#45712 [Opn->Ctl]: $something == NaN returns true with 5.3, false with 5.2.*

From:	jani@php.net	Date:	Tue, 05 Aug 2008 11:14:35 +0000
Subject:	#45712 [Opn->Ctl]: $something == NaN returns true with 5.3, false with 5.2.*
References:	1	Groups:	php.bugs
Request:	Send a blank email to php-bugs+get-127615@lists.php.net to get a copy of this message

 ID:               45712
 Updated by:       jani@php.net
-Summary:          $something == NaN returns true with PHP 5.3.0, which
                   returns false until 5.2.6
 Reported By:      for-bugs at hnw dot jp
-Status:           Open
+Status:           Critical
 Bug Type:         Variables related
-Operating System: MacOSX
+Operating System: *
 PHP Version:      5.3.0alpha1


Previous Comments:
------------------------------------------------------------------------

[2008-08-05 02:39:58] for-bugs at hnw dot jp

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 this bug report at http://bugs.php.net/?id=45712&edit=1



   

Thread (10 messages)

• for-bugs at hnw dot jpTue, 05 Aug 2008 02:39:58 +0000
  • jani@php.netTue, 05 Aug 2008 11:14:35 +0000#45712 [Opn->Ctl]: $something == NaN returns true with 5.3, false with 5.2.*
  • jani@php.netTue, 05 Aug 2008 12:33:18 +0000#45712 [Ctl]: $something == NaN returns true with 5.3, false with 5.2.*
  • for-bugs at hnw dot jpTue, 05 Aug 2008 12:52:06 +0000#45712 [Ctl]: $something == NaN returns true with 5.3, false with 5.2.*
  • tony2001@php.netThu, 07 Aug 2008 07:37:05 +0000#45712 [Ctl->Asn]: $something == NaN returns true with 5.3, false with 5.2.*
  • tony2001@php.netThu, 07 Aug 2008 08:36:34 +0000#45712 [Asn->Csd]: $something == NaN returns true with 5.3, false with 5.2.*
  • jwvdveer at gmail dot comTue, 27 Jul 2010 23:28:54 +0000Bug #45712 [Com]: $something == NaN returns true with 5.3, false with 5.2.*
  • philip@php.netThu, 26 May 2011 05:59:24 +0000Bug #45712 [Csd->ReO]: $something == NaN returns true with 5.3, false with 5.2.*
  • cmbecker69 at gmx dot deMon, 16 Sep 2013 16:48:45 +0000Bug #45712 [Com]: $something == NaN returns true with 5.3, false with 5.2.*
  • nikic@php.netSat, 15 Feb 2014 23:12:45 +0000Bug #45712 [ReO->Csd]: $something == NaN returns true with 5.3, false with 5.2.*