How to restore session content through session_id in php

This article mainly talks about restoring session content through session_id, which has certain reference value. Interested friends can learn about it.

1. Obtain session_id

// 开启session
session_start();
// 取得
$_SESSION['test'] = '111222333';
$session_id = session_id();
echo $session_id;exit;     // fu1dmdnrk0o2pi612b8jh9kts1

2. Obtain session through session_id

// 根据session_id查询session信息
session_id('fu1dmdnrk0o2pi612b8jh9kts1');
session_start();
print_r($_SESSION);exit;     // Array ( [test] => 111222333 )

One issue that needs attention here is: When obtaining session_id, you need to first session_start(); When obtaining the session through session_id, session_start() is required. Because session_start() will check whether there is currently an active session, if not, create a session and access it through the $_SESSION array. If the session already exists, the session_start() function will load the registered session variables so that they can be used.

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