pocketmine\entity\Entity::sendData PHP Method

    public function sendData($player, array $data = null)
    {
        $pk = new SetEntityDataPacket();
        $pk->eid = $player === $this ? 0 : $this->getId();
        $pk->metadata = $data === null ? $this->dataProperties : $data;
        if (!is_array($player)) {
            $player->dataPacket($pk);
        } else {
            Server::broadcastPacket($player, $pk);
        }
    }