property, and @phan-method. (#1470) These annotations will take precedence over @var, @param, @return, @property, and @method.
Support @phan-suppress as an alias of @suppress.
Add a non-standard way to explicitly set var types inline. (#890) ; '@phan-var T $varName'; expression_using($varName); and ; '@phan-var-force T $varName'; expression_using($varName);

If Phan sees a string literal containing @phan-var as a top-level statement of a statement list, it will immediately set the type of $varName to T without any type checks. (@phan-var-force T $x will do the same thing, and will create the variable if it didn't already exist).

Note: Due to limitations of the php-ast parser, Phan isn't able to use inline doc comments, so this is the solution that was used instead.

Example Usage:
```
$values = mixed_expression();

// Note: This annotation must go **after** setting the variable.
// This has to be a string literal; phan cannot parse inline doc comments.
'@phan-var array<int,MyClass> $values';

foreach ($x as $instance) {
    function_expecting_myclass($x);
}
```
Add a way to suppress issues for the entire file (including within methods, etc.) (#1190) The @phan-file-suppress annotation can also be added to phpdoc for classes, etc. This feature is recommended for use at the top of the file or on the first class in the file. It may or may not affect statements above the suppression. This feature may fail to catch certain issues emitted during the parse phase.
```
<?php
// Add a suppression for remaining statements in this file.
'@phan-file-suppress PhanUnreferencedUseNormal (description)';
use MyNS\MyClass;
// ...

/** @SomeUnreadableAnnotation {MyClass} */
class Example { }
```
Add CompatibleNullableTypePHP70, CompatibleShortArrayAssignPHP70, CompatibleKeyedArrayAssignPHP70, CompatibleKeyedArrayAssignPHP70, and CompatibleIterableTypePHP70, (#1174, #624, #449) which are emitted when the target_php_version is less than '7.1'.
Add CompatibleObjectTypePHP71, which is emitted for the object typehint when the target_php_version is less than 7.2. (#1174, #827)
Add PhanTypeMismatchDimFetchNullable, which is emitted if the non-null version of the dimension type would be a valid index. (#1472)
Emit PhanTypeArraySuspiciousNullable when accessing fields of a nullable array (now including ?(T[]), etc.). (#1472) (Stop emitting PhanTypeArraySuspicious for ?array)
Add PhanNoopBinaryOperator and PhanNoopUnaryOperator checks (#1404)
Add PhanCommentParamOutOfOrder code style check. (#1401) This checks that @param annotations appear in the same order as the real parameters.
Detect unused imports (Does not parse inline doc comments) (#1095) Added PhanUnreferencedUseNormal, PhanUnreferencedUseFunction, PhanUnreferencedUseConstant.

(Note that Phan does not parse inline doc comments, which may cause false positives for PhanUnreferencedUseNormal)
Add PhanTypeMismatchArrayDestructuringKey checks for invalid array key types in list assignments (E.g. list($x) = ['key' => 'value'] (#1383)

Language Server

Support running Language Server and daemon mode on Windows (#819) (the pcntl dependency is no longer mandatory for running Phan as a server) The --language-server-allow-missing-pcntl option must be set by the client.

When this fallback is used, Phan manually saves and restores the data structures that store information about the project being analyzed.

This fallback is new and experimental.
Make Phan Language Server analyze new files added to a project (Issue #920)
Analyze all of the PHP files that are currently opened in the IDE according to the language server client, instead of just the most recently edited file (Issue #1147) (E.g. analyze other files open in tabs or split windows)
When closing or deleting a file, clear the issues that were emitted for that file.
If analysis requests (opening files, editing files, etc) are arriving faster than Phan can analyze and generate responses, then buffer the file changes (until end of input) and then begin to generate analysis results.

Hopefully, this should reduce the necessity for limiting Phan to analyzing only on save.

Bug fixes

In files with multiple namespaces, don't use use statements from earlier namespaces. (#1096)
Fix bugs analyzing code using functions/constants provided by group use statements, in addition to use function and use const statements.

14 Feb 2018, Phan 0.11.3

Ported from Phan 0.10.5

New Features(CLI, Configs)

Add --allow-polyfill-parser and --force-polyfill-parser options. These allow Phan to be run without installing php-ast.

Using the native php-ast extension is still recommended. The polyfill is slower and has several known bugs.

Additionally, the way doc comments are parsed by the polyfill is different. Doc comments for elements such as closures may be parsed differently from php-ast

Maintenance:

Fix bugs in the --use-fallback-parser mode. Upgrade the tolerant-php-parser dependency (contains bug fixes and performance improvements)

Bug fixes

Fix a bug in tool/make_stubs when generating stubs of namespaced global functions.
Fix a refactoring bug that caused methods and properties to fail to be inherited (#1456)
If ignore_undeclared_variables_in_global_scope is true, then analyze assert() and conditionals in the global scope as if the variable was defined after the check.

