本来CI不支持memcache扩展，只支持memcahed 扩展，修改成
如果php module 加载 memcached 扩展，直接创建 memcahed 对象
如果php module 没加载 memcached 扩展，加载了 memcahe 扩展 ，直接创建 memcache 对象
虽然改成不是很大，但是解决了CI, memcache,memcached兼容问题~
代码如下：<?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), $ttl); } else if (get_class($this->_memcached) == 'Memcache') { return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl); } return FALSE; } // ------------------------------------------------------------------------ /** * Delete from Cache * * @param mixed key to be deleted. * @return boolean true on success, false on failure */ public function delete($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->_default_options['default_host']; //坑爹的原代码,没有_default_options属性 $cache_server['hostname'] = $this->_memcache_conf['default']['default_host']; } if ( ! array_key_exists('port', $cache_server)) { // $cache_server['port'] = $this->_default_options['default_port'];//坑爹的原代码,没有_default_options属性 $cache_server['port'] = $this->_memcache_conf['default']['default_port']; } if ( ! array_key_exists('weight', $cache_server)) { // $cache_server['weight'] = $this->_default_options['default_weight'];//坑爹的原代码,没有_default_options属性 $cache_server['weight'] = $this->_memcache_conf['default']['default_weight']; } //导 致如果不配置 config/memcache.php文件，执行 到$this->_memcached->addServer($cache_server['hostname'],$cache_server['port']); 出错（因为此时语句，相当于 $this->_memcached->addServer(‘’,'');然后机器木反应了~ if (extension_loaded('memcached')){ $this->_memcached->addServer( $cache_server['hostname'], $cache_server['port'], $cache_server['weight'] ); }else{ $this->_memcached->addServer($cache_server['hostname'],$cache_server['port'],TRUE, $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') && !extension_loaded('memcache')) { 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 */