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Upgrading Instructions for Yii Framework 3.0

This file contains the upgrade notes for Yii 3.0. These notes highlight changes that could break your application when you upgrade Yii from one version to another. Even though we try to ensure backwards compatibility (BC) as much as possible, sometimes it is not possible or very complicated to avoid it and still create a good solution to a problem. While upgrade to Yii 3.0 might require substantial changes to both your application and extensions, the changes are bearable and require "refactoring", not "rewrite". All the "Yes, it is" cool stuff and Yii soul are still in place.

Changes summary:

Tip: Upgrading dependencies of a complex software project always comes at the risk of breaking something, so make sure you have a backup. You should back up anyway ;)

After upgrading you should check whether your application still works as expected and no tests are broken. See the following notes on which changes to consider when upgrading from one version to another.

Note: The following upgrading instructions are cumulative. That is, if you want to upgrade from version A to version C and there is version B between A and C, you need to follow the instructions for both A and B.

Upgrade from Yii 2.0.x

  • PHP requirements were raised to 7.1. Make sure your code is updated accordingly.

  • memcache PECL extension support was dropped. Use memcached PECL extension instead.

  • Removed Configurable and init() from BaseObject

    • __construct(array $config = []) is not supported
    • use yii\di\Initiable interface if you want init() function to be called by DI after construction of your class object

  • Yii helper is redone and doesn't provide "global vars" anymore:

    • change use Yii to use yii\helpers\Yii
    • Yii::$app is not available:
      • prefer to use constructor DI to get application and services
      • use Yii::get('service') instead of Yii::$app->getService()
      • use Yii::getApp() if everything else fails
    • aliases were moved to Aliases service:
      • prefered wat to resolve aliases:
        • DI injected aliases service or
        • $this->app->getAlias()
      • prefered way to set aliases is through configuration
    • added and used Application::t()
      • prefer $this->app->t() over Yii::t()
    • removed Yii::configure()
      • use yii\di\AbstractContainer::configure() if everything else fails
    • Yii::$container made private:
      • don't use it explicitly
      • use container implicitly with constructor DI
    • no need to require Yii class from entry script
    • to use Yii features use Yii::setContainer()
      • for it could access logger, profiler and i18n
      • else Yii functions will have generic behavior
      • see recommended entry script
    • removed Yii::$logger and Yii::$profiler, use DI instead
    • constant definitions moved to config/defines.php
      • YII_DEBUG defaults to YII_ENV_DEV
      • YII2_PATH renamed to YII_PATH
    • getObjectVars() moved to ArrayHelper

  • Removed ServiceLocator from Application and Module:

    • no own components in app and modules
    • get services implicitly with DI

  • Refactored internationalization:

    • Added Locale class able to parse BCP 47 locale strings. It's used instead of language.
    • Application::setEncoding method
      • encoding saved to ini_set('default_charset') and mb_internal_encoding() and thus applied by default to all PHP string functions like mb_*

  • Moved files around for more logic organization and more readable directories:

    • globally:
      • all exceptions moved into separate dirs in all packages
    • yii-web:
      • moved web formatters to their own directory
    • cache:
      • renamed namespace yii\caching -> Yiisoft\Cache
      • moved cache dependencies to own directory
    • yii-project-template:
      • moved web server root dir to public (was web)

  • Moved data displaying widgets to own package yiisoft/yii-dataview:

    • yii\grid -> Yiisoft\Yii\DataView
    • yii\grid\*Column -> Yiisoft\Yii\DataView\Columns\*
    • yii\widgets\ListView -> Yiisoft\Yii\DataView\ListView
    • yii\widgets\DetailView -> Yiisoft\Yii\DataView\DetailView

  • DI:

    • Config changed to be DI container config instead of application.
    • Removed yii\di\Instance class:
      • Use yii\di\Reference instead
      • Use yii\di\Factory::ensure() or Yii::ensureObject() instead of Instance::ensure()

  • Events were refactored:

