WordPressを読む　70 /blog/wp-includes/nav-menu-template.php

2014/12/04

<?php
/**
 * Navigation Menu template functions
 *
 * @package WordPress
 * @subpackage Nav_Menus
 * @since 3.0.0
 */

/**
 * Create HTML list of nav menu items.
 *
 * @since 3.0.0
 * @uses Walker
 */
class Walker_Nav_Menu extends Walker {
	/**
	 * What the class handles.
	 *
	 * @see Walker::$tree_type
	 * @since 3.0.0
	 * @var string
	 */
	public $tree_type = array( 'post_type', 'taxonomy', 'custom' );

	/**
	 * Database fields to use.
	 *
	 * @see Walker::$db_fields
	 * @since 3.0.0
	 * @todo Decouple this.
	 * @var array
	 */
	public $db_fields = array( 'parent' => 'menu_item_parent', 'id' => 'db_id' );

	/**
	 * Starts the list before the elements are added.
	 *
	 * @see Walker::start_lvl()
	 *
	 * @since 3.0.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int    $depth  Depth of menu item. Used for padding.
	 * @param array  $args   An array of arguments. @see wp_nav_menu()
	 */
	public function start_lvl( &$output, $depth = 0, $args = array() ) {
		$indent = str_repeat("\t", $depth);
		$output .= "\n$indent<ul class=\"sub-menu\">\n";
	}

	/**
	 * Ends the list of after the elements are added.
	 *
	 * @see Walker::end_lvl()
	 *
	 * @since 3.0.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int    $depth  Depth of menu item. Used for padding.
	 * @param array  $args   An array of arguments. @see wp_nav_menu()
	 */
	public function end_lvl( &$output, $depth = 0, $args = array() ) {
		$indent = str_repeat("\t", $depth);
		$output .= "$indent</ul>\n";
	}

	/**
	 * Start the element output.
	 *
	 * @see Walker::start_el()
	 *
	 * @since 3.0.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $item   Menu item data object.
	 * @param int    $depth  Depth of menu item. Used for padding.
	 * @param array  $args   An array of arguments. @see wp_nav_menu()
	 * @param int    $id     Current item ID.
	 */
	public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

		$classes = empty( $item->classes ) ? array() : (array) $item->classes;
		$classes[] = 'menu-item-' . $item->ID;

		/**
		 * Filter the CSS class(es) applied to a menu item's <li>.
		 *
		 * @since 3.0.0
		 *
		 * @see wp_nav_menu()
		 *
		 * @param array  $classes The CSS classes that are applied to the menu item's <li>.
		 * @param object $item    The current menu item.
		 * @param array  $args    An array of wp_nav_menu() arguments.
		 */
		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

		/**
		 * Filter the ID applied to a menu item's <li>.
		 *
		 * @since 3.0.1
		 *
		 * @see wp_nav_menu()
		 *
		 * @param string $menu_id The ID that is applied to the menu item's <li>.
		 * @param object $item    The current menu item.
		 * @param array  $args    An array of wp_nav_menu() arguments.
		 */
		$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
		$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

		$output .= $indent . '<li' . $id . $class_names .'>';

		$atts = array();
		$atts['title']  = ! empty( $item->attr_title ) ? $item->attr_title : '';
		$atts['target'] = ! empty( $item->target )     ? $item->target     : '';
		$atts['rel']    = ! empty( $item->xfn )        ? $item->xfn        : '';
		$atts['href']   = ! empty( $item->url )        ? $item->url        : '';

		/**
		 * Filter the HTML attributes applied to a menu item's <a>.
		 *
		 * @since 3.6.0
		 *
		 * @see wp_nav_menu()
		 *
		 * @param array $atts {
		 *     The HTML attributes applied to the menu item's <a>, empty strings are ignored.
		 *
		 *     @type string $title  Title attribute.
		 *     @type string $target Target attribute.
		 *     @type string $rel    The rel attribute.
		 *     @type string $href   The href attribute.
		 * }
		 * @param object $item The current menu item.
		 * @param array  $args An array of wp_nav_menu() arguments.
		 */
		$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );

		$attributes = '';
		foreach ( $atts as $attr => $value ) {
			if ( ! empty( $value ) ) {
				$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
				$attributes .= ' ' . $attr . '="' . $value . '"';
			}
		}

		$item_output = $args->before;
		$item_output .= '<a'. $attributes .'>';
		/** This filter is documented in wp-includes/post-template.php */
		$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
		$item_output .= '</a>';
		$item_output .= $args->after;

		/**
		 * Filter a menu item's starting output.
		 *
		 * The menu item's starting output only includes $args->before, the opening <a>,
		 * the menu item's title, the closing </a>, and $args->after. Currently, there is
		 * no filter for modifying the opening and closing <li> for a menu item.
		 *
		 * @since 3.0.0
		 *
		 * @see wp_nav_menu()
		 *
		 * @param string $item_output The menu item's starting HTML output.
		 * @param object $item        Menu item data object.
		 * @param int    $depth       Depth of menu item. Used for padding.
		 * @param array  $args        An array of wp_nav_menu() arguments.
		 */
		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
	}

	/**
	 * Ends the element output, if needed.
	 *
	 * @see Walker::end_el()
	 *
	 * @since 3.0.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $item   Page data object. Not used.
	 * @param int    $depth  Depth of page. Not Used.
	 * @param array  $args   An array of arguments. @see wp_nav_menu()
	 */
	public function end_el( &$output, $item, $depth = 0, $args = array() ) {
		$output .= "</li>\n";
	}

