How to use PHP to implement the function of logging in and submitting the jump page

PHP is a widely used open source scripting language used for web development. Among them, the login function is one of the functions we often use in web development. This article will introduce how to use PHP to implement the function of logging in and submitting a jump page, so that everyone can use PHP more flexibly.

1. Create login page

First, we need to create a login page for the website, where users can enter their username and password. Generally, we can create a login form in HTML and submit the values ​​in the form to the background using the post method. For example:

  用户名：      
  密码：      
  登录

In this form, we define two input boxes, namely username and password. When the user clicks the login button, the form is submitted to the processing page named "login.php" through the post method.

2. Processing login requests

When the user clicks the login button, we need to process the data submitted by the user. In other words, we need to receive and verify the user's login information in the login.php file. After the verification is passed, the user will be redirected to the success page; otherwise, the user will be prompted to enter incorrect information. The following is the processing logic of the login.php file:

<?php   // 接收表单提交的数据
  $username = $_POST[&#39;username&#39;];
  $password = $_POST[&#39;password&#39;];

  // 与数据库中的信息进行比对，这里以简单的数组为例
  $users = [
    [&#39;username&#39; => 'admin', 'password' => '123456'],
    ['username' => 'test', 'password' => '654321'],
  ];

  $login_success = false;

  foreach ($users as $user) {
    if ($user['username'] == $username && $user['password'] == $password) {
      $login_success = true;
      break;
    }
  }

  // 登录成功则跳转到success.php页面，否则跳转到error.php页面
  if ($login_success) {
    header('Location: success.php');
    exit();
  } else {
    header('Location: error.php');
    exit();
  }
?>

In this file, we first receive the data submitted by the form and compare the data with the username and password previously stored in the program. If the username and password match, the $login_success variable is set to true; otherwise, it is set to false.

After the comparison is completed, we need to jump the user to different pages based on the login results. We implement the jump through the header function in PHP. For example, in this example, when the login is successful, the user will be redirected to the success.php page. The error.php page will be responsible for outputting login error information to the user.

3. Create success and failure pages

When the user logs in successfully or fails, we need to display some meaningful information to the user. This information needs to be set in our page, and different pages will be displayed accordingly based on the user's login results. We can set it in success.php and error.php. For example, in success.php, we can output the message "Login successful":

nbsp;html>

  
    <meta>
    <title>登录成功</title>
  
  
    <h1 id="登录成功">登录成功</h1>
    <p>欢迎您回来！</p>
  

In error.php, we can output the message "Login failed":

nbsp;html>

  
    <meta>
    <title>登录失败</title>
  
  
    <h1 id="登录失败">登录失败</h1>
    <p>用户名或密码错误，请重新输入。</p>
  

Need to pay attention The thing is, although we used the header function to jump to the page earlier, if some content has been output before the jump, the jump operation will not take effect. Therefore, we need to make sure nothing is output before jumping.

To sum up, this article introduces how to use PHP to implement the function of logging in and submitting the jump page. We first created a login page and then submitted the form data to a processing page called "login.php". On this page, we verify the user's login information and jump to different pages based on the verification results. Finally, we created success and failure pages to show the user the login results. Through this example, I believe you have understood how to use PHP to implement the login function in web development, and have mastered some basic form submission and page jump methods.

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