    • event name constants moved to event classes:
      • yii\base\Application::EVENT_BEFORE_ACTION -> yii\base\ActionEvent::BEFORE
      • yii\base\Application::EVENT_AFTER_ACTION -> yii\base\ActionEvent::AFTER
      • yii\base\Application::EVENT_BEFORE_REQUEST -> yii\base\RequestEvent::BEFORE
      • yii\base\Application::EVENT_AFTER_REQUEST -> yii\base\RequestEvent::AFTER
      • yii\base\View::EVENT_END_BODY -> yii\view\BodyEvent::END
      • yii\base\View::EVENT_BEGIN_BODY -> yii\view\BodyEvent::BEGIN
      • yii\base\Response::EVENT_BEFORE_PREPARE -> yii\base\PrepareEvent::BEFORE (to be done)
      • yii\base\Response::EVENT_AFTER_PREPARE -> yii\base\PrepareEvent::AFTER (to be done)

  • Added default application configuration and support for config assembling with composer-config-plugin.

  • Tests:

    • Renamed yiiunit namespace to yii\tests
    • Added tests config

  • Following new methods have been added to yii\mail\MessageInterface addHeader(), setHeader(), getHeader(), setHeaders() providing ability to setup custom mail headers. Make sure your provide implementation for those methods, while creating your own mailer solution.

  • ::className() method calls should be replaced with native ::class. When upgrading to Yii 3.0, You should do a global search and replace for ::className() to ::class. All calls on objects via ->className() should be replaced by a call to get_class().

  • Dependency injection (DI) layer has been replaced by "yiisoft/di" package. Make sure to update class/object definitions at your code to match the syntax used by it. In particular: you should use '__class' array key instead of 'class' for class name specification.

  • XCache and Zend data cache support was removed. Switch to another caching backends.

  • Rename InvalidParamException usage to InvalidArgumentException.

  • CAPTCHA package has been moved into separate extension https://github.com/yiisoft/yii-captcha. Include it in your composer.json if you use it.

  • JQuery related code (e.g. yii.js, yiiActiveForm.js, yiiGridView.js) has been moved into separate extension https://github.com/yiisoft/yii-jquery. Include it in your composer.json if you use it.

  • REST API package has been moved into separate extension https://github.com/yiisoft/yii-rest. Include it in your composer.json if you use it.

  • MSSQL Server DB package has been moved into separate extension https://github.com/yiisoft/yii-mssql. Include it in your composer.json if you use it.

  • Oracle DB package has been moved into separate extension https://github.com/yiisoft/yii-oracle. Include it in your composer.json if you use it.

  • CUBRID support has been removed, package Yiisoft\Db\cubrid\* is no longer available. If you need to use CUBRID further you should create your own integration for it.

  • Masked input field widget was moved into separate extension https://github.com/yiisoft/yii-masked-input. Include it in your composer.json if you use it.

  • PJAX support has been removed: widget yii\widget\Pjax, method yii\web\Request::getIsPjax(), PJAX related checks and headers are no longer available. If you wish to use PJAX further you should create your own integration for it.

  • If you've used ApcCache and set useApcu in your config, remove the option.

  • During mail view rendering the $message variable is no longer set by default to be an instance of yii\mail\MessageInterface. Instead it is available via $this->context->message expression.

  • yii\mail\BaseMailer::render() method has been removed. Make sure you do not use it anywhere in your program. Mail view rendering is now encapsulated into yii\mail\Template class.

  • Properties view, viewPath, htmlLayout and textLayout have been moved from yii\mail\BaseMailer to yii\mail\Composer class, which now encapsulates message composition.

  • Interface of Yiisoft\Log\Logger has been changed according to PSR-3 Psr\Log\LoggerInterface. Make sure you update your code accordingly in case you invoke Logger methods directly.

  • Constants Yiisoft\Log\Logger::LEVEL_ERROR, Yiisoft\Log\Logger::LEVEL_WARNING and so on have been removed. Use constants from Psr\Log\LogLevel instead.

  • Method yii\BaseYii::trace() has been renamed to debug(). Make sure you use correct name for it.

  • Class Yiisoft\Log\Dispatcher has been removed as well as application 'log' component. Log targets now should be configured using yii\base\Application::$logger property. Neither 'log' or 'logger' components should be present at yii\base\Application::$bootstrap

  • Profiling related functionality has been extracted into a separated component under yii\profile\ProfilerInterface. Profiling messages should be collection using yii\base\Application::$profiler. In case you wish to continue storing profiling messages along with the log ones, you may use yii\profile\LogTarget profiling target.