11 Feb 2018, Phan 0.11.2

Ported from Phan 0.10.4

New Features(Analysis)

Support array key types of int, string, and mixed (i.e. int|string) in union types such as array<int,T> (#824)

Check that the array key types match when assigning expected param types, return types, property types, etc. By default, an array with a key type of int can't cast to an array key type of string, or vice versa. Mixed union types in keys can cast to/from any key type.
- To allow casting array<int,T> to array<string,T>, enable scalar_array_key_cast in your .phan/config.php.
Warn when using the wrong type of array keys offsets to fetch from an array (E.g. string key for array<int,T>) (Issue #1390)
Infer array key types of int, string, or int|string in foreach over arrays. (#1300) (Phan's type system doesn't support inferring key types for iterable or Traversable right now)
Support parsing PHPDoc array shapes (E.g. a function expecting ['field' => 'a string'] can document this as @param array{field:string} $options) For now, this is converted to generic arrays (Equivalent to string[]).

[[0, ...], new stdClass] would have type array{0:int[], 1:string}
- The field value types can be any union type.
- Field keys are currently limited to keys matching the regex [-_.a-zA-Z0-9\x7f-\xff]+. (Identifiers, numbers, '-', and '.') Escape mechanisms such as backslashes (e.g. "\x20" for " ") may be supported in the future.
Add PhanTypeMismatchUnpackKey and PhanTypeMismatchUnpackValue to analyze array unpacking operator (also known as splat) (#1384)

Emit PhanTypeMismatchUnpackKey when passing iterables/arrays with invalid keys to the unpacking operator (i.e. ...).

Emit PhanTypeMismatchUnpackValue when passing values that aren't iterables or arrays to the unpacking operator. (See https://secure.php.net/manual/en/migration56.new-features.php#migration56.new-features.splat)
When determining the union type of an array literal, base it on the union types of all of the values (and all of the keys) instead of just the first 5 array elements.
When determining the union type of the possible value types of an array literal, combine the generic types into a union type instead of simplifying the types to array. In practical terms, this means that [1,2,'a'] is seen as array<int,int|string>, which Phan represents as array<int,int>|array<int,string>.

In the previous Phan release, the union type of [1,2,'a'] would be represented as int[]|string[], which is equivalent to array<mixed,int>|array<mixed,string>

Another example: [$strKey => new MyClass(), $strKey2 => $unknown] will be represented as array<string,MyClass>|array<string,mixed>. (If Phan can't infer the union type of a key or value, mixed gets added to that key or value.)
Improve analysis of try/catch/finally blocks (#1408) Analyze catch blocks with the inferences about the try block. Analyze a finally block with the combined inferences from the try and catch blocks.
Account for side effects of && and || operators in expressions, outside of if/assert statements. (#1415) E.g. $isValid = ($x instanceof MyClass && $x->isValid()) will now consistently check that isValid() exists on MyClass.
Improve analysis of expressions within conditionals, such as if (!($x instanceof MyClass) || $x->method()) or if (!(cond($x) && othercond($x)))

(Phan is now aware of the types of the right-hand side of || and && in more cases)
Add many param and return type signatures for internal functions and methods, for params and return types that were previously untyped. (Imported from docs.php.net's SVN repo)
More precise analysis of the return types of var_export(), print_r(), and json_decode() (#1326, #1327)
Improve type narrowing from iterable to \Traversable/array (#1427) This change affects is_array()/is_object() checks and their negations.
Fix more edge cases which would cause Phan to fail to infer that properties, constants, or methods are inherited. (PR #1440 for issues #311, #1426, #454)

Plugins

Fix bugs in NonBoolBranchPlugin and NonBoolInLogicalArithPlugin (#1413, #1410)
Make UnionType instances immutable. This will affect plugins that used addType/addUnionType/removeType. withType/withUnionType/withoutType should be used instead. To modify the type of elements(properties, method return types, parameters, variables, etc), plugin authors should use Element->setUnionType(plugin_modifier_function(Element->getUnionType())).

Language server:

Add a CLI option --language-server-analyze-only-on-save to prevent the client from sending change notifications. (#1325) (Only notify the language server when the user saves a document) This significantly reduces CPU usage, but clients won't get notifications about issues immediately.

Bug fixes

Warn when attempting to call an instance method on an expression with type string (#1314).
Fix a bug in tool/make_stubs when generating stubs of global functions.
Fix some bugs that occurred when Phan resolved inherited class constants in class elements such as properties. (#537 and #454)
Emit an issue when a function/method's parameter defaults refer to an undeclared class constant/global constant.

20 Jan 2018, Phan 0.11.1

Ported from Phan 0.10.3

New Features(CLI, Configs)

For --fallback-parser: Switch to tolerant-php-parser as a dependency of the fallback implementation. (#1125) This does a better job of generating PHP AST trees when attempting to parse code with a broader range of syntax errors. Keep PHP-Parser as a dependency for now for parsing strings.

Maintenance

Various performance optimizations, including caching of inferred union types to avoid unnecessary recalculation.
Make phan_client and the vim snippet in plugins/vim/phansnippet.vim more compatible with neovim
Upgrade felixfbecker/advanced-json-rpc dependency to ^3.0.0 (#1354)
Performance improvements. Changed the internal representation of union types to no longer require spl_object_id or the polyfill.

Bug Fixes

Allow null to be passed in where a union type of mixed was expected.
Don't warn when passing ?T (PHPDoc or real) where the PHPDoc type was T|null. (#609, #1090, #1192, #1337) This is useful for expressions used for property assignments, return statements, function calls, etc.
Fix a few of Phan's signatures for internal functions and methods.

