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I have multiple pages with the same name under the different category at my wp site.

The issue I'm having is that it is hard to distinguish which I need in the Appearance > Menus section.

I was therefore looking for a hook to go trough the items, either in the accordion or in the menu items list on the admin page, but unable to found any.

Is there any hook or other way that could help me do this ?

I could of course edit nav-menus.php but it will be overwritten by the future updates.

Thanks in advance

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There are not good/easy hooks to achieve this, but I think this is possible, just needs some work. I can give you general direction and some ideas.

You can use hooks on nav_menu_items_page and nav_menu_items_page_recent to return array of posts with changed title. They both may use the same function, like this

function my_nav_menu_items($posts, $args) {
    foreach ($posts as $post) {
        // get category name or whatever you need for title
        $post->post_title = $post->post_title . " [..CATEGORY..]";
    }
    return $posts;
}
add_filter('nav_menu_items_page', 'my_nav_menu_items', 10, 2);
add_filter('nav_menu_items_page_recent', 'my_nav_menu_items', 10, 2);

But now you have another problem, your updated title will be used as menu link title when you save your menus. To prevent this you may try to add additional hook on wp_insert_post_data or something like that, check for post_type being nav_menu_item and then remove your added category from title value. You some square brackets or distinctive separator to make this easier.

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