PHPDaemon\SockJS\Methods\Jsonp::sendFrame PHP Method

    protected function sendFrame($frame)
    {
        $c =& $this->attrs->get['c'];
        if (!is_string($c)) {
            $this->header('400 Bad Request');
            $this->finish();
            return;
        }
        $this->outputFrame($c . '(' . json_encode($frame, JSON_UNESCAPED_SLASHES) . ");\r\n");
        parent::sendFrame($frame);
    }