4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\DependencyInjection;
15 * Parameter represents a parameter reference.
17 * @author Fabien Potencier <fabien@symfony.com>
24 * @param string $id The parameter key
26 public function __construct($id)
32 * @return string The parameter key
34 public function __toString()
36 return (string) $this->id;