php短信验证码程序

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

// 发送短信验证码（模拟）
function sendSms($phone, $code) {
    // 这里应该调用第三方短信服务API
    echo "Sending SMS to $phone: Your verification code is $code";
}

// 主程序
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $phone = $_POST['phone'];
    $code = generateCode();
    sendSms($phone, $code);
    // 将验证码保存到数据库或缓存中，以便后续验证
    // ...
} else {
    echo '<form method="post">
            Phone: <input type="text" name="phone">
            <input type="submit" value="Send Code">
          </form>';
}
?>