} // Walker_Nav_Menu

/**
 * Displays a navigation menu.
 *
 * @since 3.0.0
 *
 * @param array $args {
 *     Optional. Array of nav menu arguments.
 *
 *     @type string        $menu            Desired menu. Accepts (matching in order) id, slug, name. Default empty.
 *     @type string        $menu_class      CSS class to use for the ul element which forms the menu. Default 'menu'.
 *     @type string        $menu_id         The ID that is applied to the ul element which forms the menu.
 *                                          Default is the menu slug, incremented.
 *     @type string        $container       Whether to wrap the ul, and what to wrap it with. Default 'div'.
 *     @type string        $container_class Class that is applied to the container. Default 'menu-{menu slug}-container'.
 *     @type string        $container_id    The ID that is applied to the container. Default empty.
 *     @type callback|bool $fallback_cb     If the menu doesn't exists, a callback function will fire.
 *                                          Default is 'wp_page_menu'. Set to false for no fallback.
 *     @type string        $before          Text before the link text. Default empty.
 *     @type string        $after           Text after the link text. Default empty.
 *     @type string        $link_before     Text before the link. Default empty.
 *     @type string        $link_after      Text after the link. Default empty.
 *     @type bool          $echo            Whether to echo the menu or return it. Default true.
 *     @type int           $depth           How many levels of the hierarchy are to be included. 0 means all. Default 0.
 *     @type object        $walker          Instance of a custom walker class. Default empty.
 *     @type string        $theme_location  Theme location to be used. Must be registered with register_nav_menu()
 *                                          in order to be selectable by the user.
 *     @type string        $items_wrap      How the list items should be wrapped. Default is a ul with an id and class.
 *                                          Uses printf() format with numbered placeholders.
 * }
 * @return mixed Menu output if $echo is false, false if there are no items or no menu was found.
 */
function wp_nav_menu( $args = array() ) {
	static $menu_id_slugs = array();

	$defaults = array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 'menu_id' => '',
	'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'items_wrap' => '<ul id="%1$s" class="%2$s">%3$s</ul>',
	'depth' => 0, 'walker' => '', 'theme_location' => '' );

	$args = wp_parse_args( $args, $defaults );
	/**
	 * Filter the arguments used to display a navigation menu.
	 *
	 * @since 3.0.0
	 *
	 * @see wp_nav_menu()
	 *
	 * @param array $args Array of wp_nav_menu() arguments.
	 */
	$args = apply_filters( 'wp_nav_menu_args', $args );
	$args = (object) $args;

	/**
	 * Filter whether to short-circuit the wp_nav_menu() output.
	 *
	 * Returning a non-null value to the filter will short-circuit
	 * wp_nav_menu(), echoing that value if $args->echo is true,
	 * returning that value otherwise.
	 *
	 * @since 3.9.0
	 *
	 * @see wp_nav_menu()
	 *
	 * @param string|null $output Nav menu output to short-circuit with. Default null.
	 * @param object      $args   An object containing wp_nav_menu() arguments.
	 */
	$nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args );

	if ( null !== $nav_menu ) {
		if ( $args->echo ) {
			echo $nav_menu;
			return;
		}

		return $nav_menu;
	}

	// Get the nav menu based on the requested menu
	$menu = wp_get_nav_menu_object( $args->menu );

	// Get the nav menu based on the theme_location
	if ( ! $menu && $args->theme_location && ( $locations = get_nav_menu_locations() ) && isset( $locations[ $args->theme_location ] ) )
		$menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );

	// get the first menu that has items if we still can't find a menu
	if ( ! $menu && !$args->theme_location ) {
		$menus = wp_get_nav_menus( array( 'orderby' => 'name' ) );
		foreach ( $menus as $menu_maybe ) {
			if ( $menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) ) ) {
				$menu = $menu_maybe;
				break;
			}
		}
	}

	// If the menu exists, get its items.
	if ( $menu && ! is_wp_error($menu) && !isset($menu_items) )
		$menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );

	/*
	 * If no menu was found:
	 *  - Fall back (if one was specified), or bail.
	 *
	 * If no menu items were found:
	 *  - Fall back, but only if no theme location was specified.
	 *  - Otherwise, bail.
	 */
	if ( ( !$menu || is_wp_error($menu) || ( isset($menu_items) && empty($menu_items) && !$args->theme_location ) )
		&& $args->fallback_cb && is_callable( $args->fallback_cb ) )
			return call_user_func( $args->fallback_cb, (array) $args );

	if ( ! $menu || is_wp_error( $menu ) )
		return false;

	$nav_menu = $items = '';

	$show_container = false;
	if ( $args->container ) {
		/**
		 * Filter the list of HTML tags that are valid for use as menu containers.
		 *
		 * @since 3.0.0
		 *
		 * @param array $tags The acceptable HTML tags for use as menu containers.
		 *                    Default is array containing 'div' and 'nav'.
		 */
		$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 . '>';
		}
	}

	// Set up the $menu_item variables
	_wp_menu_item_classes_by_context( $menu_items );

	$sorted_menu_items = $menu_items_with_children = array();
	foreach ( (array) $menu_items as $menu_item ) {
		$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;
		if ( $menu_item->menu_item_parent )
			$menu_items_with_children[ $menu_item->menu_item_parent ] = true;
	}

	// Add the menu-item-has-children class where applicable
	if ( $menu_items_with_children ) {
		foreach ( $sorted_menu_items as &$menu_item ) {
			if ( isset( $menu_items_with_children[ $menu_item->ID ] ) )
				$menu_item->classes[] = 'menu-item-has-children';
		}
	}

	unset( $menu_items, $menu_item );

	/**
	 * Filter the sorted list of menu item objects before generating the menu's HTML.
	 *
	 * @since 3.1.0
	 *
	 * @param array  $sorted_menu_items The menu items, sorted by each menu item's menu order.
	 * @param object $args              An object containing wp_nav_menu() arguments.
	 */
	$sorted_menu_items = apply_filters( 'wp_nav_menu_objects', $sorted_menu_items, $args );

