// get category data
    $sql = "select * from mp_service_category";
    $forms = $dao->get_rows($sql);
} else {
    $forms = $_POST;
    // set $forms['mutirow'] array
    if (isset($forms['category_id'])) {
        foreach ($forms['category_id'] as $k => $v) {
            $forms['mutirow'][] = array("id" => $v, "category_name" => $forms['category_name'][$k]);
        }
    }
    if ($forms['mode'] == 'input') {
        // check $forms['mutirow'] items
        $err = new Class_ERROR();
        $index = 0;
        $category_chk = $dao->get_checks();
        foreach ($forms['mutirow'] as $k => $v) {
            $err_mes['category_name'][$index] = $err->check($v['category_name'], $category_chk['category_name']);
            $index = $index + 1;
        }
        // verification check
        // $temp = 1;
        // foreach ($forms ['mutirow'] as $k => $v) {
        // $num = 0;
        // foreach ($forms ['mutirow'] as $kk => $vv){
        // if($v['category_name'] == $vv['category_name']){
        // $num = $num + 1;
        // }
        // }
        // if( $num > 1 ){
        // $err->clear = false;