WordPress: One Page nav menu

<?php
//Coloque a função abaixo no arquivo functions.php

function onepage_navmenu($menu_name){

    $locations = get_nav_menu_locations();   //print_r($locations);

    if ( isset( $locations[ $menu_name ] ) ) {

        $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );

        $menu_items = wp_get_nav_menu_items($menu->term_id);

        //print_r($menu_items);

        $menu_list = '<ul id="menu-' . $menu_name . '">';

        foreach ( (array) $menu_items as $key => $menu_item ) {
            $title = $menu_item->title;
            $url = basename($menu_item->url);
            $menu_list .= '<li><a href="#' . $url . '">' . $title . '</a></li>';
        }

        $menu_list .= '</ul>';

    } else {
        $menu_list = '<ul><li>Menu "' . $menu_name . '" não definido.</li></ul>';
    }

    echo $menu_list;
}

//Ative o Custom Nav Menus
function register_main_menus() {
    register_nav_menus(
        array(
            'top-menu' => __( 'Menu do Topo' ) //'top-menu' é o 'menu location' e 'Menu do Topo' é o nome do meu menu
        )
    );
};
if (function_exists('register_nav_menus')) add_action( 'init', 'register_main_menus' );

?>

Modo de Usar:

>> Coloque a função abaixo no local onde quer que o menu OnePage apareça:

<?php onepage_navmenu('top-menu') ?>