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Edit File: ResourceInterface.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\Config\Resource; /** * ResourceInterface is the interface that must be implemented by all Resource classes. * * @author Fabien Potencier <fabien@symfony.com> */ interface ResourceInterface { /** * Returns a string representation of the Resource. * * This method is necessary to allow for resource de-duplication, for example by means * of array_unique(). The string returned need not have a particular meaning, but has * to be identical for different ResourceInterface instances referring to the same * resource; and it should be unlikely to collide with that of other, unrelated * resource instances. */ public function __toString(); }