thinkphp3.2.3用redis3.0.7做session共享

第一步：在主服务器(www服务器)和从服务器上安装redis3.0.7
【可以参考：http://my.oschina.net/u/2552286/blog/544287?fromerr=pPKzuHTG】

第二部：在www服务器上安装phpredis-2.2.7，
【可以参考：http://www.runoob.com/redis/redis-php.html】

第三部：配置redis
1、启动redis ：/home/redis-3.0.7/src/redis-servier /etc/redis/redis.conf
(我这里在本地做的测试，启动的时候随便指定了一个配置文件：/etc/redis/redis.conf ，如果是生产环境要正式部署，并把启动放在系统服务里面最好)

2、配置/etc/redis/redis.conf
①master服务器：
requirepass 123456789
②slave服务器：
requirepass 123456789
slaveof 192.168.1.248 6379

第四部：配置thinkphp
1、写一个Redis.class.php类放在TP根目录：/var/www/html/ThinkPHP/Library/Think/Session/Driver
感谢这位朋友分享：http://www.thinkphp.cn/extend/547.html

/**
 *  +----------------------------------------------------------------------
 *  | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
 *  +----------------------------------------------------------------------
 *  | Copyright (c) 2006-2013 http://thinkphp.cn All rights reserved.
 *  +----------------------------------------------------------------------
 *  | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
 *  +----------------------------------------------------------------------
 *  | @author guizhiming 
 *  +----------------------------------------------------------------------
 *  | @datetime 2014-4-1 14:11:24
 *  +---------------------------------------------------------------------- 
 */

namespace Think\Session\Driver;

/**
 * Redis Session驱动 
 * 要求安装phpredis扩展：https://github.com/nicolasff/phpredis
 * @category   Think
 * @package  Session
 * @subpackage  Driver
 * @author guizhiming 
 * @version   TP3.2~TP3.2.1
  +------------------------------------------------------------------------------
 */
class Redis {

    /**
     * Redis句柄
     */
    private $handler;
    private $get_result;

    public function __construct(){
        if ( !extension_loaded('redis') ) {
            E(L('_NOT_SUPPERT_').':redis');
        }
        if(empty($options)) {
            $options = array (
                'host'          => C('SESSION_REDIS_HOST') ? C('SESSION_REDIS_HOST') : '127.0.0.1',
                'port'          => C('SESSION_REDIS_PORT') ? C('SESSION_REDIS_PORT') : 6379,
                'timeout'       => C('SESSION_CACHE_TIME') ? C('SESSION_CACHE_TIME') : false,
                'persistent'    => C('SESSION_PERSISTENT') ? C('SESSION_PERSISTENT') : false,
                'auth'          => C('SESSION_REDIS_AUTH') ? C('SESSION_REDIS_AUTH') : false,
            );
        }
        $options['host'] = explode(',', $options['host']);
        $options['port'] = explode(',', $options['port']);
        $options['auth'] = explode(',', $options['auth']);
        foreach ($options['host'] as $key=>$value) {
            if (!isset($options['port'][$key])) {
                $options['port'][$key] = $options['port'][0];
            }
            if (!isset($options['auth'][$key])) {
                $options['auth'][$key] = $options['auth'][0];
            }
        }
        $this->options =  $options;
        $expire = C('SESSION_EXPIRE');
        $this->options['expire'] =  isset($expire) ? (int)$expire : (int)ini_get('session.gc_maxlifetime');;
        $this->options['prefix'] =  isset($options['prefix']) ?  $options['prefix']  :   C('SESSION_PREFIX');
        $this->handler  = new \Redis;
    }

    /**
     * 连接Redis服务端
     * @access public
     * @param bool $is_master : 是否连接主服务器
     */
    public function connect($is_master = true) {
        if ($is_master) {
            $i = 0;
        } else {
            $count = count($this->options['host']);
            if ($count == 1) {
                $i = 0;
            } else {
                $i = rand(1, $count - 1);   //多个从服务器随机选择
            }
        }
        $func = $this->options['persistent'] ? 'pconnect' : 'connect';
        try {
            if ($this->options['timeout'] === false) {
                $result = $this->handler->$func($this->options['host'][$i], $this->options['port'][$i]);
                if (!$result)
                    throw new \Think\Exception('Redis Error', 100);
            } else {
                $result = $this->handler->$func($this->options['host'][$i], $this->options['port'][$i], $this->options['timeout']);
                //dump($this->options);
                if (!$result){
                    throw new \Think\Exception('Redis Error', 101);
                    }
            }   
            if ($this->options['auth'][$i]) {
                $result = $this->handler->auth($this->options['auth'][$i]);
                if (!$result) {
                    throw new \Think\Exception('Redis Error', 102);
                }
            }
        } catch ( \Exception $e ) {
            exit('Error Message:'.$e->getMessage().'
Error Code:'.$e->getCode().'');
        }
    }