17 Nov 2017, Phan 0.11.0

New Features (Analysis of PHP 7.2)

Support analyzing the object type hint in real function/method signatures. (#995)
Allow widening an overriding method's param types in php 7.2 branch (#1256) Phan continues warning about ParamSignatureRealMismatchHasNoParamType by default, in case a project needs to work with older php releases. Add 'allow_method_param_type_widening' => true if you wish for Phan to stop emitting that issue category.
Miscellaneous function signature changes for analysis of PHP 7.2 codebases (#828)

Ported from Phan 0.10.2

New Features(Analysis)

Enable simplify_ast by default. The new default value should reduce false positives when analyzing conditions of if statements. (#407, #1066)
Support less ambiguous ?(T[]) and (?T)[] in phpdoc (#1213) Note that (S|T)[] is not supported yet.
Support alternate syntax array<T> and array<Key, T> in phpdoc (PR #1213) Note that Phan ignores the provided value of Key completely right now (i.e. same as T[]); Key types will be supported in Phan 0.10.3.
Speed up Phan analysis on small projects, reduce memory usage (Around 0.15 seconds and 15MB) This was done by deferring loading the information about internal classes and functions until that information was needed for analysis.
Analyze existence and usage of callables passed to (internal and user-defined) function&methods expecting callable. (#1194) Analysis will now warn if the referenced function/method of a callable array/string (passed to a function/method expecting a callable param) does not exist.

This change also reduces false positives in dead code detection (Passing in these callable arrays/strings counts as a reference now)
Warn if attempting to read/write to a property or constant when the expression is a non-object. (or not a class name, for static elements) (#1268)
Split PhanUnreferencedClosure out of PhanUnreferencedFunction. (Emitted by --dead-code-detection)
Split PhanUnreferencedMethod into PhanUnreferencedPublicMethod, PhanUnreferencedProtectedMethod, and PhanUnreferencedPrivateMethod.
Split errors for class constants out of PhanUnreferencedConst: Add PhanUnreferencedPublicClassConst, PhanUnreferencedProtectedClassConst, and PhanUnreferencedPrivateClassConst. PhanUnreferencedConst is now exclusively used for global constants.
Analyze uses of compact() for undefined variables (#1089)
Add PhanParamSuspiciousOrder to warn about mixing up variable and constant/literal arguments in calls to built in string/regex functions (explode, strpos, mb_strpos, preg_match, etc.)
Preserve the closure's function signature in the inferred return value of Closure::bind(). (#869)
Support indicating that a reference parameter's input value is unused by writing @phan-output-reference on the same line as an @param annotation. This indicates that Phan should not warn about the passed in type, and should not preserve the passed in type after the call to the function/method. (In other words, Phan will analyze a user-defined reference parameter the same way as it would $matches in preg_match($pattern, $string, $matches)) Example usage: /** @param string $x @phan-output-reference */ function set_x(&$x) { $x = 'result'; }
Make phan infer unreachability from fatal errors such as trigger_error($message, E_USER_ERROR); (#1224)
Add new issue types for places where an object would be expected: PhanTypeExpectedObjectPropAccess, PhanTypeExpectedObjectPropAccessButGotNull, PhanTypeExpectedObjectStaticPropAccess, PhanTypeExpectedObject, and `PhanTypeExpectedObjectOrClassName
Emit more accurate line numbers for phpdoc comments, when warning about phpdoc in doc comments being invalid. (#1294) This gives up and uses the element's line number if the phpdoc ends over 10 lines before the start of the element.
Work on allowing union types to be part of template types in doc comments, as well as types with template syntax. (e.g. array<int|string> is now equivalent to int[]|string[], and MyClass<T1|T2,T3|T4> can now be parsed in doc comments)
Disambiguate the nullable parameter in output. E.g. an array of nullable integers will now be printed in error messages as (?int)[] A nullable array of integers will continue to be printed in error messages as ?int[], and can be specified in PHPDoc as ?(int[]).

New Features (CLI, Configs)

Improve default update rate of --progress-bar (Update it every 0.10 seconds)

Bug Fixes

Fixes bugs in PrintfCheckerPlugin: Alignment goes before width, and objects with __toString() can cast to %s. (#1225)
Reduce false positives in analysis of gotos, blocks containing gotos anywhere may do something other than return or throw. (#1222)
Fix a crash when a magic method with a return type has the same name as a real method.
Allow methods to have weaker PHPdoc types than the overridden method in PhanParamSignatureMismatch. (#1253) PhanParamSignatureRealMismatch* is unaffected, and will continue working the same way in Phan releases analyzing PHP < 7.2.
Stop warning about PhanParamSignatureMismatch, etc. for private methods. The private methods don't affect each other. (#1250)
Properly parse ?self as a nullable instance of the current class in union types (#1264)
Stop erroneously warning about inherited constants being unused in subclasses for dead code detection (#1260)
For dead code detection, properly track uses of inherited class elements (methods, properties, classes) as uses of the original definition. (#1108) Fix the way that uses of private/protected methods from traits were tracked. Also, start warning about a subset of issues from interfaces and abstract classes (e.g. unused interface constants)
Properly handle static::class as a class name in an array callable, or static::method_name in a string callable (#1232)
Make @template tag for Generic Types case-sensitive. (#1243)
Fix a bug causing Phan to infer an empty union type (which can cast to any type) for arrays with elements of empty union types. (#1296)

