Show last child Child category instead of first child category on page

Question

Our website: www.cinemanext.at basically shows the first child category of the category events (click page "events"). Now, page "service" shows category service, which is a child category of events. But service has more levels of child categories.

There is events -> service -> nachwuchsfoerderungen and even one step deeper: events -> service -> nachwuchsfoerderungen -> entwicklung, for example.

Unfortunately, in the grid boxes on the website - the place where the categories are displayed, it always shows the first child category: which is fine for the page "events" (only one level of child categories), but not for the page "service", since it has more than one level of child categories.

Is there a possibility to always display the latest child? In this case:

Service page would show: Service, I click on Nachwuchsförderungen, it should show category nachwuchsfoerderungen (and not service), If I click on Entwicklung, it should show category entwicklung (and not service)...

This code is in functions.php

function cnext_event_cat() {
    static $parent_cat;
    if(! isset($parent_cat))
        $parent_cat = get_category_by_slug('events');
    foreach(get_the_category() as $cat)
        if($cat->category_parent == $parent_cat->cat_ID)
            return $cat;
}

Answer 1

if I understand, you need to display category or taxonomy last child. I think you should use get_terms function for this matter: Get all first childrens from your taxonomy:

$my_childrens_firsts = get_terms( array('taxonomy' => 'your_taxonomy', 
                'hide_empty' => false, 
                'hierarchical' => true,
                'parent'=> $your_cat_id,
                ) );

Now you have to foreach $my_childrens_firsts (foreach($my_childrens_firsts as $key => $first_children)... so you get your $first_children->term_id

still within this foreach and get next childs level, using again get_terms:

$my_childrens_seconds = get_terms( array('taxonomy' => 'your_taxonomy', 
                'hide_empty' => false, 
                'hierarchical' => true,
                'parent'=> $first_children->term_id,
                ) );

and so on...until the sublevel you need.