PHP中对日期加减的类，很不错

PHP中对日期操作的函数功能强大，下面的代码是PHP对日期加减的类，很不错，有需要的朋友可以用一下。
如何使用这个类呢？请看下面的演示：

$temptime  = time();
echo   strftime (  "%Hh%M %A %d %b" , $temptime );
$date  =  new  DateAccount();
$temptime  =  $date ->DateAdd( "n"  ,50, $temptime );
echo   "<p>" ;
echo   strftime (  "%Hh%M %A %d %b" , $temptime );

$temptime = time(); echo strftime( "%Hh%M %A %d %b",$temptime); $date = new DateAccount(); $temptime = $date->DateAdd("n" ,50,$temptime); echo "<p>"; echo strftime( "%Hh%M %A %d %b",$temptime);
如果一切顺利，你可以看到以下结果：
15h41 Saturday 03 Jun
16h31 Saturday 03 Jun

$currenttime  = time();
echo   "Current time: " .  strftime ( "%Hh%M %A %d %b"  , $currenttime ). "<br>" ;
$date  =  new  DateAccount();
$newtime  =  $date ->DateAdd ( "n" ,50 , $currenttime );
echo   "Time plus 50 minutes: " .  strftime ( "%Hh%M %A %d %b"  , $newtime ). "<br>" ;
$temptime  =  $date ->DateDiff ( "n" , $currenttime  , $newtime );
echo   "Interval between two times: " . $temptime ;

$currenttime = time(); echo "Current time: ". strftime("%Hh%M %A %d %b" ,$currenttime)."<br>"; $date = new DateAccount(); $newtime = $date->DateAdd ("n",50 ,$currenttime); echo "Time plus 50 minutes: ". strftime("%Hh%M %A %d %b" ,$newtime)."<br>"; $temptime = $date->DateDiff ("n",$currenttime ,$newtime); echo "Interval between two times: ".$temptime;
如果一切顺利，你可以看到以下结果：
Current time: 16h23 Saturday 03 Jun
Time plus 50 minutes: 17h13 Saturday 03 Jun
Interval between two times: 50

<?php
  class  DateAccount{
      function  __construct(){
     }

      function  DateAdd ( $interval , $number ,  $date ) {
         $date_time_array  =  getdate ( $date );
         $hours  =  $date_time_array [ "hours" ];
         $minutes  =  $date_time_array [ "minutes" ];
         $seconds  =  $date_time_array [ "seconds" ];
         $month  =  $date_time_array [ "mon" ];
         $day  =  $date_time_array [ "mday" ];
         $year  =  $date_time_array [ "year" ];
         switch  ( $interval ) {
           case   "yyyy" :  $year  += $number ;  break ;
           case   "q" :  $month  +=( $number *3);  break ;
           case   "m" :  $month  += $number ;  break ;
           case   "y" :
           case   "d" :
           case   "w" :  $day += $number ;  break ;
           case   "ww" :  $day +=( $number *7);  break ;
           case   "h" :  $hours += $number ;  break ;
           case   "n" :  $minutes += $number ;  break ;
           case   "s" :  $seconds += $number ;  break ;
        }
         $timestamp  =  mktime ( $hours  , $minutes ,  $seconds , $month  , $day ,  $year );
         return   $timestamp ;
   }

    function  DateDiff ( $interval , $date1 , $date2 ) {
         $timedifference  =  $date2  -  $date1 ;
         switch  ( $interval ) {
           case   "w" :  $retval  =  bcdiv ( $timedifference  ,604800);  break ;
           case   "d" :  $retval  =  bcdiv (  $timedifference ,86400);  break ;
           case   "h" :  $retval  =  bcdiv  ( $timedifference ,3600);  break ;
           case   "n" :  $retval  =  bcdiv (  $timedifference ,60);  break ;
           case   "s" :  $retval  =  $timedifference ;  break ;
        }
         return   $retval ;
    }
 }
?>