Detailed explanation of distributed deployment examples of ThinkPHP project

    /* Memcache缓存设置 */
    'MEMCACHE_HOST'         => '192.168.202.20',
    'MEMCACHE_PORT'         => 11211,

    'DATA_CACHE_TYPE'       => 'Memcache',

    'SESSION_TYPE'          => 'Memcache',

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

defined(&#39;THINK_PATH&#39;) or exit();
/**
 * Memcache缓存驱动
 * @category   Extend
 * @package  Extend
 * @subpackage  Driver.Cache
 * @author    liu21st <liu21st@gmail.com>
 */
class CacheMemcache extends Cache {

    /**
     * 架构函数
     * @param array $options 缓存参数
     * @access public
     */
    function __construct($options=array()) {
        if ( !extension_loaded(&#39;memcache&#39;) ) {
            throw_exception(L(&#39;_NOT_SUPPERT_&#39;).&#39;:memcache&#39;);
        }

        $options = array_merge(array (
            &#39;host&#39;        =>  C(&#39;MEMCACHE_HOST&#39;) ? C(&#39;MEMCACHE_HOST&#39;) : &#39;127.0.0.1&#39;,
            &#39;port&#39;        =>  C(&#39;MEMCACHE_PORT&#39;) ? C(&#39;MEMCACHE_PORT&#39;) : 11211,
            &#39;timeout&#39;     =>  C(&#39;DATA_CACHE_TIMEOUT&#39;) ? C(&#39;DATA_CACHE_TIMEOUT&#39;) : false,
            &#39;persistent&#39;  =>  false,
        ),$options);

        $this->options      =   $options;
        $this->options[&#39;expire&#39;] =  isset($options[&#39;expire&#39;])?  $options[&#39;expire&#39;]  :   C(&#39;DATA_CACHE_TIME&#39;);
        $this->options[&#39;prefix&#39;] =  isset($options[&#39;prefix&#39;])?  $options[&#39;prefix&#39;]  :   C(&#39;DATA_CACHE_PREFIX&#39;);        
        $this->options[&#39;length&#39;] =  isset($options[&#39;length&#39;])?  $options[&#39;length&#39;]  :   0;        
        $func               =   $options[&#39;persistent&#39;] ? &#39;pconnect&#39; : &#39;connect&#39;;
        $this->handler      =   new Memcache;
        $options[&#39;timeout&#39;] === false ?
            $this->handler->$func($options[&#39;host&#39;], $options[&#39;port&#39;]) :
            $this->handler->$func($options[&#39;host&#39;], $options[&#39;port&#39;], $options[&#39;timeout&#39;]);
    }

    /**
     * 读取缓存
     * @access public
     * @param string $name 缓存变量名
     * @return mixed
     */
    public function get($name) {
        N(&#39;cache_read&#39;,1);
        return $this->handler->get($this->options[&#39;prefix&#39;].$name);
    }

    /**
     * 写入缓存
     * @access public
     * @param string $name 缓存变量名
     * @param mixed $value  存储数据
     * @param integer $expire  有效时间（秒）
     * @return boolen
     */
    public function set($name, $value, $expire = null) {
        N(&#39;cache_write&#39;,1);
        if(is_null($expire)) {
            $expire  =  $this->options[&#39;expire&#39;];
        }
        $name   =   $this->options[&#39;prefix&#39;].$name;
        if($this->handler->set($name, $value, 0, $expire)) {
            if($this->options[&#39;length&#39;]>0) {
                // 记录缓存队列
                $this->queue($name);
            }
            return true;
        }
        return false;
    }

    /**
     * 删除缓存
     * @access public
     * @param string $name 缓存变量名
     * @return boolen
     */
    public function rm($name, $ttl = false) {
        $name   =   $this->options[&#39;prefix&#39;].$name;
        return $ttl === false ?
            $this->handler->delete($name) :
            $this->handler->delete($name, $ttl);
    }

    /**
     * 清除缓存
     * @access public
     * @return boolen
     */
    public function clear() {
        return $this->handler->flush();
    }
}

<?php 
// +----------------------------------------------------------------------
// | 
// +----------------------------------------------------------------------
// | Copyright (c) 2013- 
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: richievoe <richievoe@163.com>
// +----------------------------------------------------------------------
    /**
     * 自定义Memcache来保存session
     */
Class SessionMemcache{
    //memcache对象
    private $mem;
    //SESSION有效时间
    private $expire;
    //外部调用的函数
    public function execute(){
        session_set_save_handler(
            array(&$this,&#39;open&#39;), 
            array(&$this,&#39;close&#39;), 
            array(&$this,&#39;read&#39;), 
            array(&$this,&#39;write&#39;), 
            array(&$this,&#39;destroy&#39;), 
            array(&$this,&#39;gc&#39;)
            );
    }
    //连接memcached和初始化一些数据
    public function open($path,$name){
        $this->expire = C(&#39;SESSION_EXPIRE&#39;) ? C(&#39;SESSION_EXPIRE&#39;) :ini_get(&#39;session.gc_maxlifetime&#39;);
        $this->mem = new Memcache;
        return $this->mem->connect(C(&#39;MEMCACHE_HOST&#39;), C(&#39;MEMCACHE_PORT&#39;));
    }
    //关闭memcache服务器
    public function close(){
        return $this->mem->close();
    }
    //读取数据
    public function read($id){
        $id = C(&#39;SESSION_PREFIX&#39;).$id;
        $data = $this->mem->get($id);
        return $data ? $data :&#39;&#39;;
    }
    //存入数据
    public function write($id,$data){
        $id = C(&#39;SESSION_PREFIX&#39;).$id;
        //$data = addslashes($data);
        return $this->mem->set($id,$data,0,$this->expire);
    }
    //销毁数据
    public function destroy($id){
        $id = C(&#39;SESSION_PREFIX&#39;).$id;
        return $this->mem->delete($id);
    }
    //垃圾销毁
    public function gc(){
        return true;
    }
}
?>