How to use email verification in PHP to prevent users from registering with false identities?

How to use email verification in PHP to prevent users from registering with false identities?

With the rapid development of the Internet, false identity registration has become a common problem. To solve this problem, developers can use email verification to ensure the user's true identity. In this article, we will introduce how to implement email verification in PHP.

1. Create database table
   First, we need to create a database table to store user information. In this table, we need to include fields such as the user's unique identifier, username, password, and email address. The following is an example SQL statement to create this table:

CREATE TABLE users (
  id INT(11) PRIMARY KEY AUTO_INCREMENT,
  username VARCHAR(50) NOT NULL,
  password VARCHAR(255) NOT NULL,
  email VARCHAR(50) NOT NULL,
  is_verified TINYINT(1) DEFAULT 0
);

2. Registration page
   On the registration page, we need to provide a form for the user to enter their username, password and email address. and includes a button for submitting registration information. The following is a simple example form:

<form method="post" action="register.php">
  <input type="text" name="username" placeholder="用户名" required>
  <input type="password" name="password" placeholder="密码" required>
  <input type="email" name="email" placeholder="邮箱地址" required>
  <button type="submit">注册</button>
</form>

3. Registration Processing
   In the register.php file, we need to process the registration information submitted by the user. Before processing, we need to connect to the database and perform form validation.

<?php
// 连接到数据库
$conn = mysqli_connect("localhost", "username", "password", "dbname");

// 检查连接是否成功
if (!$conn) {
  die("数据库连接失败：" . mysqli_connect_error());
}

// 处理注册表单
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  // 获取用户提交的注册信息
  $username = $_POST["username"];
  $password = $_POST["password"];
  $email = $_POST["email"];

  // 检查邮箱是否已经被注册
  $emailQuery = "SELECT * FROM users WHERE email = '$email'";
  $result = mysqli_query($conn, $emailQuery);

  if (mysqli_num_rows($result) > 0) {
    echo "该邮箱已被注册，请使用其他邮箱。";
  } else {
    // 生成一个随机的验证码
    $verificationCode = mt_rand(100000, 999999);

    // 将用户信息插入数据库，并设置未验证状态
    $insertQuery = "INSERT INTO users (username, password, email, is_verified) VALUES ('$username', '$password', '$email', 0)";
    mysqli_query($conn, $insertQuery);

    // 发送验证邮件
    $subject = "邮箱验证";
    $message = "您的验证码是：" . $verificationCode;
    $headers = "From: your_email@example.com";

    mail($email, $subject, $message, $headers);

    echo "请查看您的邮箱并输入验证码来完成注册。";
  }
}

// 关闭数据库连接
mysqli_close($conn);
?>

4. Email Verification
   When the user successfully registers, the system will automatically send an email containing a verification code to the user. Users need to check their email and enter a verification code to complete verification.

<?php
// ...
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $verificationCode = $_POST["verificationCode"];

  // 检查验证码是否正确
  $verificationQuery = "SELECT * FROM users WHERE email = '$email' AND is_verified = 0";
  $result = mysqli_query($conn, $verificationQuery);

  if (mysqli_num_rows($result) > 0) {
    $user = mysqli_fetch_assoc($result);
    if ($verificationCode == $user["verification_code"]) {
      // 更新用户状态为已验证
      $updateQuery = "UPDATE users SET is_verified = 1 WHERE email = '$email'";
      mysqli_query($conn, $updateQuery);

      echo "邮箱验证成功！";
    } else {
      echo "验证码不正确，请重新输入。";
    }
  } else {
    echo "该邮箱已经通过验证。";
  }
}
// ...
?>

Through the above steps, we can use email verification to prevent users from using false identities to register. This method not only ensures the true identity of the user, but also avoids repeated registration by the user. With simple PHP code and basic database operations, we can easily implement this function. However, it should be noted that the email sending function requires the server to support the SMTP protocol and be configured correctly.

I hope this article will help you use email verification in PHP to prevent users from registering with false identities!

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