Stripe\ApiRequestor::_encodeObjects PHP Метод

    private static function _encodeObjects($d)
    {
        if ($d instanceof ApiResource) {
            return Util\Util::utf8($d->id);
        } elseif ($d === true) {
            return 'true';
        } elseif ($d === false) {
            return 'false';
        } elseif (is_array($d)) {
            $res = array();
            foreach ($d as $k => $v) {
                $res[$k] = self::_encodeObjects($v);
            }
            return $res;
        } else {
            return Util\Util::utf8($d);
        }
    }