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Bug #31458 0 == '%' is true?
Submitted: 2005-01-09 21:51 UTC Modified: 2005-01-09 22:07 UTC
From: falk at brockerhoff dot org Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 4.3.10 OS: FreeBSD 5.3
Private report: No CVE-ID: None
View Developer Edit
 [2005-01-09 21:51 UTC] falk at brockerhoff dot org 
Description:
------------
I got a strange problem while comparing a numeric while with the string "%". Using the numeric value 0 and the string "%" in an if-statement results with true!?



Reproduce code:
---------------
$foo = '%';
$bar = 0;

if ($foo == $var)
{
  echo "what the hell is going on?!\n";
}

$foo = '%';
$bar = '0';

if ($foo == $var)
{
  echo "what the hell is going on?!\n";
}

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 [2005-01-09 21:58 UTC] tony2001@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

Use === to compare variables of different types and read the documentation about type juggling.
 [2005-01-09 22:00 UTC] falk at brockerhoff dot org 
Oh, it's not a bug, it's a feature:

http://www.php.net/manual/en/language.operators.comparison.php
 [2005-01-09 22:07 UTC] johannes@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

Quoting 
http://de2.php.net/manual/en/language.operators.comparison.php 
 
\"If you compare an integer with a string, the string is 
converted to a number. If you compare two numerical 
strings, they are compared as integers. These rules also 
apply to the switch statement.\"
 
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