CI memcache driver修改 for windows server

<?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 - 2012 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_memcached extends CI_Driver {

private $_memcached;	// Holds the memcached object

protected $_memcache_conf = array(
'default' => array(
'default_host'	 => '127.0.0.1',
'default_port'	 => 11211,
'default_weight'	=> 1
)
);

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

/**
* Fetch from cache
*
* @param mixed	 unique key id
* @return mixed	 data on success/false on failure
*/
public function get($id)
{
$data = $this->_memcached->get($id);

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

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

/**
* Save
*
* @param string	 unique identifier
* @param mixed	 data being cached
* @param int	 time to live
* @return boolean true on success, false on failure
*/
public function save($id, $data, $ttl = 60)
{
if (get_class($this->_memcached) == 'Memcached')
{
return $this->_memcached->set($id, array($data, time(), $ttl), $ttl);
}
<span style="color:#ff0000;">else if (get_class($this->_memcached) == 'Memcache')  //对于window环境添加Memcache判断
{
return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl);
}</span>

return FALSE;
}

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

/**
* Delete from Cache
*
* @param mixed	 key to be deleted.
* @return boolean true on success, false on failure
*/
public function delete($id)
{
return $this->_memcached->delete($id);
}

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

/**
* Clean the Cache
*
* @return boolean	 false on failure/true on success
*/
public function clean()
{
return $this->_memcached->flush();
}

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

/**
* Cache Info
*
* @param null	 type not supported in memcached
* @return mixed array on success, false on failure
*/
public function cache_info($type = NULL)
{
return $this->_memcached->getStats();
}

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

/**
* Get Cache Metadata
*
* @param mixed	 key to get cache metadata on
* @return mixed	 FALSE on failure, array on success.
*/
public function get_metadata($id)
{
$stored = $this->_memcached->get($id);

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

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

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

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

/**
* Setup memcached.
*/
private function _setup_memcached()
{
// Try to load memcached server info from the config file.
$CI =& get_instance();
if ($CI->config->load('memcached', TRUE, TRUE))
{
if (is_array($CI->config->config['memcached']))
{
$this->_memcache_conf = NULL;

foreach ($CI->config->config['memcached'] as $name => $conf)
{
$this->_memcache_conf[$name] = $conf;
}
}
}
if(extension_loaded('memcached')){
$this->_memcached = new Memcached();
}else{
$this->_memcached = new Memcache();
}

foreach ($this->_memcache_conf as $name => $cache_server)
{
if ( ! array_key_exists('hostname', $cache_server))
{
$cache_server['hostname'] = $this-><span style="color:#ff0000;">_memcache_conf['default']</span>['default_host']; //some strange error
}

if ( ! array_key_exists('port', $cache_server))
{
$cache_server['port'] = $this->_memcache_conf['default']['default_port'];
}

if ( ! array_key_exists('weight', $cache_server))
{
$cache_server['weight'] = $this->_memcache_conf['default']['default_weight'];
}

$this->_memcached->addServer(
$cache_server['hostname'], $cache_server['port'], $cache_server['weight']
);
}
}

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

/**
* Is supported
*
* Returns FALSE if memcached is not supported on the system.
* If it is, we setup the memcached object & return TRUE
*/
public function is_supported()
{
if ( ! extension_loaded('memcached') && <span style="color:#ff6666;">!extension_loaded('memcache'</span>)) //add for windows server
{
log_message('error', 'The Memcached Extension must be loaded to use Memcached Cache.');

return FALSE;
}

$this->_setup_memcached();
return TRUE;
}

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

}
// End Class

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