post_categories()

nebula()->post_categories($options)

        public function post_categories($options=array()){
            $override = apply_filters('pre_nebula_post_categories', null, $options);
            if ( isset($override) ){return $override;}

            $defaults = apply_filters('nebula_post_categories_defaults', array(
                'id' => get_the_ID(),
                'label' => 'icon', //"icon" or "text"
                'linked' => true, //Link to category archive
                'show_uncategorized' => true, //Show "Uncategorized" category
                'force' => false,
                'string' => false, //Return a string with no markup
            ));

            $data = array_merge($defaults, $options);

            if ( get_theme_mod('post_categories', true) || $data['force'] ){
                $the_categories = get_the_category($data['id']);

                if ( $the_categories && is_array($the_categories) ){
                    //Optionally filter out "Uncategorized"
                    if ( !$data['show_uncategorized'] ){
                        $the_categories = array_filter($the_categories, fn($cat) => $cat->slug !== 'uncategorized');
                    }

                    if ( empty($the_categories) ){return null;}

                    $label = '';
                    $cat_plural = ( count($the_categories) > 1 )? __('categories', 'nebula') : __('category', 'nebula');

                    if ( $data['label'] === 'icon' ){
                        $label = '<i class="nebula-post-categories-label fa-solid fa-list"></i> ';
                    } elseif ( $data['label'] === 'text' ){
                        $label = '<span class="nebula-post-categories-label">' . ucwords($cat_plural) . ' </span>';
                    }

                    //If we just want comma-separated plain text
                    if ( $data['string'] ){
                        $category_names = array_map(fn($cat) => $cat->name, $the_categories);
                        return implode(', ', $category_names);
                    }

                    //Otherwise output individual span tags
                    $category_items = '';
                    $cat_count = count($the_categories);
                    $current = 0;

                    foreach ( $the_categories as $cat ){
                        $cat_name = esc_html($cat->name);
                        $current++;

                        if ( $data['linked'] ){
                            $cat_link = get_category_link($cat->term_id);
                            $category_items .= '<span role="listitem"><a href="' . esc_url($cat_link) . '">' . $cat_name . '</a></span>';
                        } else {
                            $category_items .= '<span role="listitem">' . $cat_name . '</span>';
                        }

                        if ( $current < $cat_count ){
                            $category_items .= ', ';
                        }
                    }

                    return '<span class="posted-in meta-item post-categories" role="list">' . $label . $category_items . '</span>';
                }
            }
        }

add_filter('pre_nebula_post_categories', 'my_custom_post_categories', 10, 2); //The last integer must be 1 more than the actual parameters
function my_custom_post_categories($null, $options){ //$null is required, but can be ignored
    //Write your own code here

    return true; //Return true to prevent the original function from running afterwords
}

 add_filter('pre_nebula_post_categories', '__return_false');