Session operations after user login (setting of expiration time)

Users enter their username and password to log in. If it is empty, the database is not found or the password is wrong, return and log in again.

After successful login, it will be displayed:

Set the session expiration time and jump to:

If the user is already logged in, jump to:

The code is as follows:

success.php

alert('用户名不能为空！');location.href='login.html';"; }else { $username=trim($_POST['username']); } if (empty($_POST['password'])){ echo ""; }else{ $password=$_POST['password']; } } $mysqli = new mysqli('localhost', 'root', 'root', 'student'); $result = $mysqli->query("SELECT password FROM user WHERE username = "."'$username'"); $rs=$result->fetch_row(); if (!empty($rs)){ if ($password != $rs[0]) { echo ""; }else{ $expire=3600; ini_set('session.gc_maxlifetime', $expire);//保存1小时 if (empty($_COOKIE['PHPSESSID'])) { session_set_cookie_params($expire); session_start(); }else{ session_start(); setcookie('PHPSESSID', session_id(), time() + $expire); } if(isset($_SESSION['username'])){ exit("您已经登入了，请不要重新登入！用户名：{$_SESSION['username']}---注销"); }else{ $_SESSION['username']=$_POST['username']; } echo "
"; echo "您好！{$_SESSION['username']},欢迎回来！"; echo "注销"; } }else{ echo ""; }