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<?php
declare(strict_types=1);
namespace Yiisoft\Factory\Definition;
use Psr\Container\ContainerInterface;
use Yiisoft\Factory\Exception\InvalidConfigException;
use function is_string;
/**
* 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 ReferenceInterface
{
private string $id;
private function __construct(string $id)
$this->id = $id;
}
public function getId(): string
return $this->id;
public static function to($id): ReferenceInterface
if (!is_string($id)) {
throw new InvalidConfigException('Reference id must be string.');
return new self($id);
public function resolve(ContainerInterface $container)
return $container->get($this->id);
yiisoft /
factory