  • Classes yii\web\Request and yii\web\Response have been updated to match interfaces Psr\Http\Message\ServerRequestInterface and Psr\Http\Message\ResponseInterface accordingly. Make sure you use their methods and properties correctly. In particular: method getHeaders() and corresponding virtual property $headers are no longer return HeaderCollection instance, you can use getHeaderCollection() in order to use old headers setup syntax; Request|Response::$version renamed to Request|Response::$protocolVersion; Response::$statusText renamed Response::$reasonPhrase; Request::$bodyParams renamed to Request::$parsedBody; Request::getBodyParam() renamed to Request::getParsedBodyParam();

  • yii\web\Response::$stream is no longer available, use yii\web\Response::withBody() to setup stream response. You can use Response::$bodyRange to setup stream content range.

  • Classes yii\web\CookieCollection, yii\web\HeaderCollection and yii\web\UploadedFile have been moved under namespace yii\http\*. Make sure to refer to those classes using correct fully qualified name.

  • Public interface of UploadedFile class has been changed according to Psr\Http\Message\UploadedFileInterface. Make sure you refer to its properties and methods with correct names.

  • Yiisoft\Yii\Captcha\CaptchaAction has been refactored. Rendering logic was extracted into Yiisoft\Yii\Captcha\DriverInterface, which instance is available via Yiisoft\Yii\Captcha\CaptchaAction::$driver field. All image settings now should be passed to the driver fields instead of action. Automatic detection of the rendering driver is no longer supported.

  • Yiisoft\Yii\Captcha\Captcha::checkRequirements() method has been removed.

  • All cache related classes interface has been changed according to PSR-16 "Simple Cache" specification. Make sure you change your invocations for the cache methods accordingly. The most notable changes affects methods get() and getMultiple() as they now accept $default argument, which value will be returned in case there is no value in the cache. This makes the default return value to be null instead of false.

  • Particular cache implementation should now be configured as yii\caching\Cache::$handler property instead of the component itself. Properties $defaultTtl, $serializer and $keyPrefix has been moved to cache handler and should be configured there. Creating your own cache implementation you should implement \Psr\SimpleCache\CacheInterface or extend yii\caching\SimpleCache abstract class. Use yii\caching\CacheInterface only if you wish to replace yii\caching\Cache component providing your own solution for cache dependency handling.

  • yii\caching\SimpleCache::$serializer now should be yii\serialize\SerializerInterface instance or its DI compatible configuration. Thus it does no longer accept pair of serialize/unserialize functions as an array. Use yii\serialize\CallbackSerializer or other predefined serializer class from yii\serialize\* namespace instead.

  • Console command used to clear cache now calls related actions "clear" instead of "flush".

  • Yii autoloader was removed in favor of Composer-generated one. You should remove explicit inclusion of Yii.php from your entry index.php scripts. In case you have relied on class map, use composer.json instead of configuring it with PHP. For details please refer to guide on autoloading, guide on customizing helpers and guide on Working with Third-Party Code.

  • The signature of yii\web\RequestParserInterface::parse() was changed. The method now accepts the yii\web\Request instance as a sole argument. Make sure you declare and implement this method correctly, while creating your own request parser.

  • Uploaded file retrieve methods have been moved from yii\http\UploadedFile to yii\web\Request. You should use Request::getUploadedFileByName() instead of UploadedFile::getInstanceByName() and Request::getUploadedFilesByName() instead of UploadedFile::getInstancesByName(). Instead of UploadedFile::getInstance() and UploadedFile::getInstances() use construction $model->load(Yii::$app->request->getUploadedFiles()).

  • Result of yii\web\Request::getBodyParams() now includes uploaded files (e.g. result of yii\web\Request::getUploadedFiles()). You should aware that instances of yii\http\UploadedFile may appear inside body params.

