session.save_handler = redis

<?php 
class SessionManager{

 private $redis;
 private $sessionSavePath;
 private $sessionName;
 private $sessionExpireTime = 60;//redis，session的過期時間為30s

 public function __construct(){
 $this->redis = new Redis();//創(chuàng)建phpredis實例
 $this->redis->connect('127.0.0.1', 6379);//連接redis
 //$this->redis->auth("123456x");//授權
 $retval = session_set_save_handler(
 array($this,"open"),
 array($this,"close"),
 array($this,"read"),
 array($this,"write"),
 array($this,"destroy"),
 array($this,"gc")
 );
 session_start();
 }

 public function open($path,$name){
 return true;
 }

 public function close(){
 return true;
 }

 public function read($id){
 $value = $this->redis->get($id);//獲取redis中的指定記錄
 if($value){
 return $value;
 }else{
 return '';
 }
 }

 public function write($id,$data){
 if($this->redis->set($id,$data)){//以session ID為鍵，存儲
 $this->redis->expire($id,$this->sessionExpireTime);//設置redis中數(shù)據(jù)的過期時間，即session的過期時間
 return true;
 }

 return false;
 }

 public function destroy($id){
 if($this->redis->delete($id)){//刪除redis中的指定記錄
 return true;
 }
 return false;
 }

 public function gc($maxlifetime){
 return true;
 }

 public function __destruct(){
 session_write_close();
 }
}

<?php 
require_once 'SessionManager.php';
new SessionManager();
$_SESSION['username'] = 'helloweba';

<?php 
require_once 'SessionManager.php';
new SessionManager();
echo $_SESSION['username'];