if(
            !is_null($search_startorder_id) AND 
            !is_null($search_endorder_id)) AND
            preg_match('/^[0-9]+$/',$search_startorder_id) AND 
            preg_match('/^[0-9]+$/',$search_endorder_id) 
        ){
            if ($where != '') {
                $where.= ' AND ';
            }
            $where.= " order_id BETWEEM ". $search_startorder_id ." AND ".$search_endorder_id."";
        }