Description:
------------
While using array_walk() to apply ksort() to a multidimensional array, I experienced some unusual results. I expected that since each "sub-array" contained identical keys and values that they would all be sorted in the same manner. See the example code/expected output below for more information.

I've tried this on Windows (ver. 5.2.9-2) as well as a Linux box (ver. 5.2.6) and both yielded the same results. If I manually "walk" ksort() through the array, i.e.:
	ksort($test[0]);
	ksort($test[1]);
	ksort($test[2]);
	ksort($test[3]);
	ksort($test[4]);
	ksort($test[5]);
then the results are as expected. I've tried with varying number of array elements in the parent array as well as changing the keys around; no matter what I did, the array in $test[1] was always sorted incorrectly (and unpredictably at that).

Reproduce code:
---------------
<?php
$test = array(
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6'),
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6'),
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6'),
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6'),
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6'),
	array('key' => 'value1', 'this' => 'value2', 'word' => 'value3', 'blah' => 'value4', 'foo' => 'value5', 'bar' => 'value6')
);

array_walk($test, 'ksort');

print_r($test);
?>

Expected result:
----------------
Array
(
    [0] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [1] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [2] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [3] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [4] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [5] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

)

Actual result:
--------------
Array
(
    [0] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [1] => Array
        (
            [foo] => value5
            [bar] => value6
            [blah] => value4
            [word] => value3
            [this] => value2
            [key] => value1
        )

    [2] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [3] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [4] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

    [5] => Array
        (
            [bar] => value6
            [blah] => value4
            [foo] => value5
            [key] => value1
            [this] => value2
            [word] => value3
        )

)