function timediff($begin_time,$end_time){
        if($begin_time < $end_time){
            $starttime = $begin_time;
            $endtime = $end_time;
        }else{
            $starttime = $end_time;
            $endtime = $begin_time;
        }

        //計算天數
        $timediff = $endtime-$starttime
 
;
        $days = intval($timediff/86400);
        //計算小時數
        $remain = $timediff%86400;
        $hours = intval($remain/3600);
        //計算分鐘數
        $remain = $remain%3600;
        $mins = intval($remain/60);
        //計算秒數
        $secs = $remain%60;
        $res = array("day" => $days,"hour" => $hours,"min" => $mins
 
,"sec" => $secs);
        return $res;
    }