Logout and clearing of SESSION in PHP, phpsession logout_PHP tutorial

Logout and clearing of SESSION in PHP, phpsession logout

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 Some browsers 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, the session_id must be passed in the URL, which is the SESSION given to the URL

5. You cannot use unset($_SESSION) when logging out of a SESSION. You can use $_SESSION = array() or $_SESSION = null. The correct way to log out a 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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