Come fare ad usare il reCaptcha senza uso delle librerie???

[Donovant]

La guida dice:

"This page explains how to verify a user's answer for a reCAPTCHA challenge without using a plugin. We offer a variety of plugins for different applications and programming environments, such as PHP and ASP.NET, and we encourage you to look at our multiple plugins before proceeding with the "Do-It-Yourself" (DIY) installation instructions below."

E poi

After your page is successfully displaying reCAPTCHA, you need to configure your form to check whether the answers entered by the users are correct. This is achieved by doing a POST request to http://www.google.com/recaptcha/api/verify. Below are the relevant parameters.

API Request

URL: http://www.google.com/recaptcha/api/verify

Parameters (sent via POST)
privatekey (required) Your private key
remoteip (required) The IP address of the user who solved the CAPTCHA.
challenge (required) The value of "recaptcha_challenge_field" sent via the form
response (required) The value of "recaptcha_response_field" sent via the form

Grazie

 

[Donovant]

Mi hanno consigliato di usare cURL (api PHP) per ottenere le info dal link, dato dalla guida di google, richiesto.
Ma ancora non ho capito come usarle:

$ch = curl_init("http://www.google.com/recaptcha/api/verify");


curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HEADER, 0);

$response = curl_exec($ch);
$info = curl_getinfo($ch, CURLINFO_HTTP_CODE);

curl_close($ch);
echo $response."<br/>";
echo $info."<br/>";

In locale, la pagina in questione carica all'infinito
Online invece esce fuori il logo di Google con il seguente testo:
Error 400. That’s an error.
Your client has issued a malformed or illegal request. That’s all we know. 1