	$items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, $args );
	unset($sorted_menu_items);

	// Attributes
	if ( ! empty( $args->menu_id ) ) {
		$wrap_id = $args->menu_id;
	} else {
		$wrap_id = 'menu-' . $menu->slug;
		while ( in_array( $wrap_id, $menu_id_slugs ) ) {
			if ( preg_match( '#-(\d+)$#', $wrap_id, $matches ) )
				$wrap_id = preg_replace('#-(\d+)$#', '-' . ++$matches[1], $wrap_id );
			else
				$wrap_id = $wrap_id . '-1';
		}
	}
	$menu_id_slugs[] = $wrap_id;

	$wrap_class = $args->menu_class ? $args->menu_class : '';

	/**
	 * Filter the HTML list content for navigation menus.
	 *
	 * @since 3.0.0
	 *
	 * @see wp_nav_menu()
	 *
	 * @param string $items The HTML list content for the menu items.
	 * @param object $args  An object containing wp_nav_menu() arguments.
	 */
	$items = apply_filters( 'wp_nav_menu_items', $items, $args );
	/**
	 * Filter the HTML list content for a specific navigation menu.
	 *
	 * @since 3.0.0
	 *
	 * @see wp_nav_menu()
	 *
	 * @param string $items The HTML list content for the menu items.
	 * @param object $args  An object containing wp_nav_menu() arguments.
	 */
	$items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args );

	// Don't print any markup if there are no items at this point.
	if ( empty( $items ) )
		return false;

	$nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items );
	unset( $items );

	if ( $show_container )
		$nav_menu .= '</' . $args->container . '>';

	/**
	 * Filter the HTML content for navigation menus.
	 *
	 * @since 3.0.0
	 *
	 * @see wp_nav_menu()
	 *
	 * @param string $nav_menu The HTML content for the navigation menu.
	 * @param object $args     An object containing wp_nav_menu() arguments.
	 */
	$nav_menu = apply_filters( 'wp_nav_menu', $nav_menu, $args );

	if ( $args->echo )
		echo $nav_menu;
	else
		return $nav_menu;
}

/**
 * Add the class property classes for the current context, if applicable.
 *
 * @access private
 * @since 3.0.0
 *
 * @param array $menu_items The current menu item objects to which to add the class property information.
 */
function _wp_menu_item_classes_by_context( &$menu_items ) {
	global $wp_query, $wp_rewrite;

	$queried_object = $wp_query->get_queried_object();
	$queried_object_id = (int) $wp_query->queried_object_id;

	$active_object = '';
	$active_ancestor_item_ids = array();
	$active_parent_item_ids = array();
	$active_parent_object_ids = array();
	$possible_taxonomy_ancestors = array();
	$possible_object_parents = array();
	$home_page_id = (int) get_option( 'page_for_posts' );

	if ( $wp_query->is_singular && ! empty( $queried_object->post_type ) && ! is_post_type_hierarchical( $queried_object->post_type ) ) {
		foreach ( (array) get_object_taxonomies( $queried_object->post_type ) as $taxonomy ) {
			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
				$term_hierarchy = _get_term_hierarchy( $taxonomy );
				$terms = wp_get_object_terms( $queried_object_id, $taxonomy, array( 'fields' => 'ids' ) );
				if ( is_array( $terms ) ) {
					$possible_object_parents = array_merge( $possible_object_parents, $terms );
					$term_to_ancestor = array();
					foreach ( (array) $term_hierarchy as $anc => $descs ) {
						foreach ( (array) $descs as $desc )
							$term_to_ancestor[ $desc ] = $anc;
					}

					foreach ( $terms as $desc ) {
						do {
							$possible_taxonomy_ancestors[ $taxonomy ][] = $desc;
							if ( isset( $term_to_ancestor[ $desc ] ) ) {
								$_desc = $term_to_ancestor[ $desc ];
								unset( $term_to_ancestor[ $desc ] );
								$desc = $_desc;
							} else {
								$desc = 0;
							}
						} while ( ! empty( $desc ) );
					}
				}
			}
		}
	} elseif ( ! empty( $queried_object->taxonomy ) && is_taxonomy_hierarchical( $queried_object->taxonomy ) ) {
		$term_hierarchy = _get_term_hierarchy( $queried_object->taxonomy );
		$term_to_ancestor = array();
		foreach ( (array) $term_hierarchy as $anc => $descs ) {
			foreach ( (array) $descs as $desc )
				$term_to_ancestor[ $desc ] = $anc;
		}
		$desc = $queried_object->term_id;
		do {
			$possible_taxonomy_ancestors[ $queried_object->taxonomy ][] = $desc;
			if ( isset( $term_to_ancestor[ $desc ] ) ) {
				$_desc = $term_to_ancestor[ $desc ];
				unset( $term_to_ancestor[ $desc ] );
				$desc = $_desc;
			} else {
				$desc = 0;
			}
		} while ( ! empty( $desc ) );
	}

	$possible_object_parents = array_filter( $possible_object_parents );

	$front_page_url = home_url();

	foreach ( (array) $menu_items as $key => $menu_item ) {

		$menu_items[$key]->current = false;

		$classes = (array) $menu_item->classes;
		$classes[] = 'menu-item';
		$classes[] = 'menu-item-type-' . $menu_item->type;
		$classes[] = 'menu-item-object-' . $menu_item->object;

		// if the menu item corresponds to a taxonomy term for the currently-queried non-hierarchical post object
		if ( $wp_query->is_singular && 'taxonomy' == $menu_item->type && in_array( $menu_item->object_id, $possible_object_parents ) ) {
			$active_parent_object_ids[] = (int) $menu_item->object_id;
			$active_parent_item_ids[] = (int) $menu_item->db_id;
			$active_object = $queried_object->post_type;

