discuz的image类使用

//文件域的名字
//处理方法
//新图
            if(!empty($_FILES['attach']['tmp_name']) && is_uploaded_file($_FILES['attach']['tmp_name'])){
                $query = DB::query("select filename,filepath from pre_home_hall_pic where picid =$picid ");
                while ($value = DB::fetch($query)) {
                    $oldfilepath=$value['filepath'];
                    $filename =$value['filename'];
                }
                $file_info = pathinfo($_FILES['attach']['name']);
                $ext = $file_info['extension'];// 取扩展名

                $filepath = dirname($oldfilepath).'/'.date('His').strtolower(random(16)).'.'.$ext;//随机重命名
                $uploadpath = 'data/attachment/hall/'.$filepath;
                if(!is_dir('data/attachment/hall/'.$oldfilepath)){
                    unlink('data/attachment/hall/'.$oldfilepath);
                    unlink('data/attachment/hall/'.$oldfilepath.'.thumb.jpg');
                }
                $res = move_uploaded_file($_FILES['attach']['tmp_name'], $uploadpath);
                if($res){
                    require_once libfile('class/image');
                    $image = new image();
                    $result = $image->Thumb($uploadpath, '', 140, 140, 1);
                }
                $data['filename'] = $_FILES['attach']['name'];
                $data['filepath'] = $filepath;
            }
            DB::update('home_hall_pic', $data, $wherearr);