pocketmine\inventory\BaseInventory::first PHP Метод

    public function first(Item $item)
    {
        $count = max(1, $item->getCount());
        $checkDamage = $item->getDamage() === null ? false : true;
        $checkTags = $item->getCompoundTag() === null ? false : true;
        foreach ($this->getContents() as $index => $i) {
            if ($item->equals($i, $checkDamage, $checkTags) and $i->getCount() >= $count) {
                return $index;
            }
        }
        return -1;
    }