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Bug #51515 Testing the equality of a string and an int can fails
Submitted: 2010-04-08 23:22 UTC Modified: 2010-04-09 01:34 UTC
From: ianbara at imap dot cc Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.3.2 OS: Ubuntu Linux
Private report: No CVE-ID: None
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 [2010-04-08 23:22 UTC] ianbara at imap dot cc 
Description:
------------
The attached code prints out EQUALS for me. It should not do this. === Does work 
correctly however.

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

$old = "fca4ed9b761ca8ad209293248c2cdb56"; 
$new = 0;

if ($old == $new)
   echo "EQUALS";
else
   echo "NOT EQUALS"

?>

Expected result:
----------------
NOT EQUALS

Actual result:
--------------
EQUALS

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 [2010-04-09 01:05 UTC] felipe@php.net
-Status: Open +Status: Bogus
 [2010-04-09 01:05 UTC] felipe@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
 [2010-04-09 01:27 UTC] ianbara at imap dot cc 
Consider the below code, which returns "EQUALS, NOT EQUALS". If not a bug 
exactly, surely this is not optimal behavior for a language. 

<?php

$old_bad = "fca4ed9b761ca8ad209293248c2cdb56"; 
$old_good = "4ed9b761ca8ad209293248c2cdb56"; 
$new = 0;

if ($old_bad == $new) {
   echo "EQUALS, ";
 } else {
   echo "NOT EQUALS, ";
}

if ($old_good == $new) {
   echo "EQUALS\n";
 } else {
   echo "NOT EQUALS\n";
}

?>
 [2010-04-09 01:34 UTC] rasmus@php.net 
Use === if you want to avoid type-juggling issues like this.  Still not a bug.
 
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