Как сделать сортировку по категориям в фильтр?

elseif( $value != NULL && $value != "" && is_scalar($value) ) {
		if( preg_match( "#^slider-(.+)#is", $key, $matches) ) {
			if( trim($matches[1]) != "" ) {
				$key = $matches[1];
				$value = explode(';', $value);
				$value[1] = $db->safesql($value[1]);
				$value[0] = $db->safesql($value[0]);
				$where[] = "ABS(SUBSTRING_INDEX(SUBSTRING_INDEX(xfields, '{$key}|', -1 ), '||', 1))>={$value[0]} AND ABS(SUBSTRING_INDEX(SUBSTRING_INDEX(xfields, '{$key}|', -1), '||', 1))<={$value[1]}";
			}
		} elseif( preg_match( "#^from-(.+)#is", $key, $matches) ) {
			if( trim($value) != "" ) {
				$key = $matches[1];
				$where[] = "ABS(SUBSTRING_INDEX(SUBSTRING_INDEX(xfields, '{$key}|', -1 ), '||', 1))>={$value}";
			}
		} elseif( preg_match( "#^to-(.+)#is", $key, $matches) ) {
			if( trim($value) != "" ) {
				$key = $matches[1];	
				$where[] = "ABS(SUBSTRING_INDEX(SUBSTRING_INDEX(xfields, '{$key}|', -1), '||', 1))<={$value}";
			}
		} elseif( $key == $find_sort ) {
			$order_by[] = sortSqlFilter($key, $value, $db, $form_field_arr, $sort_by_const);
		} else {
			if ($key != $direction_sort) {
				$value = $db->safesql($value);
				$where[] = "SUBSTRING_INDEX(SUBSTRING_INDEX(xfields,  '{$key}|', -1), '||', 1) LIKE '%{$value}%'";
			}
		}
	}