switch (Req::val('topic')) {
    case 'clo': $orderby = 'date_closed'; $closed = 0;
                $title   = 'Recently closed tasks';
    break;

    case 'edit':$orderby = 'last_edited_time'; $closed = 1;
                $title   = 'Recently edited tasks';
    break;

    default:    $orderby = 'date_opened'; $closed = 1;
                $title   = 'Recently opened tasks';
    break;
}