ID: 45712
User updated by: for-bugs at hnw dot jp
Reported By: for-bugs at hnw dot jp
Status: Critical
Bug Type: Variables related
Operating System: *
PHP Version: 5.2CVS, 5.3CVS, 6CVS (2008-08-05)
New Comment:
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
$
Previous Comments:
------------------------------------------------------------------------
[2008-08-05 12:33:17] [EMAIL PROTECTED]
That $nan == $nan should be true. (like it is with 5.3)
------------------------------------------------------------------------
[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)
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=45712&edit=1
