pocketmine\Player::getLoaderId PHP Method

    public function getLoaderId()
    {
        return $this->loaderId;
    }

 public function spawnTo(Player $player)
 {
     if ($player !== $this and !isset($this->hasSpawned[$player->getLoaderId()])) {
         $this->hasSpawned[$player->getLoaderId()] = $player;
         $pk = new AddPlayerPacket();
         $pk->uuid = $this->getUniqueId();
         $pk->username = $this->getName();
         $pk->eid = $this->getId();
         $pk->x = $this->x;
         $pk->y = $this->y;
         $pk->z = $this->z;
         $pk->speedX = 0;
         $pk->speedY = 0;
         $pk->speedZ = 0;
         $pk->yaw = $this->yaw;
         $pk->pitch = $this->pitch;
         $item = $this->getInventory()->getItemInHand();
         $pk->item = $item;
         if ($player->hasPermission("slapper.seeownskin")) {
             $pk->skin = $player->getSkinData();
             $pk->slim = $player->isSkinSlim();
         } else {
             $pk->skin = $this->skin;
             $pk->slim = $this->isSlim;
         }
         $pk->metadata = [2 => [4, $this->getDataProperty(2)], 3 => [0, $this->getDataProperty(3)], 15 => [0, 1]];
         $player->dataPacket($pk->setChannel(Network::CHANNEL_ENTITY_SPAWNING));
         $this->inventory->sendArmorContents($player);
     }
 }