DependencyInjection Component

DependencyInjection manages your services via a robust and flexible Dependency Injection Container.

Here is a simple example that shows how to register services and parameters:

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;

$sc = new ContainerBuilder();
$sc
    ->register('foo', '%foo.class%')
    ->addArgument(new Reference('bar'))
;
$sc->setParameter('foo.class', 'Foo');

$sc->get('foo');

Resources

Unit tests:

https://github.com/symfony/symfony/tree/master/tests/Symfony/Tests/Component/DependencyInjection