system/libraries/Cache/drivers/Cache_apc.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * 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) 2006 - 2012 EllisLab, Inc.
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 2.0
 * @filesource
 */

/**
 * CodeIgniter APC Caching Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		EllisLab Dev Team
 * @link
 */
class CI_Cache_apc extends CI_Driver {

	/**
	 * Get
	 *
	 * Look for a value in the cache. If it exists, return the data
	 * if not, return FALSE
	 *
	 * @param	string
	 * @return	mixed	value that is stored/FALSE on failure
	 */
	public function get($id)
	{
		$data = apc_fetch($id);

		return is_array($data) ? $data[0] : FALSE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Cache Save
	 *
	 * @param	string	Unique Key
	 * @param	mixed	Data to store
	 * @param	int	Length of time (in seconds) to cache the data
	 *
	 * @return	bool	true on success/false on failure
	 */
	public function save($id, $data, $ttl = 60)
	{
		$ttl = (int) $ttl;
		return apc_store($id, array($data, time(), $ttl), $ttl);
	}

	// ------------------------------------------------------------------------

	/**
	 * Delete from Cache
	 *
	 * @param	mixed	unique identifier of the item in the cache
	 * @return	bool	true on success/false on failure
	 */
	public function delete($id)
	{
		return apc_delete($id);
	}

	// ------------------------------------------------------------------------

	/**
	 * Clean the cache
	 *
	 * @return	bool	false on failure/true on success
	 */
	public function clean()
	{
		return apc_clear_cache('user');
	}

	// ------------------------------------------------------------------------

	/**
	 * Cache Info
	 *
	 * @param	string	user/filehits
	 * @return	mixed	array on success, false on failure
	 */
	 public function cache_info($type = NULL)
	 {
		 return apc_cache_info($type);
	 }

	// ------------------------------------------------------------------------

	/**
	 * Get Cache Metadata
	 *
	 * @param	mixed	key to get cache metadata on
	 * @return	mixed	array on success/false on failure
	 */
	public function get_metadata($id)
	{
		$stored = apc_fetch($id);

		if (count($stored) !== 3)
		{
			return FALSE;
		}

		list($data, $time, $ttl) = $stored;

		return array(
			'expire'	=> $time + $ttl,
			'mtime'		=> $time,
			'data'		=> $data
		);
	}

	// ------------------------------------------------------------------------

	/**
	 * is_supported()
	 *
	 * Check to see if APC is available on this system, bail if it isn't.
	 *
	 * @return	bool
	 */
	public function is_supported()
	{
		if ( ! extension_loaded('apc') OR ! (bool) @ini_get('apc.enabled'))
		{
			log_message('error', 'The APC PHP extension must be loaded to use APC Cache.');
			return FALSE;
		}

		return TRUE;
	}

}

/* End of file Cache_apc.php */
/* Location: ./system/libraries/Cache/drivers/Cache_apc.php */