How can I add a page's ID to its permalink using WP_Rewrite?

Question

I have a client who is adamant that the permalink structure for pages must be along the lines of postname/postid, such as test-page/7.

I've gotten as far as adding the post name using $wp_rewrite->page_structure with the following code, which works fine.

add_action( 'init', 'custom_page_rules' );

function custom_page_rules() {
    global $wp_rewrite;

    $wp_rewrite->page_structure = $wp_rewrite->root . '%pagename%'; 
}

However, when I add %post_id%, it is not converted to the page's ID. Examination of the WP_Rewrite class reveals that there is no %page_id% placeholder. Is this possible to do and, if so, how can I achieve it?

Answer 1

You don't need to use any code for this. You just need to:

1. Go to your /wp-admin/options-permalink.php page
2. Select the 'Custom Structure' and enter: /%postname%/%post_id%/
3. Then press the 'Save' button