php计算时间差时分秒

    /**
     * 想求两个时间间隔的小时数就用:$c/(60*60)
     * PHP 计算两个时间戳之间相差的时间 时分秒
     * 功能：计算两个时间戳之间相差的日时分秒
     * $begin_time  开始时间戳
     * $end_time 结束时间戳
     */
    public function diff($begin_time,$end_time)
    {
        if($begin_time < $end_time){
            $starttime = $begin_time;
            $endtime = $end_time;
        }else{
            $starttime = $end_time;
            $endtime = $begin_time;
        }
        //计算天数
        $timeDiff = $endtime-$starttime;
//        $days = intval($timediff/86400);
        //计算小时数
        $remain = $timeDiff%86400;
        $hours = intval($remain/3600);
        //计算分钟数
        $remain = $remain%3600;
        $mins = intval($remain/60);
        //计算秒数
        $secs = $remain%60;
        $hours = str_pad($hours,2,"0",STR_PAD_LEFT);
        $mins = str_pad($mins,2,"0",STR_PAD_LEFT);
        $secs = str_pad($secs,2,"0",STR_PAD_LEFT);
        $info = $hours.":".$mins.":".$secs;

        return $info;
    }