Cache_XCache Driver for CodeIgniter, from https://bitbucket.org/ellislab/codeigniter-reactor/issue/39/cache_xcache-driver

Cache_xcache.php

<?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 XCache Caching Class
 *
 * NOTE:
 *  At the moment, It is not possible to store resources, callbacks or objects using xcache_* functions. 
 *  http://xcache.lighttpd.net/wiki/XcacheApi)
 *  Because of that, this class uses the (un-)serialize() -functions to store the data internally
 * 
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		Timo Hoen
 * @link
 */

class Cache_xcache extends CI_Driver {

	/**
	 * Fetch from Cache
	 * 
	 * @param 	string
	 
	 * @return 	mixed
	 */
	public function get($id)
	{
		if (! xcache_isset($id))
			return FALSE;

		return unserialize(xcache_get($id));
	}

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

	/**
	 * Cache Save
	 *
	 * @param 	string		Unique Key
	 * @param 	mixed		Data to store
	 * @param 	int			Length of time (in seconds) to cache the data
	 *
	 * @return 	boolean
	 */
	public function save($id, $data, $ttl = 60)
	{
		return xcache_set($id, serialize($data),$ttl);
	}

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

	/**
	 * Delete from Cache
	 *
	 * @param 	mixed		unique identifier of the item in the cache
	 * @param 	boolean
	 */
	public function delete($id)
	{
		return xcache_unset($id);
	}

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

	/**
	 * Not yet implemented
	 *
	 * @return 	boolean		
	 */
	public function clean()
	{
		return FALSE;
	}

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

	/**
	 * Not yet implemented
	 *
	 * @param 	string		user/filehits
	 * @return 	boolean		FALSE
	 */
	 public function cache_info($type = NULL)
	 {
		 return FALSE;
	 }

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

	/**
	 * Not yet implemented
	 * 
	 * @param 	mixed		key to get cache metadata on
	 * @return 	boolean		FALSE
	 */
	public function get_metadata($id)
	{
		return FALSE;
	}

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

	/**
	 * Is this caching driver supported on the system?
	 * 
	 *
	 * @return TRUE;
	 */
	public function is_supported()
	{
		if ( ! extension_loaded('xcache'))
		{
			log_message('error', 'The XCache PHP extension must be loaded to use XCache.');
			return FALSE;
		}
		
		
		if ( ! function_exists('serialize'))
		{
			log_message('error', 'The serialize function is not available.');
			return FALSE;
		}
		
		return TRUE;
	}

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

}
// End Class

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