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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_Function extends Zend_Cache_Core
 {
     /**
      * This frontend specific options
      *
      * ====> (boolean) cache_by_default :
      * - if true, function calls will be cached by default
      *
      * ====> (array) cached_functions :
      * - an array of function names which will be cached (even if cache_by_default = false)
      *
      * ====> (array) non_cached_functions :
      * - an array of function names which won't be cached (even if cache_by_default = true)
      *
      * @var array options
      */
     protected $_specificOptions = array(
         'cache_by_default' => true,
         'cached_functions' => array(),
         'non_cached_functions' => array()
     );
 
     /**
      * Constructor
      *
      * @param  array $options Associative array of options
      * @return void
      */
     public function __construct(array $options = array())
     {
         foreach ($options as $name => $value) {
             $this->setOption($name, $value);
         }
         $this->setOption('automatic_serialization', true);
     }
 
     /**
      * Main method : call the specified function or get the result from cache
      *
      * @param  callback $callback         A valid callback
      * @param  array    $parameters       Function parameters
      * @param  array    $tags             Cache tags
      * @param  int      $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
      * @param  int      $priority         integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
      * @return mixed Result
      */
     public function call($callback, array $parameters = array(), $tags = array(), $specificLifetime = false, $priority = 8)
     {
         if (!is_callable($callback, true, $name)) {
             Zend_Cache::throwException('Invalid callback');
         }
 
         $cacheBool1 = $this->_specificOptions['cache_by_default'];
         $cacheBool2 = in_array($name, $this->_specificOptions['cached_functions']);
         $cacheBool3 = in_array($name, $this->_specificOptions['non_cached_functions']);
         $cache = (($cacheBool1 || $cacheBool2) && (!$cacheBool3));
         if (!$cache) {
             // Caching of this callback is disabled
             return call_user_func_array($callback, $parameters);
         }
 
         $id = $this->_makeId($callback, $parameters);
         if ( ($rs = $this->load($id)) && isset($rs[0], $rs[1])) {
             // A cache is available
             $output = $rs[0];
             $return = $rs[1];
         } else {
             // A cache is not available (or not valid for this frontend)
             ob_start();
             ob_implicit_flush(false);
             $return = call_user_func_array($callback, $parameters);
             $output = ob_get_clean();
             $data = array($output, $return);
             $this->save($data, $id, $tags, $specificLifetime, $priority);
         }
 
         echo $output;
         return $return;
     }
 
     /**
      * ZF-9970
      *
      * @deprecated
      */
     private function _makeId($callback, array $args)
     {
         return $this->makeId($callback, $args);
     }
 
     /**
      * Make a cache id from the function name and parameters
      *
      * @param  callback $callback A valid callback
      * @param  array    $args     Function parameters
      * @throws Zend_Cache_Exception
      * @return string Cache id
      */
     public function makeId($callback, array $args = array())
     {
         if (!is_callable($callback, true, $name)) {
             Zend_Cache::throwException('Invalid callback');
         }
 
         // functions, methods and classnames are case-insensitive
         $name = strtolower($name);
 
         // generate a unique id for object callbacks
         if (is_object($callback)) { // Closures & __invoke
             $object = $callback;
         } elseif (isset($callback[0])) { // array($object, 'method')
             $object = $callback[0];
         }
         if (isset($object)) {
             try {
                 $tmp = @serialize($callback);
             } catch (Exception $e) {
                 Zend_Cache::throwException($e->getMessage());
             }
             if (!$tmp) {
                 $lastErr = error_get_last();
                 Zend_Cache::throwException("Can't serialize callback object to generate id: {$lastErr['message']}");
             }
             $name.= '__' . $tmp;
         }
 
         // generate a unique id for arguments
         $argsStr = '';
         if ($args) {
             try {
                 $argsStr = @serialize(array_values($args));
             } catch (Exception $e) {
                 Zend_Cache::throwException($e->getMessage());
             }
             if (!$argsStr) {
                 $lastErr = error_get_last();
                 throw Zend_Cache::throwException("Can't serialize arguments to generate id: {$lastErr['message']}");
             }
         }
 
         return md5($name . $argsStr);
     }
 
 }