how to find ID of main page when on a sub-sub-page?

  • I’m building a WordPress-based website where I have a horizontal main navigation bar, and a sidebar listing all pages starting from second level for the respective top level page. While the main bar is no problem, I need to find a way to display only the second level pages and below of the current “main page”.

    There is a parameter child_of for wp_list_pages(), and there is the $post class with for ID and post_parent properties. But in order to get it work on third level pages, there would be the need to find out the ID of the top level page.

    How can I find out the ID of a any page’s root page? Thanks for any ideas.

    (btw, a similar problem has been discussed here, but with no solution.)

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  • Anyone found a way to accomplish this? I would really need this type of function, but I am not sure how to backtrack each page parent!

    Ok, I made a hybrid of another, lookalike script:

    function get_root($id) {
	global $post, $wp_query, $wpdb;
	$parent = 1;
	while($parent) {
		$page_query = $wpdb->get_row("SELECT ID, post_parent FROM $wpdb->posts WHERE ID = '$id'");
		$parent = $id = $page_query->post_parent;
		if($parent)
 		   $last = $page_query->post_parent;
	}
	return $last;
}
$current_page = $wp_query->get_queried_object_id();
$root_page = get_root($current_page);
Viewing 2 replies - 1 through 2 (of 2 total)
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