增加session memcache驱动

library/think/Session.php

@@ -85,7 +85,7 @@ class Session
             $class = (!empty($config['namespace']) ? $config['namespace'] : '\\think\\session\\driver\\') . ucwords($config['type']);
 
             // 检查驱动类
-            if (!class_exists($class) || !session_set_save_handler(new $class())) {
+            if (!class_exists($class) || !session_set_save_handler(new $class($conifg))) {
                 throw new \think\Exception('error session handler', 11700);
             }
         }

library/think/session/driver/Memcache.class.php

@@ -0,0 +1,81 @@
+<?php
+namespace think\session\driver;
+
+use think\session\Driver;
+use think\Config;
+
+class Memcache extends Driver
+{
+    protected $handle       = null;
+    protected $config       = [
+        'expire'        => 3600,                // 有效期
+        'timeout'       => 1,                   // 超时时间
+        'persistent'    => 0,                   // 是否长连接
+        'connections'   => '127.0.0.1:11211',   // 服务器连接配置 OR ['127.0.0.1:11211', '127.0.0.1:11212']
+        'session_name'  => '',                  // memcache key前缀
+    ];
+
+    /**
+     * 打开Session 
+     * @access public 
+     * @param string $savePath 
+     * @param mixed $sessName  
+     */
+    public function open($savePath, $sessName) {
+        $this->handle       = new \Memcache;
+        $connections        = is_array($connections) ? $connections : explode(',', $connections);
+        foreach ($connections as $connection) {
+            list($host, $port)  = explode(':', $connection);
+            $this->handle->addServer($host, $port, $this->config['persistent'], 1, $this->config['timeout']);
+        }
+        return true;
+    }
+
+    /**
+     * 关闭Session 
+     * @access public 
+     */
+    public function close() {
+        $this->gc(ini_get('session.gc_maxlifetime'));
+        $this->handle->close();
+        $this->handle       = null;
+        return true;
+    }
+
+    /**
+     * 读取Session 
+     * @access public 
+     * @param string $sessID 
+     */
+    public function read($sessID) {
+        return $this->handle->get($this->config['session_name'].$sessID);
+    }
+
+    /**
+     * 写入Session 
+     * @access public 
+     * @param string $sessID 
+     * @param String $sessData  
+     */
+    public function write($sessID, $sessData) {
+        return $this->handle->set($this->config['session_name'].$sessID, $sessData, 0, $this->config['expire']);
+    }
+
+    /**
+     * 删除Session 
+     * @access public 
+     * @param string $sessID 
+     */
+    public function destroy($sessID) {
+        return $this->handle->delete($this->config['session_name'].$sessID);
+    }
+
+    /**
+     * Session 垃圾回收
+     * @access public 
+     * @param string $sessMaxLifeTime 
+     */
+    public function gc($sessMaxLifeTime) {
+        return true;
+    }
+}