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一、CodeIgniter 下 memcached 使用问题

1、CodeIgniter 的 memcached 相关接口，用的是 Memcached 名称，而非 Pecl memcache 库的 Memcache 名称，所以无法加载，解决方法：

修改 System/libraries/Cache/drivers/Cache_memcached.php 文件，将

代码

$this->_memcached = new Memcached();

改成

代码

$this->_memcached = new Memcache();

代码

if ( ! extension_loaded('memcached'))

改成

代码

if ( ! extension_loaded('memcache'))

2、CodeIgniter 的 Memcache::add 封装有错（依然是 Memcached 的封装），没有正确定义 flag 参数位置，解决方法：

代码

/**
         * Save
         *
         * @param       string          unique identifier
         * @param       mixed           data being cached
+         * @param       int             flags
         * @param       int             time to live
         * @return      boolean         true on success, false on failure
         */
        public function save($id, $data, $ttl = 60)
        {
-                return $this->_memcached->add($id, array($data, time(), $ttl), $ttl);
+                return $this->_memcached->add($id, array($data, time(), $ttl), false, $ttl);
        }

3、CodeIgniter 没有设置 set 和 replace 入口，解决方法：

代码

+        /**
+    // ------------------------------------------------------------------------
+
+    /**
+     * Set
+     *
+     * @param     string        unique identifier
+     * @param     mixed        data being cached
+     * @param     int        flags
+     * @param     int        time to live
+     * @return     boolean     true on success, false on failure
+     */
+    public function set($id, $data, $ttl = 60)
+    {
+        return $this->_memcached->set($id, array($data, time(), $ttl), false, $ttl);
+    }
+
+    // ------------------------------------------------------------------------
+
+    /**
+         * Replace
+         *
+         * @param       string          unique identifier
+         * @param       mixed           data being cached
+         * @param       int             flags
+         * @param       int             time to live
+         * @return      boolean         true on success, false on failure
+         */
+        public function replace($id, $data, $ttl = 60)
+        {
+                return $this->_memcached->replace($id, array($data, time(), $ttl), false, $ttl);
+        }
+
+        // ------------------------------------------------------------------------
+
        /**
         * Delete from Cache
         *
         * @param       mixed           key to be deleted.
         * @return      boolean         true on success, false on failure
         */
        public function delete($id)
        {
                return $this->_memcached->delete($id);
        }

4、CodeIgniter 没有正确解析永久连接，解决方法：

代码

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

+                        if ( ! array_key_exists('persistent', $cache_server))
+                        {
+                                $cache_server['persistent'] = TRUE;
+                        }
+
                        if ( ! array_key_exists('weight', $cache_server))
                        {
                                $cache_server['weight'] = $this->_default_options['default_weight'];
                        }

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

最后，是 CodeIgniter 的 memcache 的配置文件格式：

代码

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
$config['default']['hostname'] = 'unix:///var/run/memcached.sock';
$config['default']['port'] = 0;
$config['default']['persistent'] = TRUE;
$config['default']['weight'] = 1;