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Bug #25943 String comparison with "if"
Submitted: 2003-10-22 01:07 UTC Modified: 2003-10-23 01:24 UTC
From: wolfgang dot wuensch at ww-informatik dot de Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4.3.2 OS: Windows
Private report: No CVE-ID: None
View Developer Edit
 [2003-10-22 01:07 UTC] wolfgang dot wuensch at ww-informatik dot de 
Description:
------------
I compare two strings, who are different from each other.

The if-Statement gives me a "true".

I want a "false".

Reproduce code:
---------------
$val1="020510010404020301";
$val2="020510010404020302";

if( $val1 == $val2  )
{
    echo $val1;
    echo "<br>";
    echo $val2;
    echo "<br>";
    echo "is not good";
}
else {
    echo "yeah";
}

Expected result:
----------------
go into the "else"

Actual result:
--------------
go into the "if"



Note:
var_dump() used with $var1 and $var2 gives me string(18)

strcmp() works fine.

Patches

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 [2003-10-22 01:21 UTC] alan_k@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

php -r \'
$a = \"0205100104040203000000000000001\";
$b = \"0205100104040203000000000000002\";
var_dump($a == $b);\'
== true

php -r \'
$a = \"0205100104040203000000000000001\";
$b = \"0205100104040203000000000000002\";
var_dump($a === $b);\'
== false.

php will cast strings to numbers and compare them.. - depending on your system. the number may be too big to store in an double.. 
- use bcmath or === or strcmp...
 
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