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Bug #27721 array_walk crashes PHP when called recursively
Submitted: 2004-03-26 12:57 UTC Modified: 2004-03-26 14:05 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: madams at morcor dot com Assigned:
Status: Not a bug Package: Arrays related
PHP Version: 4.3.4 OS: windows 2000/2003 server
Private report: No CVE-ID: None
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From: madams at morcor dot com
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 [2004-03-26 12:57 UTC] madams at morcor dot com
Description:
------------
array_walk causes PHP to crash on Windows 2000/2003 server when called recursively.

Reproduce code:
---------------
Please see http://staff.morcor.com/~madams/tmp/bugs.php.net/2004-03-26.array_walk_bug.phps for the source that causes PHP on Windows 2000/2003 server crash.  The script also attempts to load an xml file.  An example XML file is located at
http://staff.morcor.com/~madams/tmp/bugs.php/net/2004-03-26.configuration.xml
Script depends on PEAR.php and PEAR Config.php

Expected result:
----------------
This code should parse the array created by PEAR::Config and define a constant for every value in the array that is not a) an array itself, b) an array with a key of '@' or c) an array that does not have an attribute (sub-array '@') constant marked 'FALSE'.

Actual result:
--------------
Script runs partially, stops and fails to terminate properly.

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 [2004-03-26 13:43 UTC] iliaa@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

Recursive functions will overflow the stack, this is a 
known and unsupported functionality. 
 [2004-03-26 14:05 UTC] madams at morcor dot com
Interestingly enough this code works fine with PHP running in FreeBSD.  Why is that?  Any ideas?
 [2004-06-08 23:29 UTC] aaron dot hawley at uvm dot edu
I'd guess it has to do with FreeBSD == 'Good'.

Fortunately, there is a solution.  One just needs to create your own array_walk function (yes, PHP allows you to write functions!):


    function array_walk_r(&$array, $function, $data = null)
    {
        foreach ($array as $key => $value)
        {
            call_user_func_array($function,
                                 array($value, $key, $data));
            $array[$key] = $value;
        }
    } // end func array_walk_r

It's too bad the PHP folks can't support us more functional-minded folks.
 
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