Solved Adding items to chest (stacking)

Hey there,

how can I add items to a chest every second?
I got this code:

PHP:

$chest = $this->getMatch()->getMap()->getLevel()->getTile($team->getSpawnChestPos());
$inv = $chest->getInventory();
if($inv->canAddItem($this->item)) {
    $inv->setItem($inv->firstEmpty(), $this->item);
}


And this all gets called every second. But firstEmpty() returns the $index where no item is, but I want that the item stacks. How can I do that?

Make a repeatingTask

Thats not the problem. I got that what I wrote in the first post and that gets called every second. But how can I do it, that the Inventory gets the first place, to add the item? With the first place I mean, the first where the same item is and where it's not full stacked.

PHP:

$chest = $lv->getTile(new Vector3($x,$y,$z));
if ($chest instanceof Chest){
 $chest->getInventory()->addItem(Item::get(1,0,64));
}