php邮箱注册验证

<?php
// 数据库连接
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 注册表单提交处理
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $email = $_POST['email'];
    $token = bin2hex(random_bytes(16)); // 生成随机验证令牌

    // 将邮箱和令牌存入数据库
    $sql = "INSERT INTO users (email, token, verified) VALUES ('$email', '$token', 0)";
    if ($conn->query($sql) === TRUE) {
        // 发送验证邮件
        $to = $email;
        $subject = "邮箱验证";
        $message = "请点击以下链接验证您的邮箱地址: http://example.com/verify.php?token=$token";
        $headers = "From: webmaster@example.com";

        mail($to, $subject, $message, $headers);
        echo "验证邮件已发送，请检查您的邮箱。";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

$conn->close();
?>