    /**
      +----------------------------------------------------------
     * 打开Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $savePath 
     * @param mixed $sessName  
      +----------------------------------------------------------
     */
    public function open($savePath, $sessName) {
        return true;
    }

    /**
      +----------------------------------------------------------
     * 关闭Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     */
    public function close() {
        if ($this->options['persistent'] == 'pconnect') {
            $this->handler->close();
        }
        return true;
    }

    /**
      +----------------------------------------------------------
     * 读取Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $sessID 
      +----------------------------------------------------------
     */
    public function read($sessID) {
        $this->connect(0);
        $this->get_result = $this->handler->get($this->options['prefix'].$sessID);
        return $this->get_result;
    }

    /**
      +----------------------------------------------------------
     * 写入Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $sessID 
     * @param String $sessData  
      +----------------------------------------------------------
     */
    public function write($sessID, $sessData) {
        if (!$sessData || $sessData == $this->get_result) {
            return true;
        }
        $this->connect(1);
        $expire  =  $this->options['expire'];
        $sessID   =   $this->options['prefix'].$sessID;
        if(is_int($expire) && $expire > 0) {
            $result = $this->handler->setex($sessID, $expire, $sessData);
            $re = $result ? 'true' : 'false';
        }else{
            $result = $this->handler->set($sessID, $sessData);
            $re = $result ? 'true' : 'false';
        }
        return $result;
    }

    /**
      +----------------------------------------------------------
     * 删除Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $sessID 
      +----------------------------------------------------------
     */
    public function destroy($sessID) {
        $this->connect(1);
        return $this->handler->delete($this->options['prefix'].$sessID);
    }

    /**
      +----------------------------------------------------------
     * Session 垃圾回收
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $sessMaxLifeTime 
      +----------------------------------------------------------
     */
    public function gc($sessMaxLifeTime) {
        return true;
    }

    /**
      +----------------------------------------------------------
     * 打开Session 
      +----------------------------------------------------------
     * @access public 
      +----------------------------------------------------------
     * @param string $savePath 
     * @param mixed $sessName  
      +----------------------------------------------------------
     */
    public function execute() {
        session_set_save_handler(
                array(&$this, "open"),
                array(&$this, "close"),
                array(&$this, "read"),
                array(&$this, "write"),
                array(&$this, "destroy"),
                array(&$this, "gc")
        );
    }

    public function __destruct() {
        if ($this->options['persistent'] == 'pconnect') {
            $this->handler->close();
        }
        session_write_close();
    }

}

2、TP配置文件：config.php

 
return array(
//'配置项'=>'配置值'
//Redis Session配置
'SESSION_AUTO_START'=>  true,// 是否自动开启Session
'SESSION_TYPE'=>  'Redis',//session类型
'SESSION_PERSISTENT'    =>  1,//是否长连接(对于php来说0和1都一样)
'SESSION_CACHE_TIME'=>  1,//连接超时时间(秒)
'SESSION_EXPIRE'=>  0,//session有效期(单位:秒) 0表示永久缓存
'SESSION_PREFIX'=>  'sess_',//session前缀
'SESSION_REDIS_HOST'=>  '127.0.0.1,192.168.1.225', //分布式Redis,默认第一个为主服务器
'SESSION_REDIS_PORT'=>  '6379',       //端口,如果相同只填一个,用英文逗号分隔
'SESSION_REDIS_AUTH'    =>  '123456789',    //Redis auth认证(密钥中不能有逗号),如果相同只填一个,用英文逗号分隔 );

四、测试：
1、在WWW服务器中TP3.2.3中建个控制器：IndexController.class.php

namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    public function index(){
        session('names','123456');  //设置session
        dump(session());
        echo "这里是前台！";
    }
}

2、执行完之后，看看master和slave服务器里有没有数据:
打开redis客户端，/home/redis-3.0.7/src/redis-cli

[root@localhost ~]# /home/redis-3.0.7/src/redis-cli
127.0.0.1:6379> auth 123456789
OK
127.0.0.1:6379> keys *
1) "sess_5i797nkgenpbhjc2a0tf7mqod6"
127.0.0.1:6379>
127.0.0.1:6379>
127.0.0.1:6379> get "sess_5i797nkgenpbhjc2a0tf7mqod6"
"sess_|a:1:{s:5:\"names\";s:16:\"123456\";}"
127.0.0.1:6379>

注意事项：
1、临时关闭linux防火墙：service iptables stop
2、临时关闭selinux：setenforce 0
否则会出现数据同步不过来的情况，
正式生产环境需要配置iptables策略。