Plugins

Make DuplicateArrayKeyPlugin start warning about duplicate values of known global constants and class constants. (#1139)
Make DuplicateArrayKeyPlugin start warning about case statements with duplicate values (This resolves constant values the same way as array key checks)
Support 'plugins' => ['AlwaysReturnPlugin'] as shorthand for full relative path to a bundled plugin such as AlwaysReturnPlugin.php (#1209)

Maintenance

Performance improvements: Phan analysis is 13%-22% faster than 0.10.1, with simplify_ast enabled.
Used PHP_CodeSniffer to automatically make Phan's source directory adhere closely to PSR-1 and PSR-2, making minor changes to many files. (e.g. which line each brace goes on, etc.)
Stop tracking references to internal (non user-defined) elements (constants, properties, functions, classes, and methods) during dead code detection. (Dead code detection now requires an extra 15MB instead of 17MB for self-analysis)

20 Oct 2017, Phan 0.10.1

New Features(Analysis)

Support @return $this in phpdoc for methods and magic methods. (but not elsewhere. E.g. @param $this $varName is not supported, use @param static $varName) (#634)
Check if functions/methods passed to array_map and array_filter are compatible with their arguments. Recursively analyze the functions/methods passed to array_map/array_filter if no types were provided. (unless quick mode is being used)

New Features (CLI, Configs)

Add Language Server Protocol support (Experimental) (#821) Compatibility: Unix, Linux (depends on php pcntl extension). This has the same analysis capabilities provided by daemon mode. Supporting a standard protocol should make it easier to write extensions supporting Phan in various IDEs. See https://github.com/Microsoft/language-server-protocol/blob/master/README.md
Add config (autoload_internal_extension_signatures) to allow users to specify PHP extensions (modules) used by the analyzed project, along with stubs for Phan to use (instead of ReflectionFunction, etc) if the PHP binary used to run Phan doesn't have those extensions enabled. (#627) Add a script (tool/make_stubs) to output the contents of stubs to use for autoload_internal_extension_signatures (#627).
By default, automatically restart Phan without Xdebug if Xdebug is enabled. (#1161) If you wish to analyze a project using Xdebug's functions, set autoload_internal_extension_signatures (e.g. ['xdebug' => 'vendor/phan/phan/.phan/internal_stubs/xdebug.phan_php']) If you wish to use Xdebug to debug Phan's analysis itself, set and export the environment variable PHAN_ALLOW_XDEBUG=1.
Improve analysis of return types of array_pop, array_shift, current, end, next, prev, reset, array_map, array_filter, etc. See ArrayReturnTypeOverridePlugin.php. Phan can analyze callables (for array_map/array_filter) of Closure form, as well as strings/2-part arrays that are inlined.
Add --memory-limit CLI option (e.g. --memory-limit 500M). If this option isn't provided, there is no memory limit. (#1148)

Maintenance

Document the --disable-plugins CLI flag.

Plugins

Add a new plugin capability ReturnTypeOverrideCapability which can override the return type of functions and methods on a case by case basis. (e.g. based on one or more of the argument types or values) (related to #612, #1181)
Add a new plugin capability AnalyzeFunctionCallCapability which can add logic to analyze calls to a small subset of functions. (e.g. based on one or more of the argument types or values) (#1181)
Make line numbers more accurate in DuplicateArrayKeyPlugin.
Add PregRegexCheckerPlugin to check for invalid regexes. (uses AnalyzeFunctionCallCapability). This plugin is able to resolve literals, global constants, and class constants as regexes. See the corresponding section of .phan/plugins/README.md
Add PrintfCheckerPlugin to check for invalid format strings or incorrect arguments in printf calls. (uses AnalyzeFunctionCallCapability) This plugin is able to resolve literals, global constants, and class constants as format strings. See the corresponding section of .phan/plugins/README.md

Bug Fixes

Properly check for undeclared classes in arrays within phpdoc @param, @property, @method, @var, and @return (etc.) types. Also, fix a bug in resolving namespaces of generic arrays that are nested 2 or more array levels deep.
Fix uncaught TypeError when magic property has the same name as a property. (#1141)
Make AlwaysReturnPlugin warn about functions/methods with real nullable return types failing to return a value.
Change the behavior of the -d flag, make it change the current working directory to the provided directory.
Properly set the real param type and return types of internal functions, in rare cases where that exists.
Support analyzing the rare case of namespaced internal global functions (e.g. \ast\parse_code($code, $version))
Improve analysis of shorthand ternary operator: Remove false/null from cond_expr in (cond_expr) ?: (false_expr) (#1186)

24 Sep 2017, Phan 0.10.0

New Features(Analysis)

Check types of dimensions when using array access syntax (#406, #1093) (E.g. for an array, check that the array dimension can cast to int|string)

New Features (CLI, Configs)

Add option ignore_undeclared_functions_with_known_signatures which can be set to false to always warn about global functions Phan has signatures for but are unavailable in the current PHP process (and enabled extensions, and the project being analyzed) (#1080) The default was/is to not warn, to reduce false positives.
Add CLI flag --use-fallback-parser (Experimental). If this flags is provided, then when Phan analyzes a syntactically invalid file, it will try again with a parser which tolerates a few types of errors, and analyze the statements that could be parsed. Useful in combination with daemon mode.
Add phpdoc_type_mapping config setting. Projects can override this to make Phan ignore or substitute non-standard phpdoc2 types and common typos (#294) (E.g. 'phpdoc_type_mapping' => ['the' => '', 'unknown_type' => '', 'number' => 'int|float'])

Maintenance

Increased minimum ext-ast version constraint to 0.1.5, switched to AST version 50.
Update links to project from github.com/etsy/phan to github.com/phan/phan.
Use the native spl_object_id function if it is available for the union type implementation. This will make phan 10% faster in PHP 7.2. (for PHP 7.1, https://github.com/runkit7/runkit_object_id 1.1.0+ also provides a native implementation of spl_object_id)
Reduce memory usage by around 5% by tracking only the file and lines associated with variables, instead of a full Context object.

