Bug #71032 [Ver]: Comparison of float NAN returns true

From: Date: Sat, 05 Dec 2015 02:34:26 +0000
Subject: Bug #71032 [Ver]: Comparison of float NAN returns true
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-197609@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=71032&edit=1

 ID:                 71032
 Updated by:         laruence@php.net
 Reported by:        obouda at email dot cz
 Summary:            Comparison of float NAN returns true
 Status:             Verified
 Type:               Bug
 Package:            Variables related
 PHP Version:        7.0.0
 Block user comment: N
 Private report:     N

 New Comment:

that is because fast_is_smaller_* behaviors differently on IS_DOULBE IS_DOUBLE pair from
compare_function.

actually, PHP-5.6 has the same issue if opcache is enabled


Previous Comments:
------------------------------------------------------------------------
[2015-12-05 01:44:51] requinix@php.net

https://3v4l.org/XRDRs

------------------------------------------------------------------------
[2015-12-04 21:20:46] obouda at email dot cz

Description:
------------
Comparison of the float NAN value to any other value is supposed to return false - as the docs of
the float type says.

In PHP 5.4 to 5.6 the result is false, as expected.

In PHP 7.0, the comparison returns true.

Reproduced on Windows 7 (64bit) as well as at https://3v4l.org/GkqZZ

Test script:
---------------
<?php
var_dump(NAN < 1.0);

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

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


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Edit this bug report at https://bugs.php.net/bug.php?id=71032&edit=1

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