for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
<?php
namespace yii\di;
use Psr\Container\ContainerInterface;
use yii\di\contracts\DependencyInterface;
/**
* Class Reference allows us to define a dependency to a service in the container in another service definition.
* For example:
* ```php
* [
* InterfaceA::class => ConcreteA::class,
* 'alternativeForA' => ConcreteB::class,
* Service1::class => [
* '__construct()' => [
* Reference::to('alternativeForA')
* ]
* ```
*/
class Reference implements DependencyInterface
{
private $id;
private function __construct($id)
$this->id = $id;
}
public function getId(): string
return $this->id;
public static function to(string $id)
return new self($id);
* @param Container $container
public function resolve(ContainerInterface $container)
return $container->get($this->id);
yiisoft /
di
