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Bug #50745 INF==INF evals to FALSE
Submitted: 2010-01-14 08:33 UTC Modified: 2010-01-14 10:09 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: alvaro at demogracia dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.3.2RC1 OS: Windows
Private report: No CVE-ID: None
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From: alvaro at demogracia dot com
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 [2010-01-14 08:33 UTC] alvaro at demogracia dot com 
Description:
------------
The INF==INF comparison evals to FALSE in 5.3.1 and 5.3.2RC1 Windows releases. It used to be TRUE in previous versions including 5.3.0 and 5.2.11. I've tested it in Windows XP and Windows Server 2008.

It's also FALSE in 5.2.10 under Red Hat Enterprise Linux 5.

The strict comparison INF===INF evals to TRUE in all cases.

Please note I'm referring to the INF numeric constant, not an 'INF' string.

Reproduce code:
---------------
<?php

var_dump(INF==INF);

?>


Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)

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 [2010-01-14 10:09 UTC] jani@php.net 
This is because there was bug in handling INF (and NaN) in Windows prior to 5.3.1 which was fixed. And yes, that's the _expected_ result too. You can't compare infinity to infinity.
 
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