<?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;

    }

}