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Implement PHP login function and jump

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Release： 2024-03-13 11:02:01

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Implement PHP login function and jump

In web development, the login function is one of the most common and important functions. Implementing the login function and jump through PHP can protect the security of website information and ensure the authenticity of user identities. This article will briefly introduce how to use PHP to implement a simple login function and implement page jump after successful login.

First, we need to create two files: an HTML file for the login page, and a PHP file to handle the login logic.

Create the login.html file (login page):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<body>
<h2>登录</h2>
<form action="login.php" method="post">
    用户名：<input type="text" name="username" required><br><br>
    密码：<input type="password" name="password" required><br><br>
    <input type="submit" value="登录">
</form>
</body>
</html>

Copy after login

In the login page, we provide input boxes for username and password, and set a submit button . The submission target of the form is the login.php file, and the username and password are passed through the POST method.

Create the login.php file (processing login logic):

<?php
// 获取用户输入的用户名和密码
$username = $_POST['username'];
$password = $_POST['password'];

// 简单的用户名和密码验证（这里仅为示例，请根据实际情况进行安全验证）
if ($username === 'admin' && $password === '123456') {
    // 验证通过，设置Session并跳转到欢迎页面
    session_start();
    $_SESSION['username'] = $username;
    header('Location: welcome.php');
} else {
    // 验证失败，返回登录页面
    header('Location: login.html');
}
?>

Copy after login

In the login.php file, first obtain the username and password entered by the user. Then perform simple username and password verification. This is only an example. In actual projects, more stringent verification methods should be used. If the verification passes, we use the session_start() function to open the session, store the user name in the session, and then use the header function to jump to welcome.php on the page.

Create the welcome.php file (the welcome page after successful login):

<?php
session_start();
if(isset($_SESSION['username'])) {
    $username = $_SESSION['username'];
    echo "欢迎回来，$username!";
} else {
    header('Location: login.html');
}
?>

Copy after login

In the welcome.php file, we first open the session through the session_start() function, Then determine whether the user name information is stored in the session. If it exists, a message welcoming the user will be output; if it does not exist, it will jump back to the login page.

Through the above steps, we have implemented a simple PHP login function and implemented page jump after successful login. When the user enters the correct username and password on the login page, it will jump to the welcome page, otherwise it will return to the login page. This simple example can help you understand how to use PHP to implement the login function and page jump. Hope this helps!

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