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Bug #53487 (integer) 0 == '_'
Submitted: 2010-12-06 17:45 UTC Modified: 2010-12-06 18:34 UTC
Votes:1
Avg. Score:2.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: kherrera at codealchemy dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: Irrelevant OS: Windows XP SP3
Private report: No CVE-ID: None
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 [2010-12-06 17:45 UTC] kherrera at codealchemy dot com 
Description:
------------
When testing the expression of integer "0" (zero) equals "_" (underscore), the 
result of the expression is true, when it should be false.

I could not select the proper PHP version number because it was not listed:

C:>php -v
PHP 5.3.2 (cli) (built: Mar  3 2010 20:36:54)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans

Test script:
---------------
<?php

    $index = 0;

    if ( $index == '_' )
        echo "Bug found.\n";

    else
        echo "No bug found.\n";

Expected result:
----------------
No bug found.

Actual result:
--------------
Bug found.

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 [2010-12-06 18:07 UTC] pajoye@php.net
-Status: Open +Status: Bogus
 [2010-12-06 18:07 UTC] pajoye@php.net 
use ===. and try echo (int) '_';
 [2010-12-06 18:23 UTC] kherrera at codealchemy dot com 
That's what I'm doing now, but why is this being flagged as bogus?

Zero is not equal to an underscore, typed or not.
 [2010-12-06 18:34 UTC] rasmus@php.net 
Types matter.  What is the integer value of '_' ?  When you are comparing 
different types, one will be cast to the other.  When you cast '_' to an integer 
you get 0.  You either need to force both parameters to be of the same type 
yourself, or you need to use ===
 
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