How to implement the logout function in php?

Method: First detect whether the variable exists through "if(isset($_SESSION["Variable"]))"; if it exists, use session_unset() and session_destroy() to release the session; finally use header( ) function jumps to the login interface.

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In the PHP program, after the login is completed, it will be stored in the session , when logging out, the session needs to be released. The corresponding code is as follows.

<?php
session_start();
if(isset($_SESSION["uid"]))  // 检测变量是否设置
{
    session_unset();  // 释放当前在内存中已经创建的所有$_SESSION变量，但是不删除session文件以及不释放对应的session id；
    session_destroy();  // 删除当前用户对应的session文件以及释放session id，内存中$_SESSION变量内容依然保留；
}
header("location:login.php"); // 重定向到登录界面
?>

It should be noted that:

• session_unset(); releases all $_SESSION variables currently created in the memory, but does not delete the session file and does not release the corresponding session id;

• session_destroy(); deletes the session file corresponding to the current user and releases the session id. The content of the $_SESSION variable in the memory is still retained;

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