您可以使用wp_get_nav_menu_items 滤器

add_filter(\'wp_get_nav_menu_items\', \'prefix_add_categories_to_menu\', 10, 3);

然后你可以这样做：

function prefix_add_categories_to_menu($items, $menu, $args) {
    // Make sure we only run the code on the applicable menu
    if($menu->slug !== \'replace_this\' || is_admin()) return $items;

    // Get all the product categories
    $categories = get_categories(array(
        \'taxonomy\' => \'product_cat\',
        \'orderby\' => \'name\',
        \'show_count\' => 0,
        \'pad_counts\' => 0,
        \'hierarchical\' => 1,
        \'hide_empty\' => 1,
        \'depth\' => $depth,
        \'title_li\' => \'\',
        \'echo\' => 0 
    ));

    $menu_items = array();
    // Create menu items
    foreach($categories as $category) {
        $new_item = (object)array(
            \'ID\' => intval($category->term_id),
            \'db_id\' => intval($category->term_id),
            \'menu_item_parent\' => intval($category->category_parent),
            \'post_type\' => "nav_menu_item",
            \'object_id\' => intval($category->term_id),
            \'object\' => "product_cat",
            \'type\' => "taxonomy",
            \'type_label\' => __("Product Category", "textdomain"),
            \'title\' => $category->name,
            \'url\' => get_term_link($category),
            \'classes\' => array()
        );
        array_push($menu_items, $new_item);
    }
    $menu_order = 0;
    // Set the order property
    foreach ($menu_items as &$menu_item) {
        $menu_order++;
        $menu_item->menu_order = $menu_order;
    }
    unset($menu_item);

    return $menu_items;
}

您可以在WordPress中创建一个菜单，然后在函数顶部设置slug，以确保它只在适用的菜单上运行。然后，此功能将用您的所有产品类别替换该菜单中的任何项目。

如果你有大量的类别，我建议使用一个瞬态缓存这个菜单，例如，每天只重新生成一次。