<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 4.3.2 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2006 - 2011 EllisLab, Inc. * @license http://codeigniter.com/user_guide/license.html * @link http://codeigniter.com * @since Version 2.0 * @filesource */ // ------------------------------------------------------------------------ /** * CodeIgniter Memcached Caching Class * * @package CodeIgniter * @subpackage Libraries * @category Core * @author ExpressionEngine Dev Team * @link */ class CI_Cache_file extends CI_Driver { protected $_cache_path; /** * Constructor */ public function __construct() { $CI =& get_instance(); $CI->load->helper('file'); $path = $CI->config->item('cache_path'); $this->_cache_path = ($path == '') ? APPPATH.'cache/' : $path; } // ------------------------------------------------------------------------ /** * Fetch from cache * * @param mixed unique key id * @return mixed data on success/false on failure */ public function get($id) { if ( ! file_exists($this->_cache_path.$id)) { return FALSE; } $data = read_file($this->_cache_path.$id); $data = unserialize($data); if (time() > $data['time'] + $data['ttl']) { unlink($this->_cache_path.$id); return FALSE; } return $data['data']; } // ------------------------------------------------------------------------ /** * Save into cache * * @param string unique key * @param mixed data to store * @param int length of time (in seconds) the cache is valid * - Default is 60 seconds * @return boolean true on success/false on failure */ public function save($id, $data, $ttl = 60) { $contents = array( 'time' => time(), 'ttl' => $ttl, 'data' => $data ); if (write_file($this->_cache_path.$id, serialize($contents))) { @chmod($this->_cache_path.$id, 0777); return TRUE; } return FALSE; } // ------------------------------------------------------------------------ /** * Delete from Cache * * @param mixed unique identifier of item in cache * @return boolean true on success/false on failure */ public function delete($id) { return unlink($this->_cache_path.$id); } // ------------------------------------------------------------------------ /** * Clean the Cache * * @return boolean false on failure/true on success */ public function clean() { return delete_files($this->_cache_path); } // ------------------------------------------------------------------------ /** * Cache Info * * Not supported by file-based caching * * @param string user/filehits * @return mixed FALSE */ public function cache_info($type = NULL) { return get_dir_file_info($this->_cache_path); } // ------------------------------------------------------------------------ /** * Get Cache Metadata * * @param mixed key to get cache metadata on * @return mixed FALSE on failure, array on success. */ public function get_metadata($id) { if ( ! file_exists($this->_cache_path.$id)) { return FALSE; } $data = read_file($this->_cache_path.$id); $data = unserialize($data); if (is_array($data)) { $mtime = filemtime($this->_cache_path.$id); if ( ! isset($data['data']['ttl'])) { return FALSE; } return array( 'expire' => $mtime + $data['data']['ttl'], 'mtime' => $mtime ); } return FALSE; } // ------------------------------------------------------------------------ /** * Is supported * * In the file driver, check to see that the cache directory is indeed writable * * @return boolean */ public function is_supported() { return is_really_writable($this->_cache_path); } // ------------------------------------------------------------------------ } // End Class /* End of file Cache_file.php */ /* Location: ./system/libraries/Cache/drivers/Cache_file.php */