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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Cache
  * @subpackage Zend_Cache_Backend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @package    Zend_Cache
  * @subpackage Zend_Cache_Backend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 interface Zend_Cache_Backend_Interface
 {
     /**
      * Set the frontend directives
      *
      * @param array $directives assoc of directives
      */
     public function setDirectives($directives);
 
     /**
      * Test if a cache is available for the given id and (if yes) return it (false else)
      *
      * Note : return value is always "string" (unserialization is done by the core not by the backend)
      *
      * @param  string  $id                     Cache id
      * @param  boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
      * @return string|false cached datas
      */
     public function load($id, $doNotTestCacheValidity = false);
 
     /**
      * Test if a cache is available or not (for the given id)
      *
      * @param  string $id cache id
      * @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
      */
     public function test($id);
 
     /**
      * Save some string datas into a cache record
      *
      * Note : $data is always "string" (serialization is done by the
      * core not by the backend)
      *
      * @param  string $data            Datas to cache
      * @param  string $id              Cache id
      * @param  array $tags             Array of strings, the cache record will be tagged by each string entry
      * @param  int   $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
      * @return boolean true if no problem
      */
     public function save($data, $id, $tags = array(), $specificLifetime = false);
 
     /**
      * Remove a cache record
      *
      * @param  string $id Cache id
      * @return boolean True if no problem
      */
     public function remove($id);
 
     /**
      * Clean some cache records
      *
      * Available modes are :
      * Zend_Cache::CLEANING_MODE_ALL (default)    => remove all cache entries ($tags is not used)
      * Zend_Cache::CLEANING_MODE_OLD              => remove too old cache entries ($tags is not used)
      * Zend_Cache::CLEANING_MODE_MATCHING_TAG     => remove cache entries matching all given tags
      *                                               ($tags can be an array of strings or a single string)
      * Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}
      *                                               ($tags can be an array of strings or a single string)
      * Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags
      *                                               ($tags can be an array of strings or a single string)
      *
      * @param  string $mode Clean mode
      * @param  array  $tags Array of tags
      * @return boolean true if no problem
      */
     public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array());
 
 }