		// if the menu item corresponds to the currently-queried post or taxonomy object
		} elseif (
			$menu_item->object_id == $queried_object_id &&
			(
				( ! empty( $home_page_id ) && 'post_type' == $menu_item->type && $wp_query->is_home && $home_page_id == $menu_item->object_id ) ||
				( 'post_type' == $menu_item->type && $wp_query->is_singular ) ||
				( 'taxonomy' == $menu_item->type && ( $wp_query->is_category || $wp_query->is_tag || $wp_query->is_tax ) && $queried_object->taxonomy == $menu_item->object )
			)
		) {
			$classes[] = 'current-menu-item';
			$menu_items[$key]->current = true;
			$_anc_id = (int) $menu_item->db_id;

			while(
				( $_anc_id = get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) ) &&
				! in_array( $_anc_id, $active_ancestor_item_ids )
			) {
				$active_ancestor_item_ids[] = $_anc_id;
			}

			if ( 'post_type' == $menu_item->type && 'page' == $menu_item->object ) {
				// Back compat classes for pages to match wp_page_menu()
				$classes[] = 'page_item';
				$classes[] = 'page-item-' . $menu_item->object_id;
				$classes[] = 'current_page_item';
			}
			$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;
			$active_parent_object_ids[] = (int) $menu_item->post_parent;
			$active_object = $menu_item->object;

		// if the menu item corresponds to the currently-requested URL
		} elseif ( 'custom' == $menu_item->object ) {
			$_root_relative_current = untrailingslashit( $_SERVER['REQUEST_URI'] );
			$current_url = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_root_relative_current );
			$raw_item_url = strpos( $menu_item->url, '#' ) ? substr( $menu_item->url, 0, strpos( $menu_item->url, '#' ) ) : $menu_item->url;
			$item_url = untrailingslashit( $raw_item_url );
			$_indexless_current = untrailingslashit( preg_replace( '/' . preg_quote( $wp_rewrite->index, '/' ) . '$/', '', $current_url ) );

			if ( $raw_item_url && in_array( $item_url, array( $current_url, $_indexless_current, $_root_relative_current ) ) ) {
				$classes[] = 'current-menu-item';
				$menu_items[$key]->current = true;
				$_anc_id = (int) $menu_item->db_id;

				while(
					( $_anc_id = get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) ) &&
					! in_array( $_anc_id, $active_ancestor_item_ids )
				) {
					$active_ancestor_item_ids[] = $_anc_id;
				}

				if ( in_array( home_url(), array( untrailingslashit( $current_url ), untrailingslashit( $_indexless_current ) ) ) ) {
					// Back compat for home link to match wp_page_menu()
					$classes[] = 'current_page_item';
				}
				$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;
				$active_parent_object_ids[] = (int) $menu_item->post_parent;
				$active_object = $menu_item->object;

			// give front page item current-menu-item class when extra query arguments involved
			} elseif ( $item_url == $front_page_url && is_front_page() ) {
				$classes[] = 'current-menu-item';
			}

			if ( untrailingslashit($item_url) == home_url() )
				$classes[] = 'menu-item-home';
		}

		// back-compat with wp_page_menu: add "current_page_parent" to static home page link for any non-page query
		if ( ! empty( $home_page_id ) && 'post_type' == $menu_item->type && empty( $wp_query->is_page ) && $home_page_id == $menu_item->object_id )
			$classes[] = 'current_page_parent';

		$menu_items[$key]->classes = array_unique( $classes );
	}
	$active_ancestor_item_ids = array_filter( array_unique( $active_ancestor_item_ids ) );
	$active_parent_item_ids = array_filter( array_unique( $active_parent_item_ids ) );
	$active_parent_object_ids = array_filter( array_unique( $active_parent_object_ids ) );

	// set parent's class
	foreach ( (array) $menu_items as $key => $parent_item ) {
		$classes = (array) $parent_item->classes;
		$menu_items[$key]->current_item_ancestor = false;
		$menu_items[$key]->current_item_parent = false;

		if (
			isset( $parent_item->type ) &&
			(
				// ancestral post object
				(
					'post_type' == $parent_item->type &&
					! empty( $queried_object->post_type ) &&
					is_post_type_hierarchical( $queried_object->post_type ) &&
					in_array( $parent_item->object_id, $queried_object->ancestors ) &&
					$parent_item->object != $queried_object->ID
				) ||

				// ancestral term
				(
					'taxonomy' == $parent_item->type &&
					isset( $possible_taxonomy_ancestors[ $parent_item->object ] ) &&
					in_array( $parent_item->object_id, $possible_taxonomy_ancestors[ $parent_item->object ] ) &&
					(
						! isset( $queried_object->term_id ) ||
						$parent_item->object_id != $queried_object->term_id
					)
				)
			)
		) {
			$classes[] = empty( $queried_object->taxonomy ) ? 'current-' . $queried_object->post_type . '-ancestor' : 'current-' . $queried_object->taxonomy . '-ancestor';
		}

		if ( in_array(  intval( $parent_item->db_id ), $active_ancestor_item_ids ) ) {
			$classes[] = 'current-menu-ancestor';
			$menu_items[$key]->current_item_ancestor = true;
		}
		if ( in_array( $parent_item->db_id, $active_parent_item_ids ) ) {
			$classes[] = 'current-menu-parent';
			$menu_items[$key]->current_item_parent = true;
		}
		if ( in_array( $parent_item->object_id, $active_parent_object_ids ) )
			$classes[] = 'current-' . $active_object . '-parent';

		if ( 'post_type' == $parent_item->type && 'page' == $parent_item->object ) {
			// Back compat classes for pages to match wp_page_menu()
			if ( in_array('current-menu-parent', $classes) )
				$classes[] = 'current_page_parent';
			if ( in_array('current-menu-ancestor', $classes) )
				$classes[] = 'current_page_ancestor';
		}