Plugins

Increased minimum ext-ast version constraint to 0.1.5, switched to AST version 50. Third party plugins will need to create a different version, Decls were changed into regular Nodes
Implement AnalyzePropertyCapability and FinalizeProcessCapability. Make UnusedSuppressionPlugin start using AnalyzePropertyCapability and FinalizeProcessCapability. Fix bug where UnusedSuppressionPlugin could run before the suppressed issues would be emitted, making it falsely emit that suppressions were unused.

Bug Fixes

Fix a few incorrect property names for Phan's signatures of internal classes (#1085)
Fix bugs in lookup of relative and non-fully qualified class and function names (#1097)
Fix a bug affecting analysis of code when simplify_ast is true.
Fix uncaught NodeException when analyzing complex variables as references (#1116), e.g. function_expecting_reference($$x).

15 Aug 2017, Phan 0.9.4

New Features (Analysis)

Check (the first 5) elements of returned arrays against the declared return union types, individually (Issue #935) (E.g. /** @return int[] */ function foo() {return [2, "x"]; } will now warn with PhanTypeMismatchReturn about returning string[])
Check both sides of ternary conditionals against the declared return union types (E.g. function foo($x) : int {return is_string($x) ? $x : 0; } will now warn with PhanTypeMismatchReturn about returning a string).
Improved analysis of negations of conditions within ternary conditional operators and else/else if statements. (Issue #538) Support analysis of negation of the || operator. (E.g. if (!(is_string($x) || is_int($x))) {...})
Make phan aware of blocks of code which will unconditionally throw or return. (Issue #308, #817, #996, #956)

Don't infer variable types from blocks of code which unconditionally throw or return.

Infer the negation of type assertions from if statements that unconditionally throw/return/break/continue. (E.g. if (!is_string($x)) { return false; } functionUsingX($x);)

When checking if a variable is defined by all branches of an if statement, ignore branches which unconditionally throw/return/break/continue.
To reduce the false positives from analysis of the negation of type assertions, normalize nullable/boolean union types after analyzing code branches (E.g. if/else) affecting the types of those variables. (e.g. convert "bool|false|null" to "?bool")
Add a new plugin file AlwaysReturnPlugin. (Issue #996) This will add a stricter check that a function with a non-null return type unconditionally returns a value (or explicitly throws, or exit()s). Currently, Phan just checks if a function may return, or unconditionally throws.
Add a new plugin file UnreachableCodePlugin (in development). This will warn about statements that appear to be unreachable (statements occurring after unconditional return/break/throw/return/exit statements)

New Features (CLI, Configs)

Add config setting prefer_narrowed_phpdoc_return_type (See "New Features (CLI, Configs)), which will use only the phpdoc return types for inferences, if they're narrowed. This config is enabled by default, and requires check_docblock_signature_return_type_match to be enabled.

Bug Fixes

Work around notice about COMPILER_HALT_OFFSET on windows.
Fixes #462 : Fix type inferences for instanceof for checks with dynamic class names are provided. Valid class names are either a string or an instance of the class to check against. Warn if the class name is definitely invalid.
Fix false positives about undefined variables in isset()/empty() (Issue #1039) (Fixes bug introduced in Phan 0.9.3)
Fix false positive warnings about accessing protected methods from traits (Issue #1033) Act as though the class which used a trait is the place where the method was defined, so that method visibility checks work properly. Additionally, fix false positive warnings about visibility of method aliases from traits.
Warn about instantiation of class with inaccessible constructor (Issue #1043)
Fix rare uncaught exceptions (Various)
Make issues and plugin issues on properties consistently use suppressions from the plugin doc comment.

Changes In Emitted Issues

Improve InvalidVariableIssetPlugin. Change the names and messages for issue types. Emit PhanPluginUndeclaredVariableInIsset and PhanPluginComplexVariableIsset instead of PhanUndeclaredVariable. Stop erroneously warning about valid property fetches and checks of fields of superglobals.

0.9.3 Jul 11, 2017

New Features (Analysis)

Automatically inherit @param and @return types from parent methods. This is controlled by the boolean config inherit_phpdoc_types, which is true by default. analyze_signature_compatibility must also be set to true (default is true) for this step to be performed.
Better analysis of calls to parent::__construct(). (Issue #852)
Warn with PhanAccessOwnConstructor if directly invoking self::__construct or static::__construct in some cases (partial).
Start analyzing the inside of for/while loops using the loop's condition (Issue #859) (Inferences may leak to outside of those loops. do{} while(cond) is not specially analyzed yet)
Improve analysis of types in expressions within compound conditions (Issue #847) (E.g. if (is_array($x) && fn_expecting_array($x)) {...})
Evaluate the third part of a for loop with the context after the inner body is evaluated (Issue #477)
Emit PhanUndeclaredVariableDim if adding an array field to an undeclared variable. (Issue #841) Better analyze list($var['field']) = values
Improve accuracy of PhanTypeMismatchDeclaredReturn (Move the check to after parse phase is finished)
Enable check_docblock_signature_return_type_match and check_docblock_signature_param_type_match by default. Improve performance of those checks. Switch to checking individual types (of the union type) of the phpdoc types and emitting issues for each invalid part.
Create PhanTypeMismatchDeclaredParam (Move the check to after parse phase is finished) Also add config setting prefer_narrowed_phpdoc_param_type (See "New Features (CLI, Configs)) This config is enabled by default.

