<?php /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * 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 * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 2.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * CodeIgniter File Caching Class * * @package CodeIgniter * @subpackage Libraries * @category Core * @author EllisLab Dev Team * @link */ class CI_Cache_file extends CI_Driver { /** * Directory in which to save cache files * * @var string */ protected $_cache_path; /** * Initialize file-based cache * * @return void */ 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; } $data = unserialize(file_get_contents($this->_cache_path.$id)); if ($data['ttl'] > 0 && time() > $data['time'] + $data['ttl']) { unlink($this->_cache_path.$id); return FALSE; } return $data['data']; } // ------------------------------------------------------------------------ /** * Save into cache * * @param string unique key * @param mixed data to store * @param int length of time (in seconds) the cache is valid * - Default is 60 seconds * @return bool true on success/false on failure */ public function save($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, 0660); return TRUE; } return FALSE; } // ------------------------------------------------------------------------ /** * Delete from Cache * * @param mixed unique identifier of item in cache * @return bool true on success/false on failure */ public function delete($id) { return file_exists($this->_cache_path.$id) ? unlink($this->_cache_path.$id) : FALSE; } // ------------------------------------------------------------------------ /** * Clean the Cache * * @return bool false on failure/true on success */ public function clean() { return delete_files($this->_cache_path, FALSE, TRUE); } // ------------------------------------------------------------------------ /** * 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; } $data = unserialize(file_get_contents($this->_cache_path.$id)); if (is_array($data)) { $mtime = filemtime($this->_cache_path.$id); if ( ! isset($data['ttl'])) { return FALSE; } return array( 'expire' => $mtime + $data['ttl'], 'mtime' => $mtime ); } return FALSE; } // ------------------------------------------------------------------------ /** * Is supported * * In the file driver, check to see that the cache directory is indeed writable * * @return bool */ public function is_supported() { return is_really_writable($this->_cache_path); } } /* End of file Cache_file.php */ /* Location: ./system/libraries/Cache/drivers/Cache_file.php */