generate a dynamic sitemap from wordpress emnus

sitemap.php

<?php

class av_sitemap{
	private $args;
	public $transient_id;
	public $transient_data;
	function __construct( $args ){
		$this->args = wp_parse_args( $args, array(
			'main_menu' => 'principal',
			'skip' => null,
			'depth' => 0,
			'walker' => new Sitemap_Menu_Walker(),
			'container' => 'div',
			'container_class' => 'sitemap',
			'container_id' => 'sitemap',
			'menu_class' => 'sitemap-menu',
			'menu_id' => 'sitemap-menu-id',
			'cache' => 0,
			'echo' => 1
		) );
		if ( $this->args['cache'] ) $this->transient_id = md5( $this->args['main_menu'] . $this->args['skip'] );
	}
	private function get_transient( ){
		if ( $this->transient_data ) {
			return $this->transient_data;
		} else {
			$data = get_transient($this->transient_id);
			if ( $data ) {
				$this->transient_data = $data;
				return $data;
			} else {
				return false;
			}
		}
		return false;
	}
	public function show( ){
		if ( $this->args['cache'] && $this->get_transient() && !isset($_GET['nocache']) ) {
			echo $this->transient_data;
			return true;
		} else {
			$this->build();
			$out = $this->walk_menus();
			if ( (int)$this->args['cache'] > 0 && !isset($_GET['nocache']) ) set_transient( $this->transient_id , $out, 60 * 60 * (int)$this->args['cache'] );
			if ( $this->args['echo'] ) echo $out;
			else return $out;
		}
		return false;
	}
	private function order_items( $a, $b ){
		if ( $a->menu_order === $b->menu_order) return 0;
		if ( $a->menu_order > $b->menu_order ) return 1;
		else return -1;
	}
	private function walk_menus(){
		$out = '';
		// temporarily override echo, so the loop won't echo before it's time
		$echo = $this->args['echo'];
		$this->args['echo'] = 0;
		foreach ( $this->menus as $menu ) {
			$nav_menu = '';

			// get menu items... we have already retrieved and filtered them
			$sorted_menu_items = $this->menus_items[$menu->term_id];

			// sort items based on "menu_order"
			usort( $sorted_menu_items, array($this, 'order_items') );

			// do container
			if ( $args->container ) {
				$allowed_tags = apply_filters( 'wp_nav_menu_container_allowedtags', array( 'div', 'nav' ) );
				if ( in_array( $args->container, $allowed_tags ) ) {
					$show_container = true;
					$class = $args->container_class ? ' class="' . esc_attr( $args->container_class ) . '"' : ' class="menu-'. $menu->slug .'-container"';
					$id = $args->container_id ? ' id="' . esc_attr( $args->container_id ) . '"' : '';
					$nav_menu .= '<'. $args->container . $id . $class . '>';
				}
			}

			// walk through the items to get them as HTML
			$items = walk_nav_menu_tree( $sorted_menu_items, $this->args['depth'], (object)$this->args );
			unset( $sorted_menu_items );
			$nav_menu .= '<ul class="'. esc_attr($this->args['menu_class']) .'" id="'. esc_attr($menu->slug.'-sitemap') .'">'. $items .'</ul>';
			$nav_menu .= '</' . $args->container . '>';
			$out .= $nav_menu;
			unset($items);
		}
		$this->args['echo'] = $echo;
		return $out;
	}
	private function build(){
		$this->get_menus();
		$this->filter_menus();
		$this->get_all_items();
		$this->blend_items();
	}
	private function filter_menus(){
		if ( !empty( $this->args['skip'] ) ) {
			if ( is_string( $this->args['skip'] ) ) {
				$skip_id = array_search( $this->args['skip'], $this->ids_to_slugs );
				unset( $this->menus[$skip_id] );
			} else {
				// if it's not a string, assume it's an array
				foreach ( $ths->menus as $id => $menu ) if ( in_array($menu->slug, $this->args['skip']) ) unset( $this->menus[$id]);
			}
		}
	}
	private function get_menus(){
		$_menus = wp_get_nav_menus();
		$this->menus = $this->ids_to_slugs = array();
		foreach($_menus as $menu ) {
			$this->menus[$menu->term_id] = $menu;
			$this->ids_to_slugs[$menu->term_id] = $menu->slug;
		}
		unset($_menus);
		$this->main_menu_id = array_search($this->args['main_menu'], $this->ids_to_slugs);
	}
	private function get_all_items(){
		// get all items
		$this->menus_items = array();
		foreach ( $this->menus as $menu ) $this->menus_items[$menu->term_id] = wp_get_nav_menu_items( $menu->term_id );
	}
	private function blend_items(){
		/**
		 * go through the main menu and check if the elements are navigation menus
		 * if so, merge the items from that menu into the main menu
		 **/
		if ( isset($this->args['main_menu']) && !empty($this->main_menu_id) && !empty($this->menus_items[$this->main_menu_id]) ) {
			foreach ( $this->menus_items[$this->main_menu_id] as $k => $item ) {
				if ( $item->object === 'nav_menu' && !empty($this->menus_items[$item->object_id]) ) {
					// go through the (sub)menu items; if it's a first-level element, we'll change that
					// to get it into the main menu hierarchy
					foreach ( $this->menus_items[$item->object_id] as $subitem) {
						if ( $subitem->menu_item_parent == '0' ) {
							$subitem->menu_item_parent = $item->menu_item_parent;
						}
					}
					$this->menus_items[$this->main_menu_id] = array_merge( $this->menus_items[$this->main_menu_id], $this->menus_items[$item->object_id] );
					// unset the menu, so we don't show it twice
					unset( $this->menus_items[$item->object_id], $this->menus[$item->object_id] );
				}
			}
			$this->menus_items[$this->main_menu_id] = array_filter( $this->menus_items[$this->main_menu_id], array($this, 'array_filter'));
		}
	}
	private function array_filter( $item ){
		if ( $item->object === 'nav_menu' ) return false;
		else return true;
	}
}

 ?>