Bug #62264 [Nab]: array_walk not changeing keys

Edit report at https://bugs.php.net/bug.php?id=62264&edit=1 ID: 62264 User updated by: marti dot markov at gmail dot com Reported by: marti dot markov at gmail dot com Summary: array_walk not changeing keys Status: Not a bug Type: Bug Package: Arrays related Operating System: Mac OS X PHP Version: master-Git-2012-06-08 (Git) Block user comment: N Private report: N New Comment: But if it a reference to the variable why should it be change-able? I mean if I pass $key then I understand that I can't change it for example but I'm passing the reference of the key or am I just passing a reference to a clone of the key with &$key? Anyways as I pass a reference it should be expected that if it is changed the variable itself will be changed as well. Therefor the key in the array should be changed (looking at this from ref point of view). Previous Comments: ------------------------------------------------------------------------ [2012-06-08 23:27:09] nikic@php.net As Sjon mentioned this is not a bug. You can't change they key in the callback. You generally can't change the key in a dictionary without a) removing the old key and b) inserting the value under a new key. This behavior is inherent to dictionaries. ------------------------------------------------------------------------ [2012-06-08 12:41:55] Sjon at hortensius dot net The manual says "Only the values of the array may potentially be changed; .... If the callback does not respect this requirement, the behavior of this function is undefined, and unpredictable." I think this could be a feature request, but not really a bug? Also, your test-script is incomplete; but PHP's behavious is pretty consistent regarding this functionality: http://3v4l.org/1dn4f ------------------------------------------------------------------------ [2012-06-08 09:32:25] marti dot markov at gmail dot com Description: ------------ I have found this problem with 5.3.10 and got the latest GIT head revision and the problem was still there. When I try and change the value of the key it will not update it in the array, even though that I use the key as a reference. Test script: --------------- $array = ( 'a' => 'Hello', 'b' => 'World'); array_walk($array, 'adda'); function adda(&$value, &$key) { $key = "a".$key; } Expected result: ---------------- $array = ( 'aa' => 'Hello', 'ab' => 'World'); Actual result: -------------- $array = ( 'a' => 'Hello', 'b' => 'World'); ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=62264&edit=1