pocketmine\tile\Tile::saveNBT PHP Method

    public function saveNBT()
    {
        $this->namedtag->id = new StringTag("id", $this->getSaveId());
        $this->namedtag->x = new IntTag("x", $this->x);
        $this->namedtag->y = new IntTag("y", $this->y);
        $this->namedtag->z = new IntTag("z", $this->z);
    }