Also create PhanTypeMismatchDeclaredParamNullable when params such as function foo(string $x = null) are documented as the narrowed forms @param null $x or @param string $x. Those should be changed to either string|null or ?string.
Detect undeclared return types at point of declaration, and emit PhanUndeclaredTypeReturnType (Issue #835)
Create PhanParamSignaturePHPDocMismatch* issue types, for mismatches between @method and real signature/other @method tag.
Create PhanAccessWrongInheritanceCategory* issue types to warn about classes extending a trait/interface instead of class, etc. (#873)
Create PhanExtendsFinalClass* issue types to warn about classes extending from final classes.
Create PhanAccessOverridesFinalMethod* issue types to warn about methods overriding final methods.
Create PhanTypeMagicVoidWithReturn to warn if void methods such as __construct, __set, etc return a value that would be ignored. (Issue #913)
Add check for PhanTypeMissingReturn within closures. Properly emit PhanTypeMissingReturn in functions/methods containing closures. (Issue #599)
Improved checking for PhanUndeclaredVariable in array keys and conditional conditions. (Issue #912)
Improved warnings and inferences about internal function references for functions such as sort, preg_match (Issue #871, #958) Phan is now aware of many internal functions which normally ignore the original values of references passed in (E.g. preg_match)
Properly when code attempts to access static/non-static properties as if they were non-static/static. (Issue #936)
Create PhanCommentOverrideOnNonOverrideMethod and PhanCommentOverrideOnNonOverrideConstant. (Issue #926) These issue types will be emitted if @override is part of doc comment of a method or class constant which doesn't override or implement anything. (@Override and @phan-override can also be used as aliases of @override. @override is not currently part of any phpdoc standard.)
Add @phan-closure-scope, which can be used to annotate closure definitions with the namespaced class it will be bound to (Issue #309, #590, #790) (E.g. if the intent was that Closure->bindTo or Closure->bind would be called to bind it to \MyNS\MyClass (or an instance of that class), then a closure could be declared as /** @phan-closure-scope \MyNS\MyClass */ function() { $this->somePrivateMyClassMethod(); }
Add Closure as a first class type, (Previously, closures were treated as callable in some places) (Issue #978)

New Features (CLI, Configs)

Create check_docblock_signature_param_type_match (similar to check_docblock_signature_return_type_match) config setting to enable warning if phpdoc types are incompatible with the real types. True(enabled) by default.

Create prefer_narrowed_phpdoc_param_type config setting (True by default, requires check_docblock_signature_return_type_match to be enabled). When it is true, Phan will analyze each function using the phpdoc param types instead of the provided signature types if the possible phpdoc types are narrower and compatible with the signature. (E.g. indicate that subclasses are expected over base classes, indicate that non-nullable is expected instead of nullable) This affects analysis both inside and outside the method.

Aside: Phan currently defaults to preferring phpdoc type over real return type, and emits PhanTypeMismatchDeclaredReturn if the two are incompatible.
Create enable_class_alias_support config setting (disabled by default), which enables analyzing basic usage of class_alias. (Issue #586) Set it to true to enable it. NOTE: this is still experimental.
Warn to stderr about running Phan analysis with Xdebug (Issue #116) The warning can be disabled by the Phan config setting skip_slow_php_options_warning to true.
Add a config setting 'scalar_implicit_partial' to allow moving away from 'scalar_implicit_cast' (Issue #541) This allows users to list out (and gradually remove) permitted scalar type casts.
Add null_casts_as_array and array_casts_as_null settings, which can be used while migrating away from null_casts_as_any_type. These will be checked if one of the types has a union type of null, as well as when checking if a nullable array can cast to a regular array.

Plugins

Redesign plugin system to be more efficient. (Issue #600) New plugins should extend \Phan\PluginV2 and implement the interfaces for capabilities they need to have, such as \Phan\PluginV2\AnalyzeClassCapability. In the new plugin system, plugins will only be run when they need to (Phan no longer needs to invoke an empty method body). Old subclasses of \Phan\Plugin\PluginImplementation will continue to work, but will be less efficient.

