/**
* Calls an HTTP POST function to verify if the user's guess was correct
*
* @param string $privateKey
* @param string $remoteip
* @param string $challenge
* @param string $response
* @param array $extra_params An array of extra variables to post to the server
* @return boolean $this->is_valid property
*/
public static function check($privateKey, $remoteIP, $challenge, $response, $extra_params = array())
{
$privateKey = $privateKey or die(self::RECAPTCHA_ERROR_KEY);
$remoteIP = $remoteIP or die(self::RECAPTCHA_ERROR_REMOTE_IP);
// Discard spam submissions
if (!$challenge or !$response) {
return self::$is_valid;
}
$response = self::httpPost(self::RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify", array('privatekey' => $privateKey, 'remoteip' => $remoteIP, 'challenge' => $challenge, 'response' => $response) + $extra_params);
$answers = explode("\n", $response[1]);
if (trim($answers[0]) == 'true') {
self::$is_valid = true;
} else {
self::$error = $answers[1];
}
return self::$is_valid;
}
