下面是一个修改菜单元素以添加内容的示例。在此示例中，类别项被扩展为具有动态生成的子菜单，其中该菜单项具有一类showposts-X，其中X是要显示的帖子数：

function menu_show_category_posts( $item_output = \'\', $item = \'\', $depth = \'\', $args = \'\' ) {
    global $post;

    $item_output = icit_add_class_attrib( $item_output, \'depth-\' . ( $depth ? $depth : 1 ) );

    if ( $item->type == \'taxonomy\' && $item->object == \'category\' && is_array( $item->classes ) ) {
        $query = false;
        $showposts = 10;
        $preview = 0;
        $new_html = array( );
        $i = 0;

        foreach( $item->classes as $class ) {
            if ( preg_match( \'/^showposts-?(\\d*)/\', $class, $matches ) ) {
                $query = true;
                $showposts = ! empty( $matches[ 1 ] ) && intval( $matches[ 1 ] ) ? intval( $matches[ 1 ] ) : 10;
            }
        }

        if ( $query ) {
            $the_posts = get_posts( array(
                             \'category\' => $item->object_id,
                             \'numberposts\' => $showposts
                            ) );

            if ( ! empty( $the_posts ) ) {
                $new_html[] = \'<ul class="sub-menu">\';

                foreach( ( array ) $the_posts as $post ) {
                    setup_postdata( $post );
                    $new_html[] = \'<li class="">\';
                    $new_html[] = the_title( \'<a href="\' . get_permalink( ) . \'" class="depth-\' . ( $depth ? $depth + 1 : 2 ) . \'">\', \'</a>\', false );
                    $new_html[] = \'</li>\';
                }

                $new_html[] = \'</ul>\';
                $item_output .= implode( "\\n", $new_html );
            }
        }
    }

    return $item_output;
}

add_filter( \'walker_nav_menu_start_el\', \'menu_show_media_post\', 10, 4 );