How to implement a list of categories of a custom post?

Question

CMS

Making a simple catalog based on Custom Post Type
Created a custom post with the ability to add a category

<?php
// Register Custom Post Type
function custom_post_type_project() {

  $labels = array(
    'name'                  => 'Галерея',
    'singular_name'         => 'Gallery',
    'menu_name'             => 'Галерея',
    'add_new_item'          => 'Добавить новый',
    'add_new'               => 'Добавить новый',
    'new_item'              => 'Новая',
    'edit_item'             => 'Редактировать',
    'update_item'           => 'Обновить',
    'view_item'             => 'Просмотр',
    'view_items'            => 'Посмотреть все',
  );
  
  $rewrite = array(
    'slug'                  => 'gallery',
    'with_front'            => true,
    'pages'                 => false,
    'feeds'                 => false,
  );
  $args = array(
    'label'                 => 'Галерея',
    'labels'                => $labels,
    'supports'              => array( 'title', 'thumbnail', 'editor'),
    'taxonomies'            => array('category'),
    'hierarchical'          => false,
    'public'                => true,
    'show_ui'               => true,
    'show_in_menu'          => true,
    'menu_position'         => 7,
    'menu_icon'             => 'dashicons-format-image',
    'show_in_admin_bar'     => true,
    'show_in_nav_menus'     => true,
    'can_export'            => true,
    'has_archive'           => true,		
    'exclude_from_search'   => true,
    'publicly_queryable'    => true,
    'query_var'             => 'gallery',
    'rewrite'               => $rewrite,
  );
  register_post_type( 'gallery', $args );

}
add_action( 'init', 'custom_post_type_project', 0 );

figured out the output of posts
on the same page, there was a need to display a list of categories in the sidebar,
I added
wp_list_categories ()
but it displays all the categories that are on the site,
you need to display only the categories of this custom post
how to solve throw an idea

Answer 1

<?php
$terms = get_terms( array(
  'taxonomy'      => 'category',
  'orderby'       => 'name', 
  'hide_empty'    => false, 
  'count'         => false,
  'hierarchical'  => true, 
) );
$terms = wp_list_filter( $terms, array('parent'=>0) ); // Если надо вывести только рубрики верхнего уровня
?>
      <?php
        if( $terms && ! is_wp_error($terms) ){
          foreach( $terms as $term ){
            echo "<a href='". get_term_link( (int) $term->term_id, 'category' ) ."'>". $term->name ."</a>";
          }
        }
      ?>