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<?php/*** CodeIgniter** An open source application development framework for PHP** This content is released under the MIT License (MIT)** Copyright (c) 2014 - 2016, British Columbia Institute of Technology** Permission is hereby granted, free of charge, to any person obtaining a copy* of this software and associated documentation files (the "Software"), to deal* in the Software without restriction, including without limitation the rights* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell* copies of the Software, and to permit persons to whom the Software is* furnished to do so, subject to the following conditions:** The above copyright notice and this permission notice shall be included in* all copies or substantial portions of the Software.** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN* THE SOFTWARE.** @package CodeIgniter* @author EllisLab Dev Team* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)* @license http://opensource.org/licenses/MIT MIT License* @link https://codeigniter.com* @since Version 2.0.0* @filesource*/defined('BASEPATH') OR exit('No direct script access allowed');/*** CodeIgniter Caching Class** @package CodeIgniter* @subpackage Libraries* @category Core* @author EllisLab Dev Team* @link*/class CI_Cache extends CI_Driver_Library {/*** Valid cache drivers** @var array*/protected $valid_drivers = array('apc','dummy','file','memcached','redis','wincache');/*** Path of cache files (if file-based cache)** @var string*/protected $_cache_path = NULL;/*** Reference to the driver** @var mixed*/protected $_adapter = 'dummy';/*** Fallback driver** @var string*/protected $_backup_driver = 'dummy';/*** Cache key prefix** @var string*/public $key_prefix = '';/*** Constructor** Initialize class properties based on the configuration array.** @param array $config = array()* @return void*/public function __construct($config = array()){isset($config['adapter']) && $this->_adapter = $config['adapter'];isset($config['backup']) && $this->_backup_driver = $config['backup'];isset($config['key_prefix']) && $this->key_prefix = $config['key_prefix'];// If the specified adapter isn't available, check the backup.if ( ! $this->is_supported($this->_adapter)){if ( ! $this->is_supported($this->_backup_driver)){// Backup isn't supported either. Default to 'Dummy' driver.log_message('error', 'Cache adapter "'.$this->_adapter.'" and backup "'.$this->_backup_driver.'" are both unavailable. Cache is now using "Dummy" adapter.');$this->_adapter = 'dummy';}else{// Backup is supported. Set it to primary.log_message('debug', 'Cache adapter "'.$this->_adapter.'" is unavailable. Falling back to "'.$this->_backup_driver.'" backup adapter.');$this->_adapter = $this->_backup_driver;}}}// ------------------------------------------------------------------------/*** Get** Look for a value in the cache. If it exists, return the data* if not, return FALSE** @param string $id* @return mixed value matching $id or FALSE on failure*/public function get($id){return $this->{$this->_adapter}->get($this->key_prefix.$id);}// ------------------------------------------------------------------------/*** Cache Save** @param string $id Cache ID* @param mixed $data Data to store* @param int $ttl Cache TTL (in seconds)* @param bool $raw Whether to store the raw value* @return bool TRUE on success, FALSE on failure*/public function save($id, $data, $ttl = 60, $raw = FALSE){return $this->{$this->_adapter}->save($this->key_prefix.$id, $data, $ttl, $raw);}// ------------------------------------------------------------------------/*** Delete from Cache** @param string $id Cache ID* @return bool TRUE on success, FALSE on failure*/public function delete($id){return $this->{$this->_adapter}->delete($this->key_prefix.$id);}// ------------------------------------------------------------------------/*** Increment a raw value** @param string $id Cache ID* @param int $offset Step/value to add* @return mixed New value on success or FALSE on failure*/public function increment($id, $offset = 1){return $this->{$this->_adapter}->increment($this->key_prefix.$id, $offset);}// ------------------------------------------------------------------------/*** Decrement a raw value** @param string $id Cache ID* @param int $offset Step/value to reduce by* @return mixed New value on success or FALSE on failure*/public function decrement($id, $offset = 1){return $this->{$this->_adapter}->decrement($this->key_prefix.$id, $offset);}// ------------------------------------------------------------------------/*** Clean the cache** @return bool TRUE on success, FALSE on failure*/public function clean(){return $this->{$this->_adapter}->clean();}// ------------------------------------------------------------------------/*** Cache Info** @param string $type = 'user' user/filehits* @return mixed array containing cache info on success OR FALSE on failure*/public function cache_info($type = 'user'){return $this->{$this->_adapter}->cache_info($type);}// ------------------------------------------------------------------------/*** Get Cache Metadata** @param string $id key to get cache metadata on* @return mixed cache item metadata*/public function get_metadata($id){return $this->{$this->_adapter}->get_metadata($this->key_prefix.$id);}// ------------------------------------------------------------------------/*** Is the requested driver supported in this environment?** @param string $driver The driver to test* @return array*/public function is_supported($driver){static $support;if ( ! isset($support, $support[$driver])){$support[$driver] = $this->{$driver}->is_supported();}return $support[$driver];}}