		$menu_items[$key]->classes = array_unique( $classes );
	}
}

/**
 * Retrieve the HTML list content for nav menu items.
 *
 * @uses Walker_Nav_Menu to create HTML list content.
 * @since 3.0.0
 * @see Walker::walk() for parameters and return description.
 */
function walk_nav_menu_tree( $items, $depth, $r ) {
	$walker = ( empty($r->walker) ) ? new Walker_Nav_Menu : $r->walker;
	$args = array( $items, $depth, $r );

	return call_user_func_array( array($walker, 'walk'), $args );
}

/**
 * Prevents a menu item ID from being used more than once.
 *
 * @since 3.0.1
 * @access private
 */
function _nav_menu_item_id_use_once( $id, $item ) {
	static $_used_ids = array();
	if ( in_array( $item->ID, $_used_ids ) )
		return '';
	$_used_ids[] = $item->ID;
	return $id;
}
add_filter( 'nav_menu_item_id', '_nav_menu_item_id_use_once', 10, 2 );

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<?php

/**

* Navigation Menu template functions

* @package WordPress

* @subpackage Nav_Menus

* @since 3.0.0

/**

* Create HTML list of nav menu items.

* @since 3.0.0

* @uses Walker

class Walker_Nav_Menu extends Walker {

/**

* What the class handles.

* @see Walker::$tree_type

* @since 3.0.0

* @var string

public $tree_type = array( 'post_type', 'taxonomy', 'custom' );

/**

* Database fields to use.

* @see Walker::$db_fields

* @since 3.0.0

* @todo Decouple this.

* @var array

public $db_fields = array( 'parent' => 'menu_item_parent', 'id' => 'db_id' );

/**

* Starts the list before the elements are added.

* @see Walker::start_lvl()

* @since 3.0.0

* @param string $output Passed by reference. Used to append additional content.

* @param int $depth Depth of menu item. Used for padding.

* @param array $args An array of arguments. @see wp_nav_menu()

public function start_lvl( &$output, $depth = 0, $args = array() ) {

$indent = str_repeat("\t", $depth);

$output .= "\n$indent<ul class=\"sub-menu\">\n";

}

/**

* Ends the list of after the elements are added.

* @see Walker::end_lvl()

* @since 3.0.0

* @param string $output Passed by reference. Used to append additional content.

* @param int $depth Depth of menu item. Used for padding.

* @param array $args An array of arguments. @see wp_nav_menu()

public function end_lvl( &$output, $depth = 0, $args = array() ) {

$indent = str_repeat("\t", $depth);

$output .= "$indent</ul>\n";

}

/**

* Start the element output.

* @see Walker::start_el()

* @since 3.0.0

* @param string $output Passed by reference. Used to append additional content.

* @param object $item Menu item data object.

* @param int $depth Depth of menu item. Used for padding.

* @param array $args An array of arguments. @see wp_nav_menu()

* @param int $id Current item ID.

public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {

$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

$classes = empty( $item->classes ) ? array() : (array) $item->classes;

$classes[] = 'menu-item-' . $item->ID;

/**

* Filter the CSS class(es) applied to a menu item's <li>.

* @since 3.0.0

* @see wp_nav_menu()

* @param array $classes The CSS classes that are applied to the menu item's <li>.

* @param object $item The current menu item.

* @param array $args An array of wp_nav_menu() arguments.

$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );

$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

/**

* Filter the ID applied to a menu item's <li>.

* @since 3.0.1

* @see wp_nav_menu()

* @param string $menu_id The ID that is applied to the menu item's <li>.

* @param object $item The current menu item.

* @param array $args An array of wp_nav_menu() arguments.

$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );

$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

$output .= $indent . '<li' . $id . $class_names .'>';

$atts = array();

$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';

$atts['target'] = ! empty( $item->target ) ? $item->target : '';

$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';

$atts['href'] = ! empty( $item->url ) ? $item->url : '';

/**

* Filter the HTML attributes applied to a menu item's <a>.

* @since 3.6.0

* @see wp_nav_menu()

* @param array $atts {

* The HTML attributes applied to the menu item's <a>, empty strings are ignored.

* @type string $title Title attribute.

* @type string $target Target attribute.

* @type string $rel The rel attribute.

* @type string $href The href attribute.

* }

* @param object $item The current menu item.

* @param array $args An array of wp_nav_menu() arguments.

$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );

$attributes = '';

foreach ( $atts as $attr => $value ) {

if ( ! empty( $value ) ) {

$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );

$attributes .= ' ' . $attr . '="' . $value . '"';

}

$item_output = $args->before;

$item_output .= '<a'. $attributes .'>';

/** This filter is documented in wp-includes/post-template.php */

$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;

$item_output .= '</a>';

$item_output .= $args->after;

/**

* Filter a menu item's starting output.

* The menu item's starting output only includes $args->before, the opening <a>,

* the menu item's title, the closing </a>, and $args->after. Currently, there is

* no filter for modifying the opening and closing <li> for a menu item.

* @since 3.0.0

* @see wp_nav_menu()

* @param string $item_output The menu item's starting HTML output.

* @param object $item Menu item data object.

* @param int $depth Depth of menu item. Used for padding.

* @param array $args An array of wp_nav_menu() arguments.

$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );

}

/**

* Ends the element output, if needed.

* @see Walker::end_el()

* @since 3.0.0

* @param string $output Passed by reference. Used to append additional content.

* @param object $item Page data object. Not used.

* @param int $depth Depth of page. Not Used.

* @param array $args An array of arguments. @see wp_nav_menu()

public function end_el( &$output, $item, $depth = 0, $args = array() ) {

$output .= "</li>\n";

}

} // Walker_Nav_Menu

/**

* Displays a navigation menu.

