计算两个时间戳之间的时间差

    //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

    private function timediff($begin_time,$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 = $timediff%86400;取消注释后下一行的变量改为$remain，则是去掉天数后剩余的小时数，分钟及描述同理
    	$hours = intval($timediff/3600);
    	//计算分钟数
    	//$remain = $remain%3600;
    	$mins = intval($timediff/60);
    	//计算秒数
    	$secs = $timediff%60;
    	$res = array("day" => $days,"hour" => $hours,"min" => $mins,"sec" => $secs);
    	return $res;
    }