raklib\server\ServerHandler::sendOption PHP Method

    public function sendOption($name, $value)
    {
        $buffer = chr(RakLib::PACKET_SET_OPTION) . chr(strlen($name)) . $name . $value;
        $this->server->pushMainToThreadPacket($buffer);
    }

 public function setPortCheck($name)
 {
     $this->interface->sendOption("portChecking", (bool) $name);
 }