1<?php
  2/**
  3 * Nav Menu API: Template functions
  4 *
  5 * @package WordPress
  6 * @subpackage Nav_Menus
  7 * @since 3.0.0
  8 */
  9
 10// Don't load directly.
 11if ( ! defined( 'ABSPATH' ) ) {
 12	die( '-1' );
 13}
 14
 15/** Walker_Nav_Menu class */
 16require_once ABSPATH . WPINC . '/class-walker-nav-menu.php';
 17
 18/**
 19 * Displays a navigation menu.
 20 *
 21 * @since 3.0.0
 22 * @since 4.7.0 Added the `item_spacing` argument.
 23 * @since 5.5.0 Added the `container_aria_label` argument.
 24 *
 25 * @param array $args {
 26 *     Optional. Array of nav menu arguments.
 27 *
 28 *     @type int|string|WP_Term $menu                 Desired menu. Accepts a menu ID, slug, name, or object.
 29 *                                                    Default empty.
 30 *     @type string             $menu_class           CSS class to use for the ul element which forms the menu.
 31 *                                                    Default 'menu'.
 32 *     @type string             $menu_id              The ID that is applied to the ul element which forms the menu.
 33 *                                                    Default is the menu slug, incremented.
 34 *     @type string             $container            Whether to wrap the ul, and what to wrap it with.
 35 *                                                    Default 'div'.
 36 *     @type string             $container_class      Class that is applied to the container.
 37 *                                                    Default 'menu-{menu slug}-container'.
 38 *     @type string             $container_id         The ID that is applied to the container. Default empty.
 39 *     @type string             $container_aria_label The aria-label attribute that is applied to the container
 40 *                                                    when it's a nav element. Default empty.
 41 *     @type callable|false     $fallback_cb          If the menu doesn't exist, a callback function will fire.
 42 *                                                    Default is 'wp_page_menu'. Set to false for no fallback.
 43 *     @type string             $before               Text before the link markup. Default empty.
 44 *     @type string             $after                Text after the link markup. Default empty.
 45 *     @type string             $link_before          Text before the link text. Default empty.
 46 *     @type string             $link_after           Text after the link text. Default empty.
 47 *     @type bool               $echo                 Whether to echo the menu or return it. Default true.
 48 *     @type int                $depth                How many levels of the hierarchy are to be included.
 49 *                                                    0 means all. Default 0.
 50 *                                                    Default 0.
 51 *     @type object             $walker               Instance of a custom walker class. Default empty.
 52 *     @type string             $theme_location       Theme location to be used. Must be registered with
 53 *                                                    register_nav_menu() in order to be selectable by the user.
 54 *     @type string             $items_wrap           How the list items should be wrapped. Uses printf() format with
 55 *                                                    numbered placeholders. Default is a ul with an id and class.
 56 *     @type string             $item_spacing         Whether to preserve whitespace within the menu's HTML.
 57 *                                                    Accepts 'preserve' or 'discard'. Default 'preserve'.
 58 * }
 59 * @return void|string|false Void if 'echo' argument is true, menu output if 'echo' is false.
 60 *                           False if there are no items or no menu was found.
 61 */
 62function wp_nav_menu( $args = array() ) {
 63	static $menu_id_slugs = array();
 64
 65	$defaults = array(
 66		'menu'                 => '',
 67		'container'            => 'div',
 68		'container_class'      => '',
 69		'container_id'         => '',
 70		'container_aria_label' => '',
 71		'menu_class'           => 'menu',
 72		'menu_id'              => '',
 73		'echo'                 => true,
 74		'fallback_cb'          => 'wp_page_menu',
 75		'before'               => '',
 76		'after'                => '',
 77		'link_before'          => '',
 78		'link_after'           => '',
 79		'items_wrap'           => '<ul id="%1$s" class="%2$s">%3$s</ul>',
 80		'item_spacing'         => 'preserve',
 81		'depth'                => 0,
 82		'walker'               => '',
 83		'theme_location'       => '',
 84	);
 85
 86	$args = wp_parse_args( $args, $defaults );
 87
 88	if ( ! in_array( $args['item_spacing'], array( 'preserve', 'discard' ), true ) ) {
 89		// Invalid value, fall back to default.
 90		$args['item_spacing'] = $defaults['item_spacing'];
 91	}
 92
 93	/**
 94	 * Filters the arguments used to display a navigation menu.
 95	 *
 96	 * @since 3.0.0
 97	 *
 98	 * @see wp_nav_menu()
 99	 *
100	 * @param array $args Array of wp_nav_menu() arguments.
101	 */
102	$args = apply_filters( 'wp_nav_menu_args', $args );
103	$args = (object) $args;
104
105	/**
106	 * Filters whether to short-circuit the wp_nav_menu() output.
107	 *
108	 * Returning a non-null value from the filter will short-circuit wp_nav_menu(),
109	 * echoing that value if $args->echo is true, returning that value otherwise.
110	 *
111	 * @since 3.9.0
112	 *
113	 * @see wp_nav_menu()
114	 *
115	 * @param string|null $output Nav menu output to short-circuit with. Default null.
