我想这是一个我忽略了语法或基本设置的场景。但我已经看了很多遍了，我需要新鲜的眼睛。

我有以下代码，其中添加了一个产品CPT、一个产品组分类法（tag）和一个产品类别分类法。

产品和产品组显示在外观上>；菜单，产品类别没有。帮助

// Register Custom Post Type
function products_post_type() {

    $labels = array(
        \'name\'                  => _x( \'Products\', \'Post Type General Name\', \'text_domain\' ),
        \'singular_name\'         => _x( \'Product\', \'Post Type Singular Name\', \'text_domain\' ),
        \'menu_name\'             => __( \'Products\', \'text_domain\' ),
        \'name_admin_bar\'        => __( \'Product\', \'text_domain\' ),
        \'archives\'              => __( \'Item Archives\', \'text_domain\' ),
        \'attributes\'            => __( \'Item Attributes\', \'text_domain\' ),
        \'parent_item_colon\'     => __( \'Parent Product:\', \'text_domain\' ),
        \'all_items\'             => __( \'All Products\', \'text_domain\' ),
        \'add_new_item\'          => __( \'Add New Product\', \'text_domain\' ),
        \'add_new\'               => __( \'New Product\', \'text_domain\' ),
        \'new_item\'              => __( \'New Item\', \'text_domain\' ),
        \'edit_item\'             => __( \'Edit Product\', \'text_domain\' ),
        \'update_item\'           => __( \'Update Product\', \'text_domain\' ),
        \'view_item\'             => __( \'View Product\', \'text_domain\' ),
        \'view_items\'            => __( \'View Items\', \'text_domain\' ),
        \'search_items\'          => __( \'Search products\', \'text_domain\' ),
        \'not_found\'             => __( \'No products found\', \'text_domain\' ),
        \'not_found_in_trash\'    => __( \'No products found in Trash\', \'text_domain\' ),
        \'featured_image\'        => __( \'Featured Image\', \'text_domain\' ),
        \'set_featured_image\'    => __( \'Set featured image\', \'text_domain\' ),
        \'remove_featured_image\' => __( \'Remove featured image\', \'text_domain\' ),
        \'use_featured_image\'    => __( \'Use as featured image\', \'text_domain\' ),
        \'insert_into_item\'      => __( \'Insert into item\', \'text_domain\' ),
        \'uploaded_to_this_item\' => __( \'Uploaded to this item\', \'text_domain\' ),
        \'items_list\'            => __( \'Items list\', \'text_domain\' ),
        \'items_list_navigation\' => __( \'Items list navigation\', \'text_domain\' ),
        \'filter_items_list\'     => __( \'Filter items list\', \'text_domain\' ),
    );
    $args = array(
        \'label\'                 => __( \'Product\', \'text_domain\' ),
        \'description\'           => __( \'Product information pages.\', \'text_domain\' ),
        \'labels\'                => $labels,
        \'supports\'              => array( \'title\', \'editor\', \'thumbnail\', \'comments\', \'custom-fields\' ),
        \'taxonomies\'            => array( \'product_category\' ),
        \'hierarchical\'          => false,
        \'public\'                => true,
        \'show_ui\'               => true,
        \'show_in_menu\'          => true,
        \'menu_position\'         => 5,
        \'menu_icon\'             => \'dashicons-chart-line\',
        \'show_in_admin_bar\'     => true,
        \'show_in_nav_menus\'     => true,
        \'can_export\'            => true,
        \'has_archive\'           => true,
        \'exclude_from_search\'   => false,
        \'publicly_queryable\'    => true,
        \'capability_type\'       => \'page\',
    );
    register_post_type( \'products\', $args );

}
add_action( \'init\', \'products_post_type\', 0 );