Maintenance

Reduce memory usage by around 15% by using a more efficient representation of union types (PR #729). The optional extension https://github.com/runkit7/runkit_object_id can be installed to boost performance by around 10%.
Check method signatures compatibility against all overridden methods (e.g. interfaces with the same methods), not just the first ones (Issue #925)

Bug Fixes

Work around known bugs in current releases of two PECL extensions (Issue #888, #889)
Fix typo - Change PhanParamSignatureRealMismatch to PhanParamSignatureRealMismatchReturnType
Consistently exit with non-zero exit code if there are multiple processes, and any process failed to return valid results. (Issue #868)
Fixes #986 : PhanUndeclaredVariable used to fail to be emitted in some deeply nested expressions, such as return $undefVar . 'suffix';
Make Phan infer the return types of closures, both for closures invoked inline and closures declared then invoked later (Issue #564)
Phan now correctly analyze global functions for mismatches of phpdoc types and real parameter types. Previously, it wouldn't emit warnings for global functions, only for methods.
Don't add mixed to inferred union types of properties which already have non-empty phpdoc types. (Issue #512) mixed would just result in Phan failing to emit any types of issues.
When simplify_ast is true, simplify the ASTs parsed in the parse mode as well. Makes analysis consistent when quick_mode is false (AST nodes from the parse phase would also be used in the analysis phase)
Don't emit PhanTypeNonVarPassByRef on arguments that are function/method calls returning references. (Issue #236)
Emit PhanContextNotObject more reliably when not in class scope.

Backwards Incompatible Changes

Fix categories of some issue types, renumber error ids for the pylint error formatter to be unique and consistent.

0.9.2 Jun 13, 2017

New Features (Analysis)

Add PhanParamSignatureRealMismatch* (e.g. ParamSignatureRealMismatchTooManyRequiredParameters), which ignores phpdoc types and imitates PHP's inheritance warning/error checks as closely as possible. (Issue #374) This has a much lower rate of false positives than PhanParamSignatureMismatch, which is based on Liskov Substitution Principle and also accounts for phpdoc types. (PhanParamSignatureMismatch continues to exist)
Create PhanUndeclaredStaticProperty (Issue #610) This is of higher severity than PhanUndeclaredProperty, because PHP 7 throws an Error. Also add PhanAccessPropertyStaticAsNonStatic
Supports magic instance/static @method annotations. (Issue #467) This is enabled by default.
Change the behavior of non-quick recursion (Affects emitted issues in large projects). Improve performance of non-quick analysis by checking for redundant analysis steps (E.g. calls from two different places passing the same union types for each parameter), continuing to recurse when passing by reference.
Support for checking for misuses of "@internal" annotations. Phan assumes this means it is internal to a namespace. (Issue #353) This checks properties, methods, class constants, and classes. (Adds PhanAccessConstantInternal, PhanAccessClassInternal, PhanAccessClassConstantInternal, PhanAccessPropertyInternal, PhanAccessMethodInternal) (The implementation may change)
Make conditionals such as is_string start applying to the condition in ternary operators ($a ? $b : $c)
Treat resource, object, and mixed as native types only when they occur in phpdoc. Outside of phpdoc (e.g. $x instanceof resource), analyze those names as if they were class names.
Emit low severity issues if Phan can't extract types from phpdoc, the phpdoc @param is out of sync with the code, or if the phpdoc annotation doesn't apply to an element type (Issue #778)
Allow inferring the type of variables from === conditionals such as if ($x === true)
Add issue type for non-abstract classes containing abstract methods from itself or its ancestors (PhanClassContainsAbstractMethod, PhanClassContainsAbstractMethodInternal)
Partial support for handling trait adaptations (as/insteadof) when using traits (Issue #312)
Start checking if uses of private/protected class methods defined in a trait are visible outside of that class. Before, Phan would always assume they were visible, to reduce false positives.
If Phan has inferred/been provided generic array types for a variable (e.g. int[]), then analysis of the code within if (is_array($x)) will act as though the type is int[]. The checks is_object and is_scalar now also preserve known sub-types of the group of types. (If Phan isn't aware of any sub-types, it will infer the generic version, e.g. object)
Start checking if unanalyzable variable accesses such as $$x are very likely to be invalid or typos (e.g. $x is an object or array or null) Emit PhanTypeSuspiciousIndirectVariable if those are seen. (PR #809)
Add partial support for inferring the union types of the results of expressions such as $x ^= 5 (e.g. in foo($x ^= 5)) (PR #809)
Thoroughly analyze the methods declared within traits, using only the information available within the trait. (Issue #800, PR #815) If new emitted issues are seen, users can (1) add abstract methods to traits, (2) add @method annotations, or (3) add @suppress annotations.

New Features (CLI, Configs)

(Linux/Unix only) Add Experimental Phan Daemon mode (PR #563 for Issue #22), which allows phan to run in the background, and accept TCP requests to analyze single files. (The implementation currently requires the pcntl extension, which does not in Windows) Server usage: path/to/phan --daemonize-tcp-port 4846 (In the root directory of the project being analyzed) Client usage: path/to/phan_client --daemonize-tcp-port 4846 -l src/file1.php [ -l src/file2.php ]
Add --color CLI flag, with rudimentary unix terminal coloring for the plain text output formatter. (Issue #363) Color schemes are customizable with color_scheme, in the config file.
Add the exclude_file_regex config to exclude file paths based on a regular expression (e.g. tests or example files mixed with the codebase) (#635) The regular expression is run against the relative path within the project.
Add --dump-parsed-file-list option to print files which Phan would parse.
Add experimental simplify_ast config, to simplify the AST into a form which improves Phan's type inference. (E.g. handles some variable declarations within if () statements. Infers that $x is a string for constructs such as if (!is_string($x)) {return;} function_using_x($x);) This is slow, and disabled by default.
Add --include-analysis-file-list option to define files that will be included in static analysis, to the exclusion of others.
Start emitting PhanDeprecatedFunctionInternal if an internal (to PHP) function/method is deprecated. (Phan emits PhanUndeclaredFunction if a function/method was removed; Functions deprecated in PHP 5.x were removed in 7.0)

