$menu_id, 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'flat_menu', 'menu_id' => '', 'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'items_wrap' => '

%3$s

', 'depth' => 0, 'walker' => new toebox\inc\Walker\NavMenu\Flat() ));