* @since 3.0.0

* @param array $args {

* Optional. Array of nav menu arguments.

* @type string $menu Desired menu. Accepts (matching in order) id, slug, name. Default empty.

* @type string $menu_class CSS class to use for the ul element which forms the menu. Default 'menu'.

* @type string $menu_id The ID that is applied to the ul element which forms the menu.

* Default is the menu slug, incremented.

* @type string $container Whether to wrap the ul, and what to wrap it with. Default 'div'.

* @type string $container_class Class that is applied to the container. Default 'menu-{menu slug}-container'.

* @type string $container_id The ID that is applied to the container. Default empty.

* @type callback|bool $fallback_cb If the menu doesn't exists, a callback function will fire.

* Default is 'wp_page_menu'. Set to false for no fallback.

* @type string $before Text before the link text. Default empty.

* @type string $after Text after the link text. Default empty.

* @type string $link_before Text before the link. Default empty.

* @type string $link_after Text after the link. Default empty.

* @type bool $echo Whether to echo the menu or return it. Default true.

* @type int $depth How many levels of the hierarchy are to be included. 0 means all. Default 0.

* @type object $walker Instance of a custom walker class. Default empty.

* @type string $theme_location Theme location to be used. Must be registered with register_nav_menu()

* in order to be selectable by the user.

* @type string $items_wrap How the list items should be wrapped. Default is a ul with an id and class.

* Uses printf() format with numbered placeholders.

* }

* @return mixed Menu output if $echo is false, false if there are no items or no menu was found.

function wp_nav_menu( $args = array() ) {

static $menu_id_slugs = array();

$defaults = array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 'menu_id' => '',

'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'items_wrap' => '<ul id="%1$s" class="%2$s">%3$s</ul>',

'depth' => 0, 'walker' => '', 'theme_location' => '' );

$args = wp_parse_args( $args, $defaults );

/**

* Filter the arguments used to display a navigation menu.

* @since 3.0.0

* @see wp_nav_menu()

* @param array $args Array of wp_nav_menu() arguments.

$args = apply_filters( 'wp_nav_menu_args', $args );

$args = (object) $args;

/**

* Filter whether to short-circuit the wp_nav_menu() output.

* Returning a non-null value to the filter will short-circuit

* wp_nav_menu(), echoing that value if $args->echo is true,

* returning that value otherwise.

* @since 3.9.0

* @see wp_nav_menu()

* @param string|null $output Nav menu output to short-circuit with. Default null.

* @param object $args An object containing wp_nav_menu() arguments.

$nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args );

if ( null !== $nav_menu ) {

if ( $args->echo ) {

echo $nav_menu;

return;

}

return $nav_menu;

}

// Get the nav menu based on the requested menu

$menu = wp_get_nav_menu_object( $args->menu );

// Get the nav menu based on the theme_location

if ( ! $menu && $args->theme_location && ( $locations = get_nav_menu_locations() ) && isset( $locations[ $args->theme_location ] ) )

$menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );

// get the first menu that has items if we still can't find a menu

if ( ! $menu && !$args->theme_location ) {

$menus = wp_get_nav_menus( array( 'orderby' => 'name' ) );

foreach ( $menus as $menu_maybe ) {

if ( $menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) ) ) {

$menu = $menu_maybe;

break;

}

// If the menu exists, get its items.

if ( $menu && ! is_wp_error($menu) && !isset($menu_items) )

$menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );

* If no menu was found:

* - Fall back (if one was specified), or bail.

* If no menu items were found:

* - Fall back, but only if no theme location was specified.

* - Otherwise, bail.

if ( ( !$menu || is_wp_error($menu) || ( isset($menu_items) && empty($menu_items) && !$args->theme_location ) )

&& $args->fallback_cb && is_callable( $args->fallback_cb ) )

return call_user_func( $args->fallback_cb, (array) $args );

if ( ! $menu || is_wp_error( $menu ) )

return false;

$nav_menu = $items = '';

$show_container = false;

if ( $args->container ) {

/**

* Filter the list of HTML tags that are valid for use as menu containers.

* @since 3.0.0

* @param array $tags The acceptable HTML tags for use as menu containers.

* Default is array containing 'div' and 'nav'.

$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 . '>';

}

// Set up the $menu_item variables

_wp_menu_item_classes_by_context( $menu_items );

$sorted_menu_items = $menu_items_with_children = array();

foreach ( (array) $menu_items as $menu_item ) {

$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;

if ( $menu_item->menu_item_parent )

$menu_items_with_children[ $menu_item->menu_item_parent ] = true;

}

// Add the menu-item-has-children class where applicable

if ( $menu_items_with_children ) {

foreach ( $sorted_menu_items as &$menu_item ) {

if ( isset( $menu_items_with_children[ $menu_item->ID ] ) )

$menu_item->classes[] = 'menu-item-has-children';

}

unset( $menu_items, $menu_item );

/**

* Filter the sorted list of menu item objects before generating the menu's HTML.

* @since 3.1.0

* @param array $sorted_menu_items The menu items, sorted by each menu item's menu order.

* @param object $args An object containing wp_nav_menu() arguments.

$sorted_menu_items = apply_filters( 'wp_nav_menu_objects', $sorted_menu_items, $args );

$items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, $args );

unset($sorted_menu_items);

// Attributes

if ( ! empty( $args->menu_id ) ) {

$wrap_id = $args->menu_id;

} else {

$wrap_id = 'menu-' . $menu->slug;

while ( in_array( $wrap_id, $menu_id_slugs ) ) {

if ( preg_match( '#-(\d+)$#', $wrap_id, $matches ) )

$wrap_id = preg_replace('#-(\d+)$#', '-' . ++$matches[1], $wrap_id );

else

$wrap_id = $wrap_id . '-1';

}

$menu_id_slugs[] = $wrap_id;

$wrap_class = $args->menu_class ? $args->menu_class : '';

/**

* Filter the HTML list content for navigation menus.