Maintenance

Update function signature map to analyze iterable and is_iterable from php 7.1
Improve type inferences on functions with nullable default values.
Update miscellaneous new functions in php 7.1 standard library (e.g. getenv)

Bug Fixes

Fix PhanTypeMismatchArgument, etc. for uses of new static(), static::CONST, etc in a method. (Issue #632)
Fix uncaught exception when conditional node is a scalar (Issue #613)
Existence of __get() no longer affects analyzing static properties. (Issue #610)
Phan can now detect the declaration of constants relative to a used namespace (Issue #509)
Phan can now detect the declaration of functions relative to a used namespace (Issue #510)
Fix a bug where the JSON output printer accidentally escaped some output ("<"), causing invalid JSON.
Fix a bug where a print/echo/method call erroneously marked methods/functions as having a return value. (Issue #811)
Improve analysis of SimpleXMLElement (Issues #542, #539)
Fix crash handling trait use aliases which change only the method's visibility (Issue #861)

Backwards Incompatible Changes

Declarations of user-defined constants are now consistently analyzed in a case-sensitive way. This may affect projects using define(name, value, case_insensitive = true). Change the code being analyzed to exactly match the constant name in define())

0.9.1 Mar 15, 2017

New Features (Analysis)

Conditions in if(cond(A) && expr(A)) (e.g. instanceof, is_string, etc) now affect analysis of right-hand side of && (PR #540)
Add PhanDeprecatedInterface and PhanDeprecatedTrait, similar to PhanDeprecatedClass
Supports magic @property annotations, with aliases @property-read and @property-write`. (Issue #386) This is enabled by default.

Phan also supports the @phan-forbid-undeclared-magic-properties annotation, which will make it warn about undeclared properties if no real property or @property annotation exists.

New Features (CLI, Configs)

Add --version CLI flag
Move some rare CLI options from --help into --extended-help

Maintenance

Improved stability of analyzing phpdoc and real nullable types (Issue #567)
Fix type signatures Phan has for some internal methods.
Improve CLI --progress-bar tracking by printing 0% immediately.
Add Developer Certificate of Origin

Bug Fixes

Fix uncaught issue exception analyzing class constants (Issue #551)
Fix group use in ASTs
Fix false positives checking if native types can cast to/from nullable native types (Issue #567, #582)
Exit with non-zero exit code if an invalid CLI argument is passed to Phan

Backwards Incompatible Changes

Change the way that parameter's default values affect type inferences. (May now add to the union type or ignore default values. Used to always add the default value types) Add @param types if you encounter new issues. This was done to avoid false positives in cases such as function foo($maybeArray = false)
Increase minimum ext-ast version constraint to 0.1.4

0.9.0 Feb 21, 2017

The 0.9.x versions will be tracking syntax from PHP versions 7.1.x and is runnable on PHP 7.1+. Please use version 0.8.x if you're using a version of PHP < 7.1.

New Features (Analysis)

Support php 7.1 class constant visibility
Support variadic phpdoc in @param, e.g. @param string ...$args Avoid ambiguity by emitting PhanTypeMismatchVariadicComment and PhanTypeMismatchVariadicParam.
Initial support for php 7.1 nullable types and void, both in phpdoc and real parameters.
Initial support for php 7.1 iterable type
Both conditions from if(cond(A) && cond(B)) (e.g. instanceof, is_string, etc.) now affect analysis of the if element's block (PR #540)
Apply conditionals such as is_string to type guards in ternary operators (Issue #465)
Allow certain checks for removing null from Phan's inferred types, reducing false positives (E.g. if(!is_null($x) && $x->method())) (#518)
Incomplete support for specifying the class scope in which a closure will be used/bound (#309)
Support @return self in class context

New Features (CLI, Configs)

Introduce check_docblock_signature_return_type_match config (slow, disabled by default) (Checks if the phpdoc types match up with declared return types)

Maintenance

Add Code of Conduct
Fix type signatures for some internal methods and internal class properties.

Bug Fixes

Allow asserting object is a specific object type without warning (Issue #516)
Fix bugs in analysis of varargs within a function(Issue #516)
Treat null defaults in functions and methods the same way (Issue #508) In both, add null defaults to the UnionType only if there's already another type. In both, add non-null defaults to the UnionType (Contains mixed if there weren't any explicit types)
Specially handle phpdoc type aliases such as boolean only in phpdoc (Issue #471) (Outside of phpdoc, it refers to a class with the name boolean)
Add some internal classes other than stdClass which are allowed to have dynamic, undeclared properties (Issue #433)
Fix assertion errors when passing references by reference (Issue #500)

Backwards Incompatible Changes

Requires newer ext-ast version (Must support version 35).

0.8.3 Jan 26, 2017

The 0.8.x versions will be tracking syntax from PHP versions 7.0.x and is runnable on PHP 7.0+. Please use version 0.8.x if you're using a version of PHP < 7.1. For best results, run version 0.8.x with PHP 7.0 if you are analyzing a codebase which normally runs on php <= 7.0 (If php 7.1 is used, Phan will think that some new classes, methods, and functions exist or have different parameter lists because it gets this info from Reflection)

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