/**
* Calls an HTTP POST function to verify if the user's guess was correct
* @param string $privkey
* @param string $remoteip
* @param string $challenge
* @param string $response
* @param array $extra_params an array of extra variables to post to the server
* @return ReCaptchaResponse
*/
public static function recaptcha_check_answer($privkey, $remoteip, $challenge, $response, $extra_params = array())
{
if ($privkey == null || $privkey == '') {
die("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
}
if ($remoteip == null || $remoteip == '') {
die("For security reasons, you must pass the remote ip to reCAPTCHA");
}
//discard spam submissions
if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
$recaptcha_response = new ReCaptchaResponse();
$recaptcha_response->is_valid = false;
$recaptcha_response->error = 'incorrect-captcha-sol';
return $recaptcha_response;
}
$response = CRecaptchaHelper::_recaptcha_http_post(RECAPTCHA_VERIFY_SERVER, "/verify", array('privatekey' => $privkey, 'remoteip' => $remoteip, 'challenge' => $challenge, 'response' => $response) + $extra_params);
$answers = explode("\n", $response[1]);
$recaptcha_response = new ReCaptchaResponse();
if (trim($answers[0]) == 'true') {
$recaptcha_response->is_valid = true;
} else {
$recaptcha_response->is_valid = false;
$recaptcha_response->error = $answers[1];
}
return $recaptcha_response;
}
