pocketmine\nbt\NBT::writeTag PHP Метод

    public function writeTag(Tag $tag)
    {
        $this->putByte($tag->getType());
        if ($tag instanceof NamedTAG) {
            $this->putString($tag->getName());
        }
        $tag->write($this);
    }

 public function write(NBT $nbt)
 {
     foreach ($this as $tag) {
         if ($tag instanceof Tag and !$tag instanceof End) {
             $nbt->writeTag($tag);
         }
     }
     $nbt->writeTag(new End());
 }