How to log out the session when the PHP browser closes the page

How to close the session in PHP browser: first use "session_start();" to open the session; then clear the session information; then clear the client sessionid; finally, use "session_destroy();" to completely destroy the session.

#1. Session_start() must be enabled on each page before session can be used in each page.

2. Session_start() initializes the session. The first visit will generate a unique session ID and save it on the client (saved based on cookies). The next time the user visits, session_start() will check whether there is a session. ID, if there is a browser, it will bring this session ID (passed by sending a header file, which can be seen with ff browser) to determine the client.

3. The session given to the cookie will save a session ID, session_id, on the client. This can be seen by printing the cookie. The key value of this session_id is session_name, session_id() == $_COOKIE[session_name( )]

4. If the client disables cookies, you must use the url to pass the session_id, which is the SESSION given to the URL.

5. You cannot use unset($_SESSION) when logging out of the SESSION. You can use $ _SESSION = array() or $_SESSION = null. The correct method to log out the session is as follows:

//正确的注销session方法：
//1开启session
session_start();
   
//2、清空session信息
$_SESSION = array();
   
//3、清楚客户端sessionid
if(isset($_COOKIE[session_name()]))
{
  setCookie(session_name(),'',time()-3600,'/');
}
//4、彻底销毁session
session_destroy();

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