【原】thinkphp实现存储session至redis

ThinkphpLibraryThinkSessionDriver中新建redis缓存文件：Redis.class.php
ThinkphpCommonfunction.php 中 function session($name='',$value='')   //session说明文件


一：配置文件中新加：
//redis操作session
'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'    =>  3000,        //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'        =>  'sses_',        //session前缀

二：Redis.class.php中内容：
<?php

namespace ThinkSessionDriver;

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

    /**
     * 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('REDIS_HOST') ? C('REDIS_HOST') : '127.0.0.1',
                'port'          => C('REDIS_PORT') ? C('REDIS_PORT') : 6379,
                'timeout'       => C('SESSION_CACHE_TIME') ? C('SESSION_CACHE_TIME') : false,
                'persistent'    => C('SESSION_PERSISTENT') ? C('SESSION_PERSISTENT') : false,
                'auth'          => C('REDIS_AUTH') ? C('REDIS_AUTH') : false,
                'dbindex'       => C('REDIS_DBINDEX') ? C('REDIS_DBINDEX') : 0, //选择存库
            );
        }
        $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');
        $this->options['dbindex'] = isset($options['dbindex'])? $options['dbindex']  :   0;  //选择存库

        $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 ThinkException('Redis Error', 100);
            } else {
                $result = $this->handler->$func($this->options['host'][$i], $this->options['port'][$i], $this->options['timeout']);
                if (!$result)
                    throw new ThinkException('Redis Error', 101);
            }
            if ($this->options['auth'][$i]) {
                $result = $this->handler->auth($this->options['auth'][$i]);
                if (!$result) {
                    throw new ThinkException('Redis Error', 102);
                }
            }
            //选择db存库
            if (0 != $this->options['dbindex']) {
                $this->handler->select($this->options['dbindex']);
            }

        } catch ( Exception $e ) {
            exit('Error Message:'.$e->getMessage().'<br>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();
    }

}