pocketmine\entity\Zombie::getDrops PHP Method

    public function getDrops()
    {
        $lootingL = 0;
        $cause = $this->lastDamageCause;
        $drops = [];
        if ($cause instanceof EntityDamageByEntityEvent and $cause->getDamager() instanceof Player) {
            $lootingL = $cause->getDamager()->getItemInHand()->getEnchantmentLevel(Enchantment::TYPE_WEAPON_LOOTING);
            if (mt_rand(0, 199) < 5 + 2 * $lootingL) {
                switch (mt_rand(0, 3)) {
                    case 0:
                        $drops[] = ItemItem::get(ItemItem::IRON_INGOT, 0, 1);
                        break;
                    case 1:
                        $drops[] = ItemItem::get(ItemItem::CARROT, 0, 1);
                        break;
                    case 2:
                        $drops[] = ItemItem::get(ItemItem::POTATO, 0, 1);
                        break;
                }
            }
            $count = mt_rand(0, 2 + $lootingL);
            if ($count > 0) {
                $drops[] = ItemItem::get(ItemItem::ROTTEN_FLESH, 0, $count);
            }
        }
        return $drops;
    }