* @since 3.0.0

* @see wp_nav_menu()

* @param string $items The HTML list content for the menu items.

* @param object $args An object containing wp_nav_menu() arguments.

$items = apply_filters( 'wp_nav_menu_items', $items, $args );

/**

* Filter the HTML list content for a specific navigation menu.

* @since 3.0.0

* @see wp_nav_menu()

* @param string $items The HTML list content for the menu items.

* @param object $args An object containing wp_nav_menu() arguments.

$items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args );

// Don't print any markup if there are no items at this point.

if ( empty( $items ) )

return false;

$nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items );

unset( $items );

if ( $show_container )

$nav_menu .= '</' . $args->container . '>';

/**

* Filter the HTML content for navigation menus.

* @since 3.0.0

* @see wp_nav_menu()

* @param string $nav_menu The HTML content for the navigation menu.

* @param object $args An object containing wp_nav_menu() arguments.

$nav_menu = apply_filters( 'wp_nav_menu', $nav_menu, $args );

if ( $args->echo )

echo $nav_menu;

else

return $nav_menu;

}

/**

* Add the class property classes for the current context, if applicable.

* @access private

* @since 3.0.0

* @param array $menu_items The current menu item objects to which to add the class property information.

function _wp_menu_item_classes_by_context( &$menu_items ) {

global $wp_query, $wp_rewrite;

$queried_object = $wp_query->get_queried_object();

$queried_object_id = (int) $wp_query->queried_object_id;

$active_object = '';

$active_ancestor_item_ids = array();

$active_parent_item_ids = array();

$active_parent_object_ids = array();

$possible_taxonomy_ancestors = array();

$possible_object_parents = array();

$home_page_id = (int) get_option( 'page_for_posts' );

if ( $wp_query->is_singular && ! empty( $queried_object->post_type ) && ! is_post_type_hierarchical( $queried_object->post_type ) ) {

foreach ( (array) get_object_taxonomies( $queried_object->post_type ) as $taxonomy ) {

if ( is_taxonomy_hierarchical( $taxonomy ) ) {

$term_hierarchy = _get_term_hierarchy( $taxonomy );

$terms = wp_get_object_terms( $queried_object_id, $taxonomy, array( 'fields' => 'ids' ) );

if ( is_array( $terms ) ) {

$possible_object_parents = array_merge( $possible_object_parents, $terms );

$term_to_ancestor = array();

foreach ( (array) $term_hierarchy as $anc => $descs ) {

foreach ( (array) $descs as $desc )

$term_to_ancestor[ $desc ] = $anc;

}

foreach ( $terms as $desc ) {

do {

$possible_taxonomy_ancestors[ $taxonomy ][] = $desc;

if ( isset( $term_to_ancestor[ $desc ] ) ) {

$_desc = $term_to_ancestor[ $desc ];

unset( $term_to_ancestor[ $desc ] );

$desc = $_desc;

} else {

$desc = 0;

}

} while ( ! empty( $desc ) );

}

} elseif ( ! empty( $queried_object->taxonomy ) && is_taxonomy_hierarchical( $queried_object->taxonomy ) ) {

$term_hierarchy = _get_term_hierarchy( $queried_object->taxonomy );

$term_to_ancestor = array();

foreach ( (array) $term_hierarchy as $anc => $descs ) {

foreach ( (array) $descs as $desc )

$term_to_ancestor[ $desc ] = $anc;

}

$desc = $queried_object->term_id;

do {

$possible_taxonomy_ancestors[ $queried_object->taxonomy ][] = $desc;

if ( isset( $term_to_ancestor[ $desc ] ) ) {

$_desc = $term_to_ancestor[ $desc ];

unset( $term_to_ancestor[ $desc ] );

$desc = $_desc;

} else {

$desc = 0;

}

} while ( ! empty( $desc ) );

}

$possible_object_parents = array_filter( $possible_object_parents );

$front_page_url = home_url();

foreach ( (array) $menu_items as $key => $menu_item ) {

$menu_items[$key]->current = false;

$classes = (array) $menu_item->classes;

$classes[] = 'menu-item';

$classes[] = 'menu-item-type-' . $menu_item->type;

$classes[] = 'menu-item-object-' . $menu_item->object;

// if the menu item corresponds to a taxonomy term for the currently-queried non-hierarchical post object

if ( $wp_query->is_singular && 'taxonomy' == $menu_item->type && in_array( $menu_item->object_id, $possible_object_parents ) ) {

$active_parent_object_ids[] = (int) $menu_item->object_id;

$active_parent_item_ids[] = (int) $menu_item->db_id;

$active_object = $queried_object->post_type;

// if the menu item corresponds to the currently-queried post or taxonomy object

} elseif (

$menu_item->object_id == $queried_object_id &&

(

( ! empty( $home_page_id ) && 'post_type' == $menu_item->type && $wp_query->is_home && $home_page_id == $menu_item->object_id ) ||

( 'post_type' == $menu_item->type && $wp_query->is_singular ) ||

( 'taxonomy' == $menu_item->type && ( $wp_query->is_category || $wp_query->is_tag || $wp_query->is_tax ) && $queried_object->taxonomy == $menu_item->object )

)

) {

$classes[] = 'current-menu-item';

$menu_items[$key]->current = true;

$_anc_id = (int) $menu_item->db_id;

while(

( $_anc_id = get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) ) &&

! in_array( $_anc_id, $active_ancestor_item_ids )

) {

$active_ancestor_item_ids[] = $_anc_id;

