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;
    }
 }
?>