How to get top parent page ID in wordpress

The solution to get the top parent page id is here, it is quite easy.

function wp_get_top_parent_page_id() {

    global $post;

    // Check if page is a child page
    if ($post->ancestors) {

    //  Grab the ID of top-level page from the tree
    return end($post->ancestors);

    } else {

    // Page is the top level, so use  it’s own id
    //return $post->ID;
    return 1;

    }

    }

echo wp_get_top_parent_page_id();