Parameter.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\DependencyInjection;


/**
 * Parameter represents a parameter reference.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class Parameter {
  private $id;

  /**
   * Constructor.
   *
   * @param string $id The parameter key
   */
  public function __construct($id) {
    $this->id = $id;
  }

  /**
   * __toString.
   *
   * @return string The parameter key
   */
  public function __toString() {
    return (string) $this->id;
  }

}