php邮箱验证码

<?php
// 生成随机验证码
function generateCode($length = 6) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $code = '';
    for ($i = 0; $i < $length; $i++) {
        $code .= $characters[rand(0, strlen($characters) - 1)];
    }
    return $code;
}

// 发送邮件
function sendEmail($to, $subject, $message) {
    $headers = "From: your_email@example.com\r\n";
    $headers .= "Reply-To: your_email@example.com\r\n";
    $headers .= "MIME-Version: 1.0\r\n";
    $headers .= "Content-Type: text/html; charset=UTF-8\r\n";

    mail($to, $subject, $message, $headers);
}

// 生成并发送验证码
$code = generateCode();
$to = 'user@example.com';
$subject = '邮箱验证码';
$message = "您的验证码是：$code，请在5分钟内使用。";
sendEmail($to, $subject, $message);

// 验证验证码
if (isset($_POST['code']) && $_POST['code'] == $code) {
    echo "验证成功！";
} else {
    echo "验证失败！";
}
?>