Filter apply to more categories

if(empty($filter->filter_id)) {
			$filter->filter_namekey=$filter->filter_name;
			$search = explode(",","ç,æ,œ,á,é,í,ó,ú,à,è,ì,ò,ù,ä,ë,ï,ö,ü,ÿ,â,ê,î,ô,û,å,e,i,ø,u");
			$replace = explode(",","c,ae,oe,a,e,i,o,u,a,e,i,o,u,a,e,i,o,u,y,a,e,i,o,u,a,e,i,o,u");
			$test = str_replace($search, $replace, $filter->filter_namekey);
			$test = preg_replace('#[^a-z0-9_-]#i','',$test);

			if(empty($test)) {
				$query = 'SELECT MAX(`filter_id`) FROM '.hikashop_table('filter');
				$this->database->setQuery($query);
				$last_pid = (int)$this->database->loadResult() + 1;
				$filter->filter_namekey = 'filter_'.$last_pid;
			} else {
				$query = 'SELECT filter_id FROM '.hikashop_table('filter').' WHERE filter_namekey  = '.$this->database->Quote($filter->filter_name).' AND filter_id!='.(int)$filter->filter_id.' LIMIT 1';
				$this->database->setQuery($query);
				if($this->database->loadResult()) {
					$app = JFactory::getApplication();
					$app->enqueueMessage(JText::_('DUPLICATE_PRODUCT'), 'error');
					JRequest::setVar('fail', $filter);
					return false;
				}
				$test = str_replace($search, $replace, $filter->filter_name);
				$filter->filter_namekey = preg_replace('#[^a-z0-9_-]#i','_',$test);
			}
		}

if(empty($filter->filter_id)) {
			$filter->filter_namekey=$filter->filter_name;
			$search = explode(",","ç,æ,œ,á,é,í,ó,ú,à,è,ì,ò,ù,ä,ë,ï,ö,ü,ÿ,â,ê,î,ô,û,å,e,i,ø,u");
			$replace = explode(",","c,ae,oe,a,e,i,o,u,a,e,i,o,u,a,e,i,o,u,y,a,e,i,o,u,a,e,i,o,u");
			$test = str_replace($search, $replace, $filter->filter_namekey);
			$filter->filter_namekey = preg_replace('#[^a-z0-9_-]#i','',$test);

			if(empty($test)) {
				$filter->filter_namekey = 'filter';
			}
			$query = 'SELECT MAX(`filter_id`) FROM '.hikashop_table('filter');
			$this->database->setQuery($query);
			$last_pid = (int)$this->database->loadResult() + 1;
			$filter->filter_namekey .= '_'.$last_pid;
		}