code: public function serverGetPortById($sid)
      {
          if (!array_key_exists((string)$sid, $this->serverList())) {
              throw new Ts3Exception("invalid serverID", 0x400);
          }
  
          return $this->serverList[intval((string)$sid)]["virtualserver_port"];
      }
docs: Returns the port of a virtual server matching the given ID.
  
  @param  integer $sid
  @throws \Teamspeak3\Ts3Exception
  @return integer