當然要寫先安裝php的擴展，可參考這篇文章：Redis及PHP擴展安裝
修改php.ini的設置

復制代碼 代碼如下:

session.save_handler = redis
session.save_path = “tcp://127.0.0.1:6379″
修改后重啟php-fpm或nginx，phpinfo()

session redis
如果不想修改php.ini可這樣

復制代碼 代碼如下:

ini_set(“session.save_handler”,”redis”);
ini_set(“session.save_path”,”tcp://127.0.0.1:6379″);

復制代碼 代碼如下:

<?php
//如果未修改php.ini下面兩行注釋去掉
//ini_set('session.save_handler', 'redis');
//ini_set('session.save_path', 'tcp://127.0.0.1:6379');
session_start();
$_SESSION['sessionid'] = 'this is session content!';
echo $_SESSION['sessionid'];
echo '<br/>';

$redis = new redis();
$redis->connect('127.0.0.1', 6379);
//redis用session_id作為key并且是以string的形式存儲
echo $redis->get('PHPREDIS_SESSION:' . session_id());
 ?>