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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_Frontend
  * @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    $Id$
  */
 
 
 /**
  * @see Zend_Cache_Core
  */
 // require_once 'Zend/Cache/Core.php';
 
 
 /**
  * @package    Zend_Cache
  * @subpackage Zend_Cache_Frontend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Cache_Frontend_Output extends Zend_Cache_Core
 {
 
     private $_idStack = array();
 
     /**
      * Constructor
      *
      * @param  array $options Associative array of options
      * @return void
      */
     public function __construct(array $options = array())
     {
         parent::__construct($options);
         $this->_idStack = array();
     }
 
     /**
      * Start the cache
      *
      * @param  string  $id                     Cache id
      * @param  boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
      * @param  boolean $echoData               If set to true, datas are sent to the browser if the cache is hit (simply returned else)
      * @return mixed True if the cache is hit (false else) with $echoData=true (default) ; string else (datas)
      */
     public function start($id, $doNotTestCacheValidity = false, $echoData = true)
     {
         $data = $this->load($id, $doNotTestCacheValidity);
         if ($data !== false) {
             if ( $echoData ) {
                 echo($data);
                 return true;
             } else {
                 return $data;
             }
         }
         ob_start();
         ob_implicit_flush(false);
         $this->_idStack[] = $id;
         return false;
     }
 
     /**
      * Stop the cache
      *
      * @param  array   $tags             Tags array
      * @param  int     $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
      * @param  string  $forcedDatas      If not null, force written datas with this
      * @param  boolean $echoData         If set to true, datas are sent to the browser
      * @param  int     $priority         integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
      * @return void
      */
     public function end($tags = array(), $specificLifetime = false, $forcedDatas = null, $echoData = true, $priority = 8)
     {
         if ($forcedDatas === null) {
             $data = ob_get_clean();
         } else {
             $data =& $forcedDatas;
         }
         $id = array_pop($this->_idStack);
         if ($id === null) {
             Zend_Cache::throwException('use of end() without a start()');
         }
         $this->save($data, $id, $tags, $specificLifetime, $priority);
         if ($echoData) {
             echo($data);
         }
     }
 
 }