From:             
Operating system: Linux
PHP version:      5.3.10
Package:          Arrays related
Bug Type:         Bug
Bug description:warning in usort when calling debug_backtrace

Description:
------------
When I call a function debug_backtrace() in usort() callback, it triggers 
unrelated warning. 

When i var_dump() it's result, it's OK.


Verified on my mashine
$ php -v
PHP 5.3.11-dev (cli) (built: Mar  1 2012 16:31:39) 

and on my friend's mashine with 5.3.5

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

error_reporting(E_ALL | E_STRICT);

$versions = array('1', '2');

usort($versions, function ($me, $him) {
        debug_backtrace(FALSE);
        return 1;
});


Expected result:
----------------
No warning

Actual result:
--------------
Warning: usort() [function.usort]: Array was modified by the user
comparison 
function in /home/hosiplan/develop/testing/php/backtrace.error.php on line
18

-- 
Edit bug report at https://bugs.php.net/bug.php?id=61736&edit=1
-- 
Try a snapshot (PHP 5.4):            
https://bugs.php.net/fix.php?id=61736&r=trysnapshot54
Try a snapshot (PHP 5.3):            
https://bugs.php.net/fix.php?id=61736&r=trysnapshot53
Try a snapshot (trunk):              
https://bugs.php.net/fix.php?id=61736&r=trysnapshottrunk
Fixed in SVN:                        
https://bugs.php.net/fix.php?id=61736&r=fixed
Fixed in SVN and need be documented: 
https://bugs.php.net/fix.php?id=61736&r=needdocs
Fixed in release:                    
https://bugs.php.net/fix.php?id=61736&r=alreadyfixed
Need backtrace:                      
https://bugs.php.net/fix.php?id=61736&r=needtrace
Need Reproduce Script:               
https://bugs.php.net/fix.php?id=61736&r=needscript
Try newer version:                   
https://bugs.php.net/fix.php?id=61736&r=oldversion
Not developer issue:                 
https://bugs.php.net/fix.php?id=61736&r=support
Expected behavior:                   
https://bugs.php.net/fix.php?id=61736&r=notwrong
Not enough info:                     
https://bugs.php.net/fix.php?id=61736&r=notenoughinfo
Submitted twice:                     
https://bugs.php.net/fix.php?id=61736&r=submittedtwice
register_globals:                    
https://bugs.php.net/fix.php?id=61736&r=globals
PHP 4 support discontinued:          
https://bugs.php.net/fix.php?id=61736&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=61736&r=dst
IIS Stability:                       
https://bugs.php.net/fix.php?id=61736&r=isapi
Install GNU Sed:                     
https://bugs.php.net/fix.php?id=61736&r=gnused
Floating point limitations:          
https://bugs.php.net/fix.php?id=61736&r=float
No Zend Extensions:                  
https://bugs.php.net/fix.php?id=61736&r=nozend
MySQL Configuration Error:           
https://bugs.php.net/fix.php?id=61736&r=mysqlcfg

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