谷歌重新收回缺失的输入回应

Question

我对Google recaptcha的回复有误。 拜托，你能帮我找一下我的错误吗？

function captcha(){
    $secret = "...";
    $response = $_POST['g-recaptcha-response'];
    $remoteip = $_SERVER['REMOTE_ADDR'];
    $api_url = "https://www.google.com/recaptcha/api/siteverify?secret=".$secret."&response=".$response."&remoteip=".$remoteip;
    $decode = json_decode(file_get_contents($api_url), true);
    if ($decode['success'] == true) {
        return $decode['success'];
    }else{
        $errorsCode = "";
        foreach ($decode['error-codes'] as $key => $value) {
            $errorsCode .= '<p><strong>' . $key.':</strong> '.$value.'</p>';
        }
        return $errorsCode;
    }
}

我总是得到同样的错误：missing-input-response。

感谢您的帮助！

编辑：由 Mrpink

解决https://gist.github.com/jonathanstark/dfb30bdfb522318fc819