Bug #54842 [NEW]: ceil yields a negative zero

From: Date: Wed, 18 May 2011 15:24:07 +0000
Subject: Bug #54842 [NEW]: ceil yields a negative zero
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-160818@lists.php.net to get a copy of this message 
From:             
Operating system: Windows XP32
PHP version:      5.3.6
Package:          *Math Functions
Bug Type:         Bug
Bug description:ceil yields a negative zero

Description:
------------
When doing some math with dates and "ceiling" the result, I got a negative
zero!
I don't understand how that can be, so I presume it's an error.

Test script:
---------------
<?php

$dt = mktime (0, 0, 0, 5, 18, 2011);
$base = mktime (16, 16, 0, 5, 18, 2011);

echo 'dt: ', date ('Y-m-d', $dt), '<br />';
echo 'base: ', date ('Y-m-d', $base), '<br />';

echo '<br />';
echo 'dt - base: <strong>', ceil (($dt - $base) / 86400),
'</strong>';

?>
<br /><br />
It outputs "-0" on PHP 5.3.6, under Windows XP 32 bits

Expected result:
----------------
The bolded text should be "0" (zero)

Actual result:
--------------
The bolded text is "-0" (negative zero)

-- 
Edit bug report at http://bugs.php.net/bug.php?id=54842&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=54842&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=54842&r=trysnapshot53
Try a snapshot (trunk):              http://bugs.php.net/fix.php?id=54842&r=trysnapshottrunk
Fixed in SVN:                        http://bugs.php.net/fix.php?id=54842&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54842&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=54842&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=54842&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=54842&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=54842&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=54842&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=54842&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=54842&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=54842&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=54842&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=54842&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=54842&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=54842&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=54842&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=54842&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=54842&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=54842&r=mysqlcfg

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