php计算时间差/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 $res;}//======== 实例使用 ========$timediff = timediff( strtotime( "2011-10-28" ), strtotime( "2011-10-29" ) );print_r( $timediff );