<?php
   ini_set("session.save_handler", "redis");
   ini_set("session.save_path", "tcp://127.0.0.1:6379");
   session_start();
   $redis = new Redis();  
   $redis->connect(‘127.0.0.1‘, 6379);  
   //$redis->auth(‘passwd‘);redis认证  
   echo $redis->get(‘PHPREDIS_SESSION:‘.session_id());