116	 * @param stdClass    $args   An object containing wp_nav_menu() arguments.
117	 */
118	$nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args );
119
120	if ( null !== $nav_menu ) {
121		if ( $args->echo ) {
122			echo $nav_menu;
123			return;
124		}
125
126		return $nav_menu;
127	}
128
129	// Get the nav menu based on the requested menu.
130	$menu = wp_get_nav_menu_object( $args->menu );
131
132	// Get the nav menu based on the theme_location.
133	$locations = get_nav_menu_locations();
134	if ( ! $menu && $args->theme_location && $locations && isset( $locations[ $args->theme_location ] ) ) {
135		$menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );
136	}
137
138	// Get the first menu that has items if we still can't find a menu.
139	if ( ! $menu && ! $args->theme_location ) {
140		$menus = wp_get_nav_menus();
141		foreach ( $menus as $menu_maybe ) {
142			$menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) );
143			if ( $menu_items ) {
144				$menu = $menu_maybe;
145				break;
146			}
147		}
148	}
149
150	if ( empty( $args->menu ) ) {
151		$args->menu = $menu;
152	}
153
154	// If the menu exists, get its items.
155	if ( $menu && ! is_wp_error( $menu ) && ! isset( $menu_items ) ) {
156		$menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );
157	}
158
159	/*
160	 * If no menu was found:
161	 *  - Fall back (if one was specified), or bail.
162	 *
163	 * If no menu items were found:
164	 *  - Fall back, but only if no theme location was specified.
165	 *  - Otherwise, bail.
166	 */
167	if ( ( ! $menu || is_wp_error( $menu ) || ( isset( $menu_items ) && empty( $menu_items ) && ! $args->theme_location ) )
168		&& isset( $args->fallback_cb ) && $args->fallback_cb && is_callable( $args->fallback_cb ) ) {
169			return call_user_func( $args->fallback_cb, (array) $args );
170	}
171
172	if ( ! $menu || is_wp_error( $menu ) ) {
173		return false;
174	}
175
176	$nav_menu = '';
177	$items    = '';
178
179	$show_container = false;
180	if ( $args->container ) {
181		/**
182		 * Filters the list of HTML tags that are valid for use as menu containers.
183		 *
184		 * @since 3.0.0
185		 *
186		 * @param string[] $tags The acceptable HTML tags for use as menu containers.
187		 *                       Default is array containing 'div' and 'nav'.
188		 */
189		$allowed_tags = apply_filters( 'wp_nav_menu_container_allowedtags', array( 'div', 'nav' ) );
190
191		if ( is_string( $args->container ) && in_array( $args->container, $allowed_tags, true ) ) {
192			$show_container = true;
193			$class          = $args->container_class ? ' class="' . esc_attr( $args->container_class ) . '"' : ' class="menu-' . $menu->slug . '-container"';
194			$id             = $args->container_id ? ' id="' . esc_attr( $args->container_id ) . '"' : '';
195			$aria_label     = ( 'nav' === $args->container && $args->container_aria_label ) ? ' aria-label="' . esc_attr( $args->container_aria_label ) . '"' : '';
196			$nav_menu      .= '<' . $args->container . $id . $class . $aria_label . '>';
197		}
198	}
199
200	// Set up the $menu_item variables.
201	_wp_menu_item_classes_by_context( $menu_items );
202
203	$sorted_menu_items        = array();
204	$menu_items_with_children = array();
205	foreach ( (array) $menu_items as $menu_item ) {
206		/*
207		 * Fix invalid `menu_item_parent`. See: https://core.trac.wordpress.org/ticket/56926.
208		 * Compare as strings. Plugins may change the ID to a string.
209		 */
210		if ( (string) $menu_item->ID === (string) $menu_item->menu_item_parent ) {
211			$menu_item->menu_item_parent = 0;
212		}
213
214		$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;
215		if ( $menu_item->menu_item_parent ) {
216			$menu_items_with_children[ $menu_item->menu_item_parent ] = true;
217		}
218	}
219
220	// Add the menu-item-has-children class where applicable.
221	if ( $menu_items_with_children ) {
222		foreach ( $sorted_menu_items as &$menu_item ) {
223			if ( isset( $menu_items_with_children[ $menu_item->ID ] ) ) {
224				$menu_item->classes[] = 'menu-item-has-children';
225			}
226		}
227	}
228
229	unset( $menu_items, $menu_item );
230
231	/**
232	 * Filters the sorted list of menu item objects before generating the menu's HTML.
233	 *
234	 * @since 3.1.0
235	 *
236	 * @param array    $sorted_menu_items The menu items, sorted by each menu item's menu order.
237	 * @param stdClass $args              An object containing wp_nav_menu() arguments.
238	 */
239	$sorted_menu_items = apply_filters( 'wp_nav_menu_objects', $sorted_menu_items, $args );
240
241	$items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, $args );
242	unset( $sorted_menu_items );
243
244	// Attributes.
