PHP login script using session and session variables
P粉726133917
2023-08-21 19:01:51
<p>I've just finished a complete login and registration system in PHP, but my problem is that I haven't used any sessions yet. I'm new to PHP and have never used sessions before. What I want to do is that after the user registers and fills out the login form, he still stays on the same page. So one part of the page will be if the session is logged in and the other part will be otherwise (the user is not logged in so the login form is shown). Can someone tell me how to get started? </p>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
This is the simplest session code written in PHP. We used 3 files.
login.php
<?php session_start(); // 使用此函数启动会话 if(isset($_SESSION['use'])) // 检查会话是否已存在，如果存在则直接重定向到主页 { header("Location:home.php"); } if(isset($_POST['login'])) // 检查用户是否点击了登录按钮 { $user = $_POST['user']; $pass = $_POST['pass']; if($user == "Ank" && $pass == "1234") // 用户名默认为“Ank”，密码默认为1234 { $_SESSION['use']=$user; echo '<script type="text/javascript"> window.open("home.php","_self");</script>'; // 登录成功后重定向到home.php } else { echo "无效的用户名或密码"; } } ?> <html> <head> <title> 登录页面 </title> </head> <body> <form action="" method="post"> <table width="200" border="0"> <tr> <td> 用户名</td> <td> <input type="text" name="user" > </td> </tr> <tr> <td> 密码 </td> <td><input type="password" name="pass"></td> </tr> <tr> <td> <input type="submit" name="login" value="登录"></td> <td></td> </tr> </table> </form> </body> </html>home.php
<?php session_start(); ?> <html> <head> <title> 主页 </title> </head> <body> <?php if(!isset($_SESSION['use'])) // 如果会话未设置，则重定向到登录页面 { header("Location:Login.php"); } echo $_SESSION['use']; echo "登录成功"; echo "<a href='logout.php'> 退出</a> "; ?> </body> </html>logout.php
<?php session_start(); echo "成功退出"; session_destroy(); // 销毁会话 header("Location: Login.php"); ?>To start a session, you need to say this at the top of the page or before calling the session code
Put user ID into session to track who is logged in
Check if anyone is logged in
if (isset($_SESSION['user'])) { // 已登录 } else { // 未登录 }Find the ID of the logged in user
On your page
<?php session_start(); if (isset($_SESSION['user'])) { ?> 已登录的HTML和代码在这里 <?php } else { ?> 未登录的HTML和代码在这里 <?php }