WordPress Get Root Page ID

this snipet will show you how to get root page id and title in wordpress!

		global $post;
		$parent_id = $post->post_parent;
		$post_id = $post->ID;
		$ancestors = get_post_ancestors($post_id);
		$root_id = (!empty($ancestors) ? array_pop($ancestors): $post_id);
		$child_of = $root_id;
		$widget_title = get_the_title($root_id);