245	if ( ! empty( $args->menu_id ) ) {
246		$wrap_id = $args->menu_id;
247	} else {
248		$wrap_id = 'menu-' . $menu->slug;
249
250		while ( in_array( $wrap_id, $menu_id_slugs, true ) ) {
251			if ( preg_match( '#-(\d+)$#', $wrap_id, $matches ) ) {
252				$wrap_id = preg_replace( '#-(\d+)$#', '-' . ++$matches[1], $wrap_id );
253			} else {
254				$wrap_id = $wrap_id . '-1';
255			}
256		}
257	}
258	$menu_id_slugs[] = $wrap_id;
259
260	$wrap_class = $args->menu_class ? $args->menu_class : '';
261
262	/**
263	 * Filters the HTML list content for navigation menus.
264	 *
265	 * @since 3.0.0
266	 *
267	 * @see wp_nav_menu()
268	 *
269	 * @param string   $items The HTML list content for the menu items.
270	 * @param stdClass $args  An object containing wp_nav_menu() arguments.
271	 */
272	$items = apply_filters( 'wp_nav_menu_items', $items, $args );
273	/**
274	 * Filters the HTML list content for a specific navigation menu.
275	 *
276	 * @since 3.0.0
277	 *
278	 * @see wp_nav_menu()
279	 *
280	 * @param string   $items The HTML list content for the menu items.
281	 * @param stdClass $args  An object containing wp_nav_menu() arguments.
282	 */
283	$items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args );
284
285	// Don't print any markup if there are no items at this point.
286	if ( empty( $items ) ) {
287		return false;
288	}
289
290	$nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items );
291	unset( $items );
292
293	if ( $show_container ) {
294		$nav_menu .= '</' . $args->container . '>';
295	}
296
297	/**
298	 * Filters the HTML content for navigation menus.
299	 *
300	 * @since 3.0.0
301	 *
302	 * @see wp_nav_menu()
303	 *
304	 * @param string   $nav_menu The HTML content for the navigation menu.
305	 * @param stdClass $args     An object containing wp_nav_menu() arguments.
306	 */
307	$nav_menu = apply_filters( 'wp_nav_menu', $nav_menu, $args );
308
309	if ( $args->echo ) {
310		echo $nav_menu;
311	} else {
312		return $nav_menu;
313	}
314}
315
316/**
317 * Adds the class property classes for the current context, if applicable.
318 *
319 * @access private
320 * @since 3.0.0
321 *
322 * @global WP_Query   $wp_query   WordPress Query object.
323 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
324 *
325 * @param array $menu_items The current menu item objects to which to add the class property information.
326 */
327function _wp_menu_item_classes_by_context( &$menu_items ) {
328	global $wp_query, $wp_rewrite;
329
330	$queried_object    = $wp_query->get_queried_object();
331	$queried_object_id = (int) $wp_query->queried_object_id;
332
333	$active_object               = '';
334	$active_ancestor_item_ids    = array();
335	$active_parent_item_ids      = array();
336	$active_parent_object_ids    = array();
337	$possible_taxonomy_ancestors = array();
338	$possible_object_parents     = array();
339	$home_page_id                = (int) get_option( 'page_for_posts' );
340
341	if ( $wp_query->is_singular && ! empty( $queried_object->post_type ) && ! is_post_type_hierarchical( $queried_object->post_type ) ) {
342		foreach ( (array) get_object_taxonomies( $queried_object->post_type ) as $taxonomy ) {
343			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
344				$term_hierarchy = _get_term_hierarchy( $taxonomy );
345				$terms          = wp_get_object_terms( $queried_object_id, $taxonomy, array( 'fields' => 'ids' ) );
346				if ( is_array( $terms ) ) {
347					$possible_object_parents = array_merge( $possible_object_parents, $terms );
348					$term_to_ancestor        = array();
349					foreach ( (array) $term_hierarchy as $ancestor => $descendents ) {
350						foreach ( (array) $descendents as $desc ) {
351							$term_to_ancestor[ $desc ] = $ancestor;
352						}
353					}
354
355					foreach ( $terms as $desc ) {
356						do {
357							$possible_taxonomy_ancestors[ $taxonomy ][] = $desc;
358							if ( isset( $term_to_ancestor[ $desc ] ) ) {
359								$_desc = $term_to_ancestor[ $desc ];
360								unset( $term_to_ancestor[ $desc ] );
361								$desc = $_desc;
362							} else {
363								$desc = 0;
364							}
365						} while ( ! empty( $desc ) );
366					}
367				}
368			}
369		}
370	} elseif ( ! empty( $queried_object->taxonomy ) && is_taxonomy_hierarchical( $queried_object->taxonomy ) ) {
371		$term_hierarchy   = _get_term_hierarchy( $queried_object->taxonomy );
372		$term_to_ancestor = array();
373		foreach ( (array) $term_hierarchy as $ancestor => $descendents ) {
374			foreach ( (array) $descendents as $desc ) {
375				$term_to_ancestor[ $desc ] = $ancestor;
376			}
377		}
378		$desc = $queried_object->term_id;
379		do {
380			$possible_taxonomy_ancestors[ $queried_object->taxonomy ][] = $desc;
381			if ( isset( $term_to_ancestor[ $desc ] ) ) {
382				$_desc = $term_to_ancestor[ $desc ];
383				unset( $term_to_