Setting a variable inside a function and making it global inside an inner function doesn't work?

Right well I have created this function:

[code]
function getForumChildrenTree( $id )
{
   $id = intval( $id );
   $treeResult = array(
       'topics' => array(),
       'posts' => array(),
       'forums' => array(),
   );
   applyForumChildrenTree( $id );
}
[/code]

What this function does: Basically this function is set to an id of a forum id, then theres a variable that stores an array. Then theres a recursive function called "applyForumChildrenTree" to update the "treeResult" variable, but it's not exactly working. For some reason when I did print_r inside the "applyForumChildrenTree" the array is as applied:

[quote]
Array
(
   [forums] => Array
       (
           [0] => 3
           [1] => 8
           [2] => 5
       )

   [topics] => Array
       (
           [0] => 5
       )

   [posts] => Array
       (
           [0] => 5
       )

)
[/quote]

Then inside the actual function "getForumChildrenTree" I tried outputting the "treeResult" array using "print_r" after the recursive function "applyForumChildrenTree" as follows:

[code]
function getForumChildrenTree( $id )
{
   $id = intval( $id );
   $treeResult = array(
       'topics' => array(),
       'posts' => array(),
       'forums' => array(),
   );
   applyForumChildrenTree( $id );
   print_r($treeResult);
}
[/code]

and it showed me a blank array, (default array I created) as follows:

[quote]
Array
(
   [topics] => Array
       (
       )

   [posts] => Array
       (
       )

   [forums] => Array
       (
       )

)
[/quote]

Is this a bug?  I'm using PHP 5.2.4

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