pocketmine\level\format\mcregion\RegionLoader::writeLocationIndex PHP Метод

    protected function writeLocationIndex($index)
    {
        fseek($this->filePointer, $index << 2);
        fwrite($this->filePointer, Binary::writeInt($this->locationTable[$index][0] << 8 | $this->locationTable[$index][1]), 4);
        fseek($this->filePointer, 4096 + ($index << 2));
        fwrite($this->filePointer, Binary::writeInt($this->locationTable[$index][2]), 4);
    }