Error when using post_type

Hi

Not sure that i’m posting in the correct area right now.

I do however have a problem when using the post_type parameter in both wp_list_pages and get_pages.

I have a custom post type set up and i want to list both ‘page’ and ‘my_post_type’. From what i can understand it’s not possible to send multiple values in the post_type parameter. So instead i try using the value ‘any’. But that fails aswell.

Simply put, this:

$params = array('post_type'=>'any');
var_dump(get_pages($params));

Returns false and gives a:

( ! ) Notice: Only variable references should be returned by reference in C:\wamp\www\wp-includes\post.php on line 3394

While changing the post_type to ‘page’ works.

Is this a bug or is it intended? And how do i list both my custom post types and the pages hierarchically?

Thanks