11-php-di-4-3-released.md

layout	title	author	date
blogpost	PHP-DI 4.3 released	Matthieu Napoli	August 12th 2014

I am happy to announce that PHP-DI version 4.3 has been released. This version contains features that have all been implemented by contributors other than me, this is very encouraging :) This is also the quickest release, since 4.2 was released only 14 days ago.

It comes without any BC break, and with a new main feature: DI\env() to import environment variables.

DI\env()

contributed by @jmalloc

If you use environment variables, you might end up creating several container definitions looking like this:

return [

    'db.url' => DI\factory(
        function (DI\Container $container) {
            return isset($_SERVER['DATABASE_URL'])
                ? $_SERVER['DATABASE_URL']
                : 'postgresql://user:pass@localhost/db';
        }
    )

];

This might be a common situation for some developers, especially those deploying their applications to systems like Heroku, or otherwise following the principles of 12-factor applications.

Since 4.3, this can be written like this:

return [
    'db.url' => DI\env('DATABASE_URL', 'postgresql://user:pass@localhost/db'),
];

The first parameter to DI\env() is the name of the environment variable to read, the second parameter is the default value to use if the environment variable is not defined.

If the environment variable is not defined and no default is provided, a DefinitionException is thrown when attempting to resolve the value.

Finally, default values can reference other definitions using DI\link():

return [
    'default-dsn' => 'postgresql://user:pass@localhost/db',
    'dsn' => DI\env('DATABASE_URL', DI\link('default-dsn')),
];

Container::call() resolves array callable using class name

contributed by @thispagecannotbefound

This change will allow you to call an array callable using a class name, like so:

$container->call(['MyClass', 'method']);

If the method is not static, MyClass will be resolved using the container.

Don't know what Container::call() is? Check out the "Container API" documentation.

FactoryInterface and InvokerInterface are auto-registered

contributed by @drealecs

Before 4.3, if you wanted to inject DI\FactoryInterface or DI\InvokerInterface, you needed to bind them in the configuration to DI\Container.

They are now auto-registered (just like DI\ContainerInterface) as links to DI\Container so that you can inject them without any configuration.

If you had previously defined them, there is no problem: your definitions always override the internal ones.

Don't know what these interfaces are for? Check out the "Container API" documentation.

Change log

You can read the complete change log.