public static function get_url($url, $postfields = "")
        {
            $curl = curl_init($url);
            curl_setopt($curl, CURLOPT_TIMEOUT, "50");
            curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30");
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
            curl_setopt($curl, CURLOPT_HEADER, 0);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, TRUE);
            curl_setopt($curl, CURLOPT_ENCODING, "UTF-8");
            if( !empty($postfields) ) {
                curl_setopt($curl, CURLOPT_POST, TRUE);
                curl_setopt($curl, CURLOPT_POSTFIELDS, $postfields);
            }

            $curlResult = curl_exec($curl);
            curl_close($curl);
            return str_replace(array("\n", "\t", "\r"), null, $curlResult);
        }

        public static function getSites() {

            $json_data = json_encode( tb::get_url(tb::$target_url."service/getSites", "domain=".self::siteURL()."&lisans=".self::getOption("lisans")), true);