  • The following method signature have changed. If you override any of them in your code, you have to adjust these places: Yiisoft\Db\QueryBuilder::buildGroupBy($columns) -> buildGroupBy($columns, &$params) Yiisoft\Db\QueryBuilder::buildOrderByAndLimit($sql, $orderBy, $limit, $offset) -> buildOrderByAndLimit($sql, $orderBy, $limit, $offset, &$params) yii\widgets\ActiveField::hint($content = null, $options = []) yii\base\View::renderDynamic($statements) -> yii\base\View::renderDynamic($statements, array $params = [])

  • yii\filters\AccessControl has been optimized by only instantiating rules at the moment of use. This could lead to a potential BC-break if you are depending on $rules to be instantiated in init().

  • yii\widgets\BaseListView::run() and yii\widgets\GridView::run() now return content, instead of echoing it. Normally we call BaseListView::widget() and for this case behavior is NOT changed. In case you call ::run() method, ensure that its return is processed correctly.

  • yii\web\UrlNormalizer is now enabled by default in yii\web\UrlManager. If you are using yii\web\Request::resolve() or yii\web\UrlManager::parseRequest() directly, make sure that all potential exceptions are handled correctly or set yii\web\UrlNormalizer::$normalizer to false to disable normalizer.

  • yii\base\InvalidParamException was renamed to yii\base\InvalidArgumentException.

  • Classes yii\widgets\ActiveForm, yii\widgets\ActiveField, yii\grid\GridView, yii\web\View have been refactored to be more generic without including any 'JQuery' support and client-side processing (validation, automatic submit etc.). You should use widget behaviors from Yiisoft\Yii\JQuery\* package to make old code function as before. E.g. attach Yiisoft\Yii\JQuery\ActiveFormClientScript to yii\widgets\ActiveForm, Yiisoft\Yii\JQuery\GridViewClientScript to yii\grid\GridView and so on.

  • Fields $enableClientScript and $attributes have been removed from yii\widgets\ActiveForm. Make sure you do not use them or specify them during ActiveForm::begin() invocation.

  • Field yii\grid\GridView::$filterSelector has been removed. Make sure you do not use it or specify it during GridView::widget() invocation. Use Yiisoft\Yii\JQuery\GridViewClientScript::$filterSelector instead.

  • Method getClientOptions() has been removed from yii\validators\Validator and all its descendants. All implementations of clientValidateAttribute() around built-in validators now return null. Use classes from Yiisoft\Yii\JQuery\Validators\Client\* for building client validation (JavaScript) code.

  • Assets yii\web\JqueryAsset, yii\web\YiiAsset, yii\validators\ValidationAsset have been moved under Yiisoft\Yii\JQuery\* namespace. Make sure you refer to the new full-qualified names of this classes.

  • Methods yii\validators\Validator::formatMessage(), yii\validators\IpValidator::getIpParsePattern() and yii\validators\FileValidator::buildMimeTypeRegexp() have been made public. Make sure you use correct access level specification in case you override these methods.

  • Default script position for the yii\web\View::registerJs() changed to View::POS_END.

  • Package "ezyang/htmlpurifier" has been made optional and is not installed by default. If you need to use yii\helpers\HtmlPurifier or yii\i18n\Formatter::asHtml() (e.g. 'html' data format), you'll have to install this package manually for your project.

  • yii\BaseYii::powered() method has been removed. Please add "Powered by Yii" link either right into HTML or using yii\helpers\Html::a().

  • Public interface of the yii\base\Event class have been changed to match commonly used event notations. Field $sender converted into virtual property $target, field $data converted into virtual property $params. Public field $handled has been removed - use methods stopPropagation() and isPropagationStopped() instead.

  • Signature of the methods yii\base\Component::trigger() and yii\base\Event::trigger() has been changed, removing $name argument and allowing $event to be a string event name. Make sure you invoke these methods correctly and apply new signature in case you override them.

  • yii\i18n\MessageFormatter no longer supports parameter names with ., -, = and other symbols that are used in pattern syntax following directly how it works in intl/ICU. If you use such parameters names, replace special symbols with _.

  • yii\i18n\MessageFormatter::parse() method was removed. If you have a rare case where it's used copy-paste it from 2.0 branch to your project.

  • yii\helpers\Markdown was removed. Use cebe/markdown composer package directly.

  • yii\helpers\FileHelper now always uses / as normalized directory separator regardless of operating system used. Adjust your code that work with paths if needed.

  • Ability to truncate content taking HTML into account was removed from StringHelper in favor of HtmlPurifier helper.