#45712 [NEW]: $something == NaN returns true with PHP 5.3.0, which returns false until 5.2.6

From: Date: Tue, 05 Aug 2008 02:39:58 +0000
Subject: #45712 [NEW]: $something == NaN returns true with PHP 5.3.0, which returns false until 5.2.6
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-127599@lists.php.net to get a copy of this message 
From:             for-bugs at hnw dot jp
Operating system: MacOSX
PHP version:      5.3.0alpha1
PHP Bug Type:     Variables related
Bug description:  $something == NaN returns true with PHP 5.3.0, which returns false until 5.2.6

Description:
------------
There is == operator's problem dealing with NaN(Not a Number) in PHP
5.3.0alpha1. This behavior is different with PHP 5.0.0-5.2.6, so this is
compatibility problem.

Reproduce code:
---------------
<?php

$nan = (-1e300*1e300)/(1e300*1e300); // float(NAN)

var_dump($nan=='');
var_dump($nan==0.5);
var_dump($nan==50);
var_dump($nan=='500');
var_dump($nan=='abc');
var_dump($nan==$nan);

Expected result:
----------------
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)

Actual result:
--------------
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)

-- 
Edit bug report at http://bugs.php.net/?id=45712&edit=1
-- 
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45712&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45712&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45712&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=45712&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=45712&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=45712&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=45712&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=45712&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=45712&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=45712&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=45712&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=45712&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=45712&r=globals
PHP 4 support discontinued:   http://bugs.php.net/fix.php?id=45712&r=php4
Daylight Savings:             http://bugs.php.net/fix.php?id=45712&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=45712&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=45712&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=45712&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=45712&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=45712&r=mysqlcfg

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