php自定义函数: 计算两个时间日期相隔的天数,时,分,秒

function timediff( $begin_time, $end_time ){    if ( $begin_time < $end_time ) {        $starttime = $begin_time;        $endtime = $end_time;    } else {        $starttime = $end_time;        $endtime = $begin_time;    }    $timediff = $endtime - $starttime;    $days = intval( $timediff / 86400 );    $remain = $timediff % 86400;    $hours = intval( $remain / 3600 );    $remain = $remain % 3600;    $mins = intval( $remain / 60 );    $secs = $remain % 60;    $res = array( "day" => $days, "hour" => $hours, "min" => $mins, "sec" => $secs );    return $res;}