From: robinmessag at hotmail dot com
Operating system: Windows 98SE
PHP version: Irrelevant
PHP Bug Type: Feature/Change Request
Bug description: Mod operator(%) doesn't work with negative integers
Description:
------------
When doing the modulus of a negative number, PHP returns a bogus value.
However, it is clearly doing the modulus, simply returning a negative
answer.
In order to work around, one can add the modulus and mod again, but this
is not a satisfactory solution IMHO.
This bug has been reported before and dismissed, however, modulus on
negative numbers is correct and useful and this should be fixed or at
least documented.
Reproduce code:
---------------
$hour=4;
$timedifference1=-6;
$timedifference2=-30;
$realtime=($hour+$timedifference1)%24;
$realtime2=($hour+$timedifference2)%24;
$realtime3=($hour+$timedifference2)%24;
$realtime3=(24+$realtime3)%24;
echo("The time is:$realtime or maybe $realtime2<BR>");
echo("The correct time is:$realtime3<BR>");
Expected result:
----------------
The time is:22 or maybe 22
The correct time is:22
Actual result:
--------------
The time is:-2 or maybe -2
The correct time is:22
--
Edit bug report at http://bugs.php.net/?id=29732&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=29732&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=29732&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=29732&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=29732&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=29732&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=29732&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=29732&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=29732&r=support
Expected behavior: http://bugs.php.net/fix.php?id=29732&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=29732&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=29732&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=29732&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=29732&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=29732&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=29732&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=29732&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=29732&r=float
