Jak łatwo dodać niestandardowe taksonomie w WordPressie

Kod

<?php
// Hook into the 'init' action to register a custom taxonomy
add_action('init', 'wp_dudecom_register_custom_taxonomy');

/**
 * Register a custom taxonomy called 'Genre'.
 *
 * This function creates a custom taxonomy for a custom post type or default post type.
 * It is registered with various options to control its behavior.
 */
function wp_dudecom_register_custom_taxonomy() {
    // Labels for the custom taxonomy
    $labels = array(
        'name'              => _x('Genres', 'taxonomy general name', 'textdomain'),
        'singular_name'     => _x('Genre', 'taxonomy singular name', 'textdomain'),
        'search_items'      => __('Search Genres', 'textdomain'),
        'all_items'         => __('All Genres', 'textdomain'),
        'parent_item'       => __('Parent Genre', 'textdomain'),
        'parent_item_colon' => __('Parent Genre:', 'textdomain'),
        'edit_item'         => __('Edit Genre', 'textdomain'),
        'update_item'       => __('Update Genre', 'textdomain'),
        'add_new_item'      => __('Add New Genre', 'textdomain'),
        'new_item_name'     => __('New Genre Name', 'textdomain'),
        'menu_name'         => __('Genre', 'textdomain'),
    );

    // Arguments for the custom taxonomy
    $args = array(
        'hierarchical'      => true, // Set to true for categories, false for tags
        'labels'            => $labels,
        'show_ui'           => true,
        'show_admin_column' => true,
        'query_var'         => true,
        'rewrite'           => array('slug' => 'genre'),
    );

    // Register the taxonomy for the 'post' post type
    register_taxonomy('genre', array('post'), $args);
}

/**
 * Add custom taxonomy to WordPress menu.
 *
 * This function adds the custom taxonomy to the WordPress menu.
 */
add_filter('nav_menu_items_genre', 'wp_dudecom_add_custom_taxonomy_to_menu', 10, 2);

function wp_dudecom_add_custom_taxonomy_to_menu($items, $args) {
    if ($args->theme_location == 'primary') {
        $terms = get_terms(array(
            'taxonomy' => 'genre',
            'hide_empty' => false,
        ));

        foreach ($terms as $term) {
            $items .= '<li><a href="' . get_term_link($term) . '">' . $term->name . '</a></li>';
        }
    }
    return $items;
}
?>