/**
* @param $captcha
* @return mixed
*/
public static function check($captcha)
{
$curl = curl_init();
$fields = array('secret' => self::SECRET, 'response' => $captcha, 'remoteip' => $_SERVER['REMOTE_ADDR']);
$fields_string = '';
foreach ($fields as $key => $value) {
$fields_string .= $key . '=' . $value . '&';
}
rtrim($fields_string, '&');
curl_setopt_array($curl, array(CURLOPT_RETURNTRANSFER => 1, CURLOPT_TIMEOUT => 600, CURLOPT_URL => 'https://www.google.com/recaptcha/api/siteverify', CURLOPT_POST => 1, CURLOPT_POSTFIELDS => $fields_string));
$resp = curl_exec($curl);
curl_close($curl);
$resp = Core_Tools::JsonDecode($resp);
return $resp['success'];
}