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Bug #31720 Invalid object callbacks not caught in array_walk()
Submitted: 2005-01-27 13:06 UTC Modified: 2005-02-02 11:38 UTC
From: a at b dot c dot de Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 5.0.3 OS: Windows XP
Private report: No CVE-ID: None
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 [2005-01-27 13:06 UTC] a at b dot c dot de 
Description:
------------
Using array_walk will crash PHP if a method of an uninstantiated object variable is used in the callback method. Other functions that take variables (at least, usort(), array_map(), array_reduce()) error out instead. There has to be at least one element in the array being walked.

Reproduce code:
---------------
$array = array('at least one element');

array_walk($array, array($nonesuchvar,'show'));


Expected result:
----------------
PHP 4.3.10's error message for this situation reads:

Warning:  array_walk(): Unable to call Array() - function does not exist in ...

while PHP 5.0.3 also reports a Notice-level message that $nonesuchvar is undefined.

Actual result:
--------------
A Notice-level message that $nonesuchvar is undefined, then a Windows core dump.

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 [2005-01-28 00:27 UTC] a at b dot c dot de 
I guess I could point out that when I found this I was trying to find some way to call a certain method of each of the array's elements, i.e. call $child->show() for each $child in $children. If there's a way to do this with array_walk() that doesn't involve additional wrapper functions then it eludes me.
 [2005-02-02 11:38 UTC] stas@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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