if ( ! function_exists( \'product_category\' ) ) {

// Register Custom Taxonomy
function product_category() {

    $labels = array(
        \'name\'                       => _x( \'Product Categories\', \'Taxonomy General Name\', \'text_domain\' ),
        \'singular_name\'              => _x( \'Product Category\', \'Taxonomy Singular Name\', \'text_domain\' ),
        \'menu_name\'                  => __( \'Product Categories\', \'text_domain\' ),
        \'all_items\'                  => __( \'All Categories\', \'text_domain\' ),
        \'parent_item\'                => __( \'Parent Category\', \'text_domain\' ),
        \'parent_item_colon\'          => __( \'Parent Category:\', \'text_domain\' ),
        \'new_item_name\'              => __( \'New Category Name\', \'text_domain\' ),
        \'add_new_item\'               => __( \'Add New Category\', \'text_domain\' ),
        \'edit_item\'                  => __( \'Edit Category\', \'text_domain\' ),
        \'update_item\'                => __( \'Update Category\', \'text_domain\' ),
        \'view_item\'                  => __( \'View Category\', \'text_domain\' ),
        \'separate_items_with_commas\' => __( \'Separate categories with commas\', \'text_domain\' ),
        \'add_or_remove_items\'        => __( \'Add or remove categories\', \'text_domain\' ),
        \'choose_from_most_used\'      => __( \'Choose from the most used\', \'text_domain\' ),
        \'popular_items\'              => __( \'Popular Categories\', \'text_domain\' ),
        \'search_items\'               => __( \'Search Categories\', \'text_domain\' ),
        \'not_found\'                  => __( \'Not Found\', \'text_domain\' ),
        \'no_terms\'                   => __( \'No categories\', \'text_domain\' ),
        \'items_list\'                 => __( \'Categories list\', \'text_domain\' ),
        \'items_list_navigation\'      => __( \'Categories list navigation\', \'text_domain\' ),
    );
    $args = array(
        \'labels\'                     => $labels,
        \'hierarchical\'               => true,
        \'public\'                     => true,
        \'show_ui\'                    => true,
        \'show_admin_column\'          => true,
        \'show_in_nav_menus\'          => true,
        \'show_tagcloud\'              => false,
    );
    register_taxonomy( \'product_category\', array( \'products\' ), $args );

}
add_action( \'init\', \'product_category\', 0 );

}

if ( ! function_exists( \'product_group\' ) ) {

// Register Custom Taxonomy
function product_group() {

    $labels = array(
        \'name\'                       => _x( \'Product Groups\', \'Taxonomy General Name\', \'text_domain\' ),
        \'singular_name\'              => _x( \'Product Group\', \'Taxonomy Singular Name\', \'text_domain\' ),
        \'menu_name\'                  => __( \'Product Group\', \'text_domain\' ),
        \'all_items\'                  => __( \'All Product Groups\', \'text_domain\' ),
        \'parent_item\'                => __( \'Parent Item\', \'text_domain\' ),
        \'parent_item_colon\'          => __( \'Parent Item:\', \'text_domain\' ),
        \'new_item_name\'              => __( \'New Product Group\', \'text_domain\' ),
        \'add_new_item\'               => __( \'Add New Product Group\', \'text_domain\' ),
        \'edit_item\'                  => __( \'Edit Product Group\', \'text_domain\' ),
        \'update_item\'                => __( \'Update Product Group\', \'text_domain\' ),
        \'view_item\'                  => __( \'View Product Group\', \'text_domain\' ),
        \'separate_items_with_commas\' => __( \'Separate Product Groups with commas\', \'text_domain\' ),
        \'add_or_remove_items\'        => __( \'Add or remove Product Groups\', \'text_domain\' ),
        \'choose_from_most_used\'      => __( \'Choose from the most used\', \'text_domain\' ),
        \'popular_items\'              => __( \'Popular Product Groups\', \'text_domain\' ),
        \'search_items\'               => __( \'Search Product Groups\', \'text_domain\' ),
        \'not_found\'                  => __( \'Not Found\', \'text_domain\' ),
        \'no_terms\'                   => __( \'No Product Groups\', \'text_domain\' ),
        \'items_list\'                 => __( \'Product Groups list\', \'text_domain\' ),
        \'items_list_navigation\'      => __( \'Product Groups list navigation\', \'text_domain\' ),
    );
    $rewrite = array(
        \'slug\'                       => \'product-group\',
        \'with_front\'                 => true,
        \'hierarchical\'               => false,
    );
    $args = array(
        \'labels\'                     => $labels,
        \'hierarchical\'               => false,
        \'public\'                     => true,
        \'show_ui\'                    => true,
        \'show_admin_column\'          => true,
        \'show_in_nav_menus\'          => true,
        \'show_tagcloud\'              => true,
        \'rewrite\'                    => $rewrite,
    );
    register_taxonomy( \'product_group\', array( \'products\' ), $args );

}
add_action( \'init\', \'product_group\', 0 );

}