pocketmine\inventory\BaseInventory::onClose PHP Method

    public function onClose(Player $who)
    {
        unset($this->viewers[spl_object_hash($who)]);
    }

 public function onClose(Player $who)
 {
     $pk = new ContainerClosePacket();
     $pk->windowid = $who->getWindowId($this);
     $who->dataPacket($pk);
     parent::onClose($who);
 }