Description:
------------
array_change_key_case does not change array keys when utf8 encoded.

PHP Version 4.3.10

'./configure' '--prefix=/usr/local/php' '--with-config-file-path=/usr/local/apache/conf' '--with-apxs=/usr/local/apache/bin/apxs' '--with-sybase-ct=/opt/sybase' '--with-ldap=/usr' '--with-gdbm=/usr' '--with-dba' '--enable-shmop' '--enable-sysvsem' '--with-gd' '--with-zlib-dir=/usr' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--with-imap=./imap-patched' '--enable-sockets' '--with-freetype-dir=/usr' '--with-dom'

Reproduce code:
---------------
Testcase:

$test_array = array(	"?ber" => 1,
 			"?ber" => 2);
print "<pre>";print_r($test_array);print "</pre>";
$test_array = array_change_key_case($test_array,CASE_LOWER);
print "<pre>";print_r($test_array);print "</pre>";

Expected result:
----------------
Array
(
    [?ber] => 1
    [?ber] => 2
)

Array
(
    [?ber] => 2
)

Actual result:
--------------
Array
(
    [?ber] => 1
    [?ber] => 2
)

Array
(
    [?ber] => 1
    [?ber] => 2
)