public function emptyCart()
{
$session = Factory::getSession();
$session->set('cart', array(), 'phocaCart');
//if((int)$this->user->id > 0) {
// this function to empty cart database is not use in POS, so always set ticketid, unitid and sectionid to 1
//PhocacartCartDb::emptyCartDb((int)$this->user->id);
//}
PhocacartCartDb::emptyCartDb((int) $this->user->id, (int) $this->vendor->id, (int) $this->ticket->id, (int) $this->unit->id, (int) $this->section->id);
}