Show single post child category from a determined parent

Question

I am trying to show in a single post child category from a selected category. For some single post, I have a category that is corresponding to an area. I want to show that category in a special area of my single post template.

I tried several ways but I can't do it. So far here I am back at the start calling the post categories :

$regions = get_the_category( array(
        'parent' => '62',
    ));

Anyone can help me? Thank you

Answer 1

Well in the end I used custom taxonomy, and it's also more simple to manage. I post as I did :

//hook into the init action and call create_topics_nonhierarchical_taxonomy when it fires
 
add_action( 'init', 'create_regions_nonhierarchical_taxonomy', 0 );
 
function create_regions_nonhierarchical_taxonomy() {
 
// Labels part for the GUI
 
  $labels = array(
    'name' => _x( 'Regions', 'Where are located activities or place of interests' ),
    'singular_name' => _x( 'Region', 'Regions singular name' ),
    'search_items' =>  __( 'Search Regions' ),
    'popular_items' => __( 'Popular Regions' ),
    'all_items' => __( 'All Regions' ),
    'parent_item' => null,
    'parent_item_colon' => null,
    'edit_item' => __( 'Edit Region' ), 
    'update_item' => __( 'Update Region' ),
    'add_new_item' => __( 'Add New Region' ),
    'new_item_name' => __( 'New Region Name' ),
    'separate_items_with_commas' => __( 'Separate regions with commas' ),
    'add_or_remove_items' => __( 'Add or remove regions' ),
    'choose_from_most_used' => __( 'Choose from the most used regions' ),
    'menu_name' => __( 'Regions' ),
  ); 
 
// Now register the non-hierarchical taxonomy like tag
 
  register_taxonomy('regions','post',array(
    'hierarchical' => false,
    'labels' => $labels,
    'show_ui' => true,
    'show_in_rest' => true,
    'show_admin_column' => true,
    'update_count_callback' => '_update_post_term_count',
    'query_var' => true,
    'rewrite' => array( 'slug' => 'region', 'with_front' => false),
  ));
}