}

if ( 'post_type' == $menu_item->type && 'page' == $menu_item->object ) {

// Back compat classes for pages to match wp_page_menu()

$classes[] = 'page_item';

$classes[] = 'page-item-' . $menu_item->object_id;

$classes[] = 'current_page_item';

}

$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;

$active_parent_object_ids[] = (int) $menu_item->post_parent;

$active_object = $menu_item->object;

// if the menu item corresponds to the currently-requested URL

} elseif ( 'custom' == $menu_item->object ) {

$_root_relative_current = untrailingslashit( $_SERVER['REQUEST_URI'] );

$current_url = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_root_relative_current );

$raw_item_url = strpos( $menu_item->url, '#' ) ? substr( $menu_item->url, 0, strpos( $menu_item->url, '#' ) ) : $menu_item->url;

$item_url = untrailingslashit( $raw_item_url );

$_indexless_current = untrailingslashit( preg_replace( '/' . preg_quote( $wp_rewrite->index, '/' ) . '$/', '', $current_url ) );

if ( $raw_item_url && in_array( $item_url, array( $current_url, $_indexless_current, $_root_relative_current ) ) ) {

$classes[] = 'current-menu-item';

$menu_items[$key]->current = true;

$_anc_id = (int) $menu_item->db_id;

while(

( $_anc_id = get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) ) &&

! in_array( $_anc_id, $active_ancestor_item_ids )

) {

$active_ancestor_item_ids[] = $_anc_id;

}

if ( in_array( home_url(), array( untrailingslashit( $current_url ), untrailingslashit( $_indexless_current ) ) ) ) {

// Back compat for home link to match wp_page_menu()

$classes[] = 'current_page_item';

}

$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;

$active_parent_object_ids[] = (int) $menu_item->post_parent;

$active_object = $menu_item->object;

// give front page item current-menu-item class when extra query arguments involved

} elseif ( $item_url == $front_page_url && is_front_page() ) {

$classes[] = 'current-menu-item';

}

if ( untrailingslashit($item_url) == home_url() )

$classes[] = 'menu-item-home';

}

// back-compat with wp_page_menu: add "current_page_parent" to static home page link for any non-page query

if ( ! empty( $home_page_id ) && 'post_type' == $menu_item->type && empty( $wp_query->is_page ) && $home_page_id == $menu_item->object_id )

$classes[] = 'current_page_parent';

$menu_items[$key]->classes = array_unique( $classes );

}

$active_ancestor_item_ids = array_filter( array_unique( $active_ancestor_item_ids ) );

$active_parent_item_ids = array_filter( array_unique( $active_parent_item_ids ) );

$active_parent_object_ids = array_filter( array_unique( $active_parent_object_ids ) );

// set parent's class

foreach ( (array) $menu_items as $key => $parent_item ) {

$classes = (array) $parent_item->classes;

$menu_items[$key]->current_item_ancestor = false;

$menu_items[$key]->current_item_parent = false;

if (

isset( $parent_item->type ) &&

(

// ancestral post object

(

'post_type' == $parent_item->type &&

! empty( $queried_object->post_type ) &&

is_post_type_hierarchical( $queried_object->post_type ) &&

in_array( $parent_item->object_id, $queried_object->ancestors ) &&

$parent_item->object != $queried_object->ID

) ||

// ancestral term

(

'taxonomy' == $parent_item->type &&

isset( $possible_taxonomy_ancestors[ $parent_item->object ] ) &&

in_array( $parent_item->object_id, $possible_taxonomy_ancestors[ $parent_item->object ] ) &&

(

! isset( $queried_object->term_id ) ||

$parent_item->object_id != $queried_object->term_id

)

) {

$classes[] = empty( $queried_object->taxonomy ) ? 'current-' . $queried_object->post_type . '-ancestor' : 'current-' . $queried_object->taxonomy . '-ancestor';

}

if ( in_array( intval( $parent_item->db_id ), $active_ancestor_item_ids ) ) {

$classes[] = 'current-menu-ancestor';

$menu_items[$key]->current_item_ancestor = true;

}

if ( in_array( $parent_item->db_id, $active_parent_item_ids ) ) {

$classes[] = 'current-menu-parent';

$menu_items[$key]->current_item_parent = true;

}

if ( in_array( $parent_item->object_id, $active_parent_object_ids ) )

$classes[] = 'current-' . $active_object . '-parent';

if ( 'post_type' == $parent_item->type && 'page' == $parent_item->object ) {

// Back compat classes for pages to match wp_page_menu()

if ( in_array('current-menu-parent', $classes) )

$classes[] = 'current_page_parent';

if ( in_array('current-menu-ancestor', $classes) )

$classes[] = 'current_page_ancestor';

}

$menu_items[$key]->classes = array_unique( $classes );

}

/**

* Retrieve the HTML list content for nav menu items.

* @uses Walker_Nav_Menu to create HTML list content.

* @since 3.0.0

* @see Walker::walk() for parameters and return description.

function walk_nav_menu_tree( $items, $depth, $r ) {

$walker = ( empty($r->walker) ) ? new Walker_Nav_Menu : $r->walker;

$args = array( $items, $depth, $r );

return call_user_func_array( array($walker, 'walk'), $args );

}

/**

* Prevents a menu item ID from being used more than once.

* @since 3.0.1

* @access private

function _nav_menu_item_id_use_once( $id, $item ) {

static $_used_ids = array();

if ( in_array( $item->ID, $_used_ids ) )

return '';

$_used_ids[] = $item->ID;

return $id;

}

add_filter( 'nav_menu_item_id', '_nav_menu_item_id_use_once', 10, 2 );

- Wordpress

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WordPressを読む 70 /blog/wp-includes/nav-menu-template.php

WordPressを読む　70 /blog/wp-includes/nav-menu-template.php