Get closest page ID from URL

Question

Lets say on my WordPress website I navigate to:

www.example.com/media-centre/news/17/an-example-news-post

In this case I am looking at a post in a CPT called News.

What I want to do is get the page ID thats closest to that URL. I know the closest page ID can be found at:

www.example.com/media-centre/news/

So how do I loop back over my URL to find the closest page and then how do I get the ID of that page?

Answer 1

You should be able to get the current url from $url = add_query_arg().

Then assuming, the structure: www.example.com/page/subpage/news/ID/post you can use preg_match to extract /page/subpage/news. Then it would be simple matter of using get_page_by_path();.

If that fails you can then check /page/subpage/ and finally /page.

Answer 2

Got there myself with the aid from Stephen Harris and some PHP help over at SO.

$page = get_closest_page();

// echo $page->ID;

function get_closest_page( $url = false )
{
    global $wp;

    if( ! $url )
        $url = $wp->request;

    $page = get_page_by_path( $url );

    if( $page )
        return $page;

    $url = dirname( $url );

    return get_closest_page( $url );
}