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How to write a simple user registration function using PHP

王林

Release： 2023-07-05 09:26:02

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How to use PHP to write a simple user registration function

In modern Internet applications, the user registration function is one of the most basic and common functions. Whether it is an e-commerce website, social media platform or various applications, users are required to register for easy use and management. This article will introduce how to use PHP to write a simple user registration function, and attach a code example.

First, we need to create a database to store user registration information. In MySQL, you can create a table named "users" using the following SQL statement:

CREATE TABLE users (
  id INT(11) AUTO_INCREMENT PRIMARY KEY,
  username VARCHAR(50) NOT NULL,
  email VARCHAR(100) NOT NULL,
  password VARCHAR(255) NOT NULL
);

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In this table, we will store each user's unique ID, username, email, and password. In actual applications, other fields may be needed, such as user avatar, personal profile, etc.

Next, we need to create a registration page (register.php) for users to fill in registration information. On this page, users need to provide their username, email and password, and send this information to the backend for processing by submitting the form. The following is a sample code for a simple register.php page:

<!DOCTYPE html>
<html>
<head>
  <title>用户注册</title>
</head>
<body>
  <h2>用户注册</h2>
  <form action="register.php" method="POST">
    <label for="username">用户名:</label>
    <input type="text" id="username" name="username" required><br><br>
    
    <label for="email">邮箱:</label>
    <input type="email" id="email" name="email" required><br><br>
    
    <label for="password">密码:</label>
    <input type="password" id="password" name="password" required><br><br>
    
    <input type="submit" value="注册">
  </form>
</body>
</html>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $username = $_POST['username'];
  $email = $_POST['email'];
  $password = password_hash($_POST['password'], PASSWORD_DEFAULT);

  // 将注册信息插入数据库
  $conn = new mysqli('localhost', 'root', 'password', 'dbname');
  if ($conn->connect_error) {
    die("数据库连接失败: " . $conn->connect_error);
  }

  $sql = "INSERT INTO users (username, email, password) VALUES ('$username', '$email', '$password')";
  if ($conn->query($sql) === TRUE) {
    echo "注册成功";
  } else {
    echo "注册失败: " . $conn->error;
  }

  $conn->close();
}
?>

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In this PHP code, we first check whether the requested method is POST. If it is a POST request, it means that the user has filled in the registration information and clicked the submit button. We then get the username, email, and password from the $_POST array and hash the password using the password_hash() function for enhanced security.

Next, we use the mysqli library to establish a connection with the MySQL database and insert the registration information into the "users" table. Finally, the corresponding prompt information is output according to the operation result.

After we have the registration page and registration processing code, we also need a login page (login.php) for users to log in. The following is a sample code for a simple login.php page:

<!DOCTYPE html>
<html>
<head>
  <title>用户登录</title>
</head>
<body>
  <h2>用户登录</h2>
  <form action="login.php" method="POST">
    <label for="username">用户名:</label>
    <input type="text" id="username" name="username" required><br><br>
    
    <label for="password">密码:</label>
    <input type="password" id="password" name="password" required><br><br>
    
    <input type="submit" value="登录">
  </form>
</body>
</html>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $username = $_POST['username'];
  $password = $_POST['password'];

  // 查询数据库中是否存在对应的用户
  $conn = new mysqli('localhost', 'root', 'password', 'dbname');
  if ($conn->connect_error) {
    die("数据库连接失败: " . $conn->connect_error);
  }

  $sql = "SELECT * FROM users WHERE username='$username'";
  $result = $conn->query($sql);

  if ($result->num_rows > 0) {
    $user = $result->fetch_assoc();
    if (password_verify($password, $user['password'])) {
      echo "登录成功";
    } else {
      echo "密码错误";
    }
  } else {
    echo "用户不存在";
  }

  $conn->close();
}
?>

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In login.php, we handle the POST request similarly to the registration page. First, get the username and password entered by the user. Then, connect to the database and query whether the corresponding user exists. If it exists, verify whether the password is correct. If it is correct, a prompt that the login is successful will be output. Otherwise, a prompt that the password is incorrect will be output. If the username does not exist, a prompt indicating that the user does not exist is output.

The above is a simple example of user registration and login functions written in PHP. Through this example, we can clearly understand how to use PHP to write the basic process of user registration function, and master the relevant coding skills. Of course, in practical applications, there are many details to consider, such as front-end form validation, security processing, error handling, etc. These contents can be expanded and improved according to specific needs and actual conditions. I hope this article can help you understand and apply the PHP user registration function.

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