PHP code to calculate the day, hour, minute and second difference between two timestamps

//$begin_time 开始时间戳
//$end_time 结束时间戳
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;
　　$hours = intval($remain/3600);
　　//计算分钟数
　　$remain = $remain%3600;
　　$mins = intval($remain/60);
　　//计算秒数
　　$secs = $remain%60;
　　$res = array("day" => $days,"hour" => $hours,"min" => $mins,"sec" => $secs);
　　return $res;
}