pocketmine\level\format\mcregion\Chunk::__construct PHP Method

    public function __construct($level, CompoundTag $nbt = null)
    {
        if ($nbt === null) {
            $this->provider = $level;
            $this->nbt = new CompoundTag("Level", []);
            return;
        }
        $this->nbt = $nbt;
        if (isset($this->nbt->Entities) and $this->nbt->Entities instanceof ListTag) {
            $this->nbt->Entities->setTagType(NBT::TAG_Compound);
        } else {
            $this->nbt->Entities = new ListTag("Entities", []);
            // $this->nbt->Entities->setTagType(NBT::TAG_Compound);
        }
        if (isset($this->nbt->TileEntities) and $this->nbt->TileEntities instanceof ListTag) {
            $this->nbt->TileEntities->setTagType(NBT::TAG_Compound);
        } else {
            $this->nbt->TileEntities = new ListTag("TileEntities", []);
            $this->nbt->TileEntities->setTagType(NBT::TAG_Compound);
        }
        if (isset($this->nbt->TileTicks) and $this->nbt->TileTicks instanceof ListTag) {
            $this->nbt->TileTicks->setTagType(NBT::TAG_Compound);
        } else {
            $this->nbt->TileTicks = new ListTag("TileTicks", []);
            $this->nbt->TileTicks->setTagType(NBT::TAG_Compound);
        }
        if (!isset($this->nbt->BiomeColors) or !$this->nbt->BiomeColors instanceof IntArrayTag) {
            $this->nbt->BiomeColors = new IntArrayTag("BiomeColors", array_fill(0, 256, 0));
        }
        if (!isset($this->nbt->HeightMap) or !$this->nbt->HeightMap instanceof IntArrayTag) {
            $this->nbt->HeightMap = new IntArrayTag("HeightMap", array_fill(0, 256, 0));
        }
        if (!isset($this->nbt->Blocks)) {
            $this->nbt->Blocks = new ByteArrayTag("Blocks", str_repeat("", 32768));
        }
        if (!isset($this->nbt->Data)) {
            $this->nbt->Data = new ByteArrayTag("Data", $half = str_repeat("", 16384));
            $this->nbt->SkyLight = new ByteArrayTag("SkyLight", $half);
            $this->nbt->BlockLight = new ByteArrayTag("BlockLight", $half);
        }
        $extraData = [];
        if (!isset($this->nbt->ExtraData) or !$this->nbt->ExtraData instanceof ByteArrayTag) {
            $this->nbt->ExtraData = new ByteArrayTag("ExtraData", Binary::writeInt(0));
        } else {
            $stream = new BinaryStream($this->nbt->ExtraData->getValue());
            $count = $stream->getInt();
            for ($i = 0; $i < $count; ++$i) {
                $key = $stream->getInt();
                $extraData[$key] = $stream->getShort(false);
            }
        }
        parent::__construct($level, $this->nbt["xPos"], $this->nbt["zPos"], $this->nbt->Blocks->getValue(), $this->nbt->Data->getValue(), $this->nbt->SkyLight->getValue(), $this->nbt->BlockLight->getValue(), $this->nbt->BiomeColors->getValue(), $this->nbt->HeightMap->getValue(), $this->nbt->Entities->getValue(), $this->nbt->TileEntities->getValue(), $extraData);
        if (isset($this->nbt->Biomes)) {
            $this->checkOldBiomes($this->nbt->Biomes->getValue());
            unset($this->nbt->Biomes);
        }
        unset($this->nbt->Blocks);
        unset($this->nbt->Data);
        unset($this->nbt->SkyLight);
        unset($this->nbt->BlockLight);
        unset($this->nbt->BiomeColors);
        unset($this->nbt->HeightMap);
        unset($this->nbt->Biomes);
    }