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

From: Date: Fri, 04 Dec 2015 21:20:47 +0000
Subject: Bug #71032 [NEW]: Comparison of float NAN returns true
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-197598@lists.php.net to get a copy of this message 
From:             obouda at email dot cz
Operating system: Windows
PHP version:      7.0.0
Package:          Unknown/Other Function
Bug Type:         Bug
Bug description:Comparison of float NAN returns true

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)

-- 
Edit bug report at https://bugs.php.net/bug.php?id=71032&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=71032&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=71032&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=71032&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=71032&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=71032&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=71032&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=71032&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=71032&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=71032&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=71032&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=71032&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=71032&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=71032&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71032&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=71032&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=71032&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=71032&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=71032&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=71032&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=71032&r=mysqlcfg

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