php recursive merge

I need to merge some arrays in some different way and I use array_merge_recursive. However there is something that I need to change and I don't know how. Here is quote from php.net

If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended.

I want this value, NOT to be appended, I want not to append exact values in the new array.Hope you've understood this.

Example:

$array = array(
   'some'  => array(
       'other'    => 'key',
   ),
);

$array2 = array();
$array2['some']['other'] = 'key2';

If I use array_merge_recursive It will result this:

Array (
    [some] => Array
        (
            [other] => Array
                (
                    [0] => key
                    [1] => key2
                )
        ) )

I want if it matches the same result, not to append it.Yes I know, you would say, then use array_merge, but it doesn't work well, too. If I use this:

$array = array(
   'some'  => array(
       'other'    => 'key',
   ),
);

$array2 = array();
$array2['some']['other2'] = 'key2';

print_r(array_merge($array, $array2));

It will remove $array[some][other] from the list and leave only $array[some][other2].I don't know which is better, since no one makes it better.