Detailed explanation of the steps to set up web cluster session synchronization in PHP

This time I will bring you a detailed explanation of the steps for setting up web cluster session synchronization in PHP. What are the precautions for setting up web cluster session synchronization in PHP? The following is a practical case, let’s take a look. one time.

PHP's session defaults to file storage:

session.save_handler = files
session.save_path = "/var/lib/php/session"

As a web cluster, when session synchronization is required, it is a good way to store the session in distributed memcache to achieve shared synchronization

Method:

Type 1:

vi /etc/php.ini

session.save_handler = memcache
session.save_path = "tcp://192.168.20.193:11211,tcp://192.168.20.194:11211"

Type 2:

Use the ini_set function in the php file for configuration, suitable for virtual hosts that cannot modify the configuration file

<?php
....
ini_set("session.save_handler", "memcache");
ini_set("session.save_path", "tcp://192.168.20.193:11211,tcp://192.168.20.194:11211");
....
?>

restart the web server

service httpd restart

View phpinfo

Test

login.php in 192.168.20.193

<?php
session_start();
$_SESSION[&#39;login_time&#39;] = time();
$_SESSION[&#39;username&#39;] = &#39;test2&#39;;
$token=session_id();
echo $token;
//memache实现
$mem = new Memcache();
$mem->addServer(&#39;192.168.20.193&#39;,11211);
$mem->addServer(&#39;192.168.20.194&#39;,11211);
/*
//memached实现
$mem = new Memcached();
$servers = array(
 array(&#39;192.168.20.193&#39;, 11211, 33),
 array(&#39;192.168.20.194&#39;, 11211, 67)
);
$mem->addServers($servers);
*/
echo &#39;<hr>&#39;;
print_r($mem->get($token));
?>
<p>
<a href="http://192.168.20.194/user.php?token=<?php echo $token;?>" rel="external nofollow" target="_balnk">跳转到194网站的个人中心</a>
</p>

user.php## in 192.168.20.194 #

<?php
$mem = new Memcache();
$mem->addServer(&#39;192.168.20.193&#39;,11211);
$mem->addServer(&#39;192.168.20.194&#39;,11211);
$token=$_GET[&#39;token&#39;];//获取传过来的token
print_r($mem->get($token));
?>
<p>
<a href="http://192.168.20.193/user.php?token=<?php echo $token;?>" rel="external nofollow" target="_balnk">返回193网站的个人中心</a>
</p>

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