PHP uses redis to realize session instance sharing

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Release: 2023-03-18 12:02:01
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Redis has been widely used due to its efficient performance. Traditional sessions store data in files. Due to the low IO performance of disks, session performance encounters a bottleneck. This article mainly introduces how to store sessions in redis to improve program efficiency.

Method one:

Find the configuration file php.ini, modify it to the following content, save and restart the service

session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"
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Method two:

Directly in the code Add the following content:

ini_set("session.save_handler", "redis");
ini_set("session.save_path", "tcp://127.0.0.1:6379");
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Note: If the connection password requirepass is set in the configuration file redis.conf, save_path needs to be written like this tcp://127.0.0.1:6379?auth=authpwd, otherwise when saving the session An error will be reported.


Test:

<?php
//ini_set("session.save_handler", "redis");
//ini_set("session.save_path", "tcp://127.0.0.1:6379");
session_start();
//存入session
$_SESSION[&#39;class&#39;] = array(&#39;name&#39; => &#39;toefl&#39;, &#39;num&#39; => 8);
//连接redis
$redis = new redis();
$redis->connect(&#39;127.0.0.1&#39;, 6379);
//检查session_id
echo &#39;session_id:&#39; . session_id() . &#39;<br/>&#39;;
//redis存入的session(redis用session_id作为key,以string的形式存储)
echo &#39;redis_session:&#39; . $redis->get(&#39;PHPREDIS_SESSION:&#39; . session_id()) . &#39;<br/>&#39;;
//php获取session值
echo &#39;php_session:&#39; . json_encode($_SESSION[&#39;class&#39;]);
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Related recommendations:

PHP’s SESSION mechanism analysis

Cookie/Session mechanism introduction

Redis cluster building graphic tutorial

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