Get page depth in wordpress

functions.php

function get_page_depth($post) {	
	$parent_id  = $post->post_parent;
	$depth = 0;
	while ($parent_id > 0) {
		$page = get_page($parent_id);
		$parent_id = $page->post_parent;
		$depth++;
	}

	return $depth;
}

what about:

function get_page_depth( $post )
{
	$ancestors = get_ancestors( $post->ID, 'page' );

	return count( $ancestors );
}

Regards,

Maarten