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

 ID:                 45712
 Updated by:         phi...@php.net
 Reported by:        for-bugs at hnw dot jp
 Summary:            $something == NaN returns true with 5.3, false with
                     5.2.*
-Status:             Closed
+Status:             Re-Opened
 Type:               Bug
 Package:            Variables related
 Operating System:   *
 PHP Version:        5.2CVS, 5.3CVS, 6CVS (2008-08-05)
 Assigned To:        tony2001
 Block user comment: N
 Private report:     N

 New Comment:

Reopening because the associated test tests INF as well. However, this
is about INF:



// 5.3.7-dev (and all past PHP versions, afaict)

$inf = pow(0,-2); var_dump($inf==$inf); var_dump($inf===$inf); // false
true



// 5.4.0-dev

$inf = pow(0,-2); var_dump($inf==$inf); var_dump($inf===$inf); // true
true



Please explain.



And @jwvdveer, it was indeed fixed (in 5.3) and made to return false.


Previous Comments:
------------------------------------------------------------------------
[2010-07-28 01:28:53] jwvdveer at gmail dot com

Please, reopen this bug. It's not working in PHP 5.3.3 on Windows
platform (released at 2010-07-21).

The behaviour of a comparison to NAN is the same as noted here.



It's not just a `me too`, but this thread shouln't have been closed.

------------------------------------------------------------------------
[2008-08-07 08:36:33] tony2...@php.net

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.



------------------------------------------------------------------------
[2008-08-07 07:37:04] tony2...@php.net

I'm testing a patch for it.

------------------------------------------------------------------------
[2008-08-05 12:52:06] for-bugs at hnw dot jp

NaN is not exact number. So, NaN should not equals itself. Additionaly,
NaN == NaN is false in C. You can see behavior of C as follows.



$ cat nan.c

int main() {double d;d=(-1e300*1e300)/(1e300*1e300);if (d==d) return 1;
else return 2;}

$ gcc nan.c; ./a.out; echo $?

2

$

------------------------------------------------------------------------
[2008-08-05 12:33:17] j...@php.net

That $nan == $nan should be true. (like it is with 5.3)

------------------------------------------------------------------------


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    http://bugs.php.net/bug.php?id=45712


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