php login verification jump page
In web development, login verification is a common function. After the user enters their username and password on the login page, the server needs to verify whether the information is correct. If the information entered is correct, the server will allow the user to access pages that require a login. Otherwise, the server will deny the user access, or jump to the login page to re-enter the user name and password. In PHP, it is relatively simple to implement login verification and jump to a specified page. You only need to use some PHP related functions and techniques to achieve it. This article will introduce how to use PHP to implement login verification and jump to the specified page.
- Build a login page and a verification page
First, we need to create a login page and a verification page. The login page requires a form where the user needs to enter their username and password. The verification page requires a PHP script to verify whether the information entered by the user is correct. In this example, we simplify the process first. The username and password are written in the PHP script, and then extended to the database.
The following is a simple login page example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录页面</title>
</head>
<body>
<h1>登录</h1>
<form method="post" action="login.php">
<label for="username">用户名：</label><input type="text" name="username"><br/>
<label for="password">密码：</label><input type="password" name="password"><br/>
<input type="submit" value="登录">
</form>
</body>
</html>In this page, we set up a form to let the user enter their username and password. The action attribute of the form is set to "login.php", which means that the form data is submitted to the PHP script named login.php through POST.
The following is an example of a simple verification page:
<?php
session_start(); // 启动会话
// 确定正确的用户名和密码
$valid_username = 'user';
$valid_password = 'password';
// 获取用户输入的用户名和密码
$username = isset($_POST['username']) ? $_POST['username'] : '';
$password = isset($_POST['password']) ? $_POST['password'] : '';
// 验证用户名和密码
if ($username === $valid_username && $password === $valid_password) {
$_SESSION['username'] = $username; // 记录登录状态
header('Location: main.php'); // 跳转到主页面
} else {
echo '用户名或密码错误。';
}
?>In this page, we first start a PHP session to record the user's status during the login process. Next, we define a correct username and password. This is simply written in the code. In actual applications, it needs to be queried from the database. We then take the username and password entered by the user and compare it to the correct username and password. If the username and password match, use the $_SESSION array to record the username (for later page verification) and jump to the page named main.php. Otherwise, output an error message and stay on the current page.
- Determine whether the user is logged in
During the login process, we record the user's username information. In pages that require login status verification, we can use this information to determine whether the user is logged in. If the user is already logged in, the content of the page can be displayed directly; otherwise, the user needs to jump to the login page and log in again.
The following is a simple example:
<?php
session_start(); // 启动会话
if (!isset($_SESSION['username'])) {
header('Location: login.php'); // 跳转到登录页面
die(); //结束执行当前命令
}
echo '欢迎你，' . $_SESSION['username'] . '。';
?>In this page, we first start the session. Then, we use the isset function to determine whether the $_SESSION array contains user name information. If it is not included, use the header function to jump to the login page. If included, the required page content can be displayed.
- Complete example
The following is a complete example, including login page, verification page and main page:
Login page (login.php) :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录页面</title>
</head>
<body>
<h1>登录</h1>
<form method="post" action="login.php">
<label for="username">用户名：</label><input type="text" name="username"><br/>
<label for="password">密码：</label><input type="password" name="password"><br/>
<input type="submit" value="登录">
</form>
</body>
</html>
Authentication Page (main.php) :
<?php
session_start(); // 启动会话
if (!isset($_SESSION['username'])) {
header('Location: login.php'); // 跳转到登录页面
die(); //结束执行当前命令
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>主页面</title>
</head>
<body>
<h1>欢迎你，<?php echo $_SESSION['username']; ?>。</h1>
<p>这里是主页面。</p>
</body>
</html>
In this example, we first started the session in each page. When the user successfully logs in (that is, enters the correct username and password in the login.php page) the username information will be recorded in the session array $_SESSION. In the main page, we check whether the session array $_SESSION contains the username. If it is not included, use the header function to jump to the login page (login.php) and log in again.
When the user enters the correct login information, the login page (login.php) will immediately jump to the main page (main.php) and display the welcome message. If the user is not logged in or has an invalid login, it will immediately jump to the login page (login.php) to log in again.
Summary
It is very easy to implement login verification jump page in PHP. First, you need to create a login page and verification page. Then the verification page needs some basic PHP code to verify whether the information entered by the user is correct. If it is correct, the user status will be recorded in $_SESSION and jump to the specified page. In the page that needs to verify the login status, just use the record information in $_SESSION. In this way, you can ensure that all pages that require login verification are only accessed by logged-in users, ensuring the security and functionality of the website.
The above is the detailed content of php login verification jump page. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to Implement message queues (RabbitMQ, Redis) in PHP?
Mar 10, 2025 pm 06:15 PM
This article details implementing message queues in PHP using RabbitMQ and Redis. It compares their architectures (AMQP vs. in-memory), features, and reliability mechanisms (confirmations, transactions, persistence). Best practices for design, error
What Are the Latest PHP Coding Standards and Best Practices?
Mar 10, 2025 pm 06:16 PM
This article examines current PHP coding standards and best practices, focusing on PSR recommendations (PSR-1, PSR-2, PSR-4, PSR-12). It emphasizes improving code readability and maintainability through consistent styling, meaningful naming, and eff
How Do I Work with PHP Extensions and PECL?
Mar 10, 2025 pm 06:12 PM
This article details installing and troubleshooting PHP extensions, focusing on PECL. It covers installation steps (finding, downloading/compiling, enabling, restarting the server), troubleshooting techniques (checking logs, verifying installation,
How to Use Reflection to Analyze and Manipulate PHP Code?
Mar 10, 2025 pm 06:12 PM
This article explains PHP's Reflection API, enabling runtime inspection and manipulation of classes, methods, and properties. It details common use cases (documentation generation, ORMs, dependency injection) and cautions against performance overhea
PHP 8 JIT (Just-In-Time) Compilation: How it improves performance.
Mar 25, 2025 am 10:37 AM
PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.
How Do I Stay Up-to-Date with the PHP Ecosystem and Community?
Mar 10, 2025 pm 06:16 PM
This article explores strategies for staying current in the PHP ecosystem. It emphasizes utilizing official channels, community forums, conferences, and open-source contributions. The author highlights best resources for learning new features and a
How to Use Asynchronous Tasks in PHP for Non-Blocking Operations?
Mar 10, 2025 pm 04:21 PM
This article explores asynchronous task execution in PHP to enhance web application responsiveness. It details methods like message queues, asynchronous frameworks (ReactPHP, Swoole), and background processes, emphasizing best practices for efficien
How to Use Memory Optimization Techniques in PHP?
Mar 10, 2025 pm 04:23 PM
This article addresses PHP memory optimization. It details techniques like using appropriate data structures, avoiding unnecessary object creation, and employing efficient algorithms. Common memory leak sources (e.g., unclosed connections, global v
