[Solved] Untar and rename map

I would like to untar and rename map:
I have <server>/map/DarkForest.tar (with level.dat and region/)
I try to untar map to <server>/worlds/HG1 and load it
My code:

PHP:

// I try loadMap("DarkForest", "HG1");
public function loadMap($standartMapName, $customMapName){
        // Server path
        $path = $this->plugin->getServer()->getDataPath();
        // Untar map to worlds
        exec("tar -xf $path/map/$standartMapName.tar -C $path/worlds");
        // Rename to $customName
        exec("mv $path/worlds/$standartMapName $path/worlds/$customMapName");
        $worldPath = "$path/worlds/$customMapName/";
        // Cnange LevelName to $customName in level.dat
        $data = file_get_contents($worldPath."level.dat");
        $nbt = new NBT(NBT::BIG_ENDIAN);
        $nbt->readCompressed($data);
        $nbt->getData()->Data->LevelName = new StringTag("LevelName", $customMapName);
        $this->plugin->getServer()->loadLevel($customMapName);
}

And it's load map with name "DarkForest", whyy?)

 

Because the level name in level.dat is "DarkForest".

 

No

Spoiler: var_dump($nbt)

PHP:

object(pocketmine\nbt\NBT)#15733 (4) {
    ["buffer"]=>
    string(0) ""
    ["offset":"pocketmine\nbt\NBT":private]=>
    int(1225)
    ["endianness"]=>
    int(1)
    ["data":"pocketmine\nbt\NBT":private]=>
    object(pocketmine\nbt\tag\CompoundTag)#15611 (3) {
        ["__name":protected]=>
        string(0) ""
        ["value":protected]=>
        array(0) {
        }
        ["Data"]=>
        object(pocketmine\nbt\tag\CompoundTag)#15636 (40) {
            ["__name":protected]=>
            string(4) "Data"
            ["value":protected]=>
            array(0) {
            }
            ***
            ["LevelName"]=>
            object(pocketmine\nbt\tag\StringTag)#15587 (2) {
                ["__name":protected]=>
                string(9) "LevelName"
                ["value":protected]=>
                string(3) "HG1"
            }
            ***
        }
    }
}


Full var_dump($nbt): http://pastebin.com/iQy19yp2
UPD: Map copy from minecraft pc.

 

Ooops, i miss

PHP:

$nbt = $nbt->writeCompressed();
file_put_contents($worldPath."level.dat", $nbt);       

xD