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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\DependencyInjection;
  13  
  14  /**
  15   * Parameter represents a parameter reference.
  16   *
  17   * @author Fabien Potencier <fabien@symfony.com>
  18   */
  19  class Parameter
  20  {
  21      private $id;
  22  
  23      /**
  24       * @param string $id The parameter key
  25       */
  26      public function __construct($id)
  27      {
  28          $this->id = $id;
  29      }
  30  
  31      /**
  32       * @return string The parameter key
  33       */
  34      public function __toString()
  35      {
  36          return (string) $this->id;
  37      }
  38  }