像sql Order BY 那样去操作一个多维数组，使得其按数组中指定的键值来排序，相当强大的PHP函数！

　　　　　　　$fanganListInfo = array();
            $upload_time = array();
            foreach ($articleFanganListInfo as $articleFangan){
                $fanganListInfo[]=array(
                    'type'    =>'article',
                    'id'    =>$articleFangan['id'],
                    'title'    =>$articleFangan['title'],
                    'upload_time'=>$articleFangan['add_time'],
                );
            }
            foreach ($dataFanganListInfo as $dataFangan){
                $fanganListInfo[]=array(
                    'type'=>'data',
                    'id'=>$dataFangan['id'],
                    'title'=>$dataFangan['data_title'],
                    'upload_time'=>$dataFangan['upload_time']
                );
            }
            // 取得列的列表
            foreach ($fanganListInfo as $key => $row) {
                $upload_time[$key] = $row['upload_time'];
            }
            // 将数据根据 upload_time 降序排列
            // 把 $fanganListInfo 作为最后一个参数，以通用键排序
            array_multisort($upload_time, SORT_DESC, $fanganListInfo);
            return array_slice($fanganListInfo,0,$limit);