Spawn chest

Hello,

Im trying to spawn a chest but im failing a lot. Here is my code. could please someone explain why its not working?

PHP:

$nbt = new Compound(false,[
new Enum("Items", []),
new String("id", Tile::CHEST),
new Int("x", $pos->getX() + $pos->getX()),
new Int("y", $pos->getY() + $pos->getY()),new Int("z", $pos->getZ() + $pos->getZ())]);
$nbt->setName("random");
$chest = new Chest($level->getChunk((($pos->getX() + $pos->getX() >> 4)), (($pos->getZ() + $pos->getX()) >> 4)), $nbt);
$level->addTile($chest);


What? $pos->getX() + $pos->getX()? Can you explain it?

oh please ignore this. Im now on this Code but it wont spawn a chest.

PHP:

$nbt = new Compound(false,
        [
            new Enum("Items", []),
            new String("id", Tile::CHEST),
            new Int("x", $pos->getX()),
            new Int("y", $pos->getY()),
            new Int("z", $pos->getZ())
        ]
        );
        $nbt->setName("random");
        $chest = new Chest($level->getChunk($pos->getX() >> 4, $pos->getZ() >> 4), $nbt);
        $tile = $chest->createTile(Tile::CHEST, $level->getChunk($pos->getX() >> 4, $pos->getZ() >> 4), $nbt, true);
        $level->addTile($tile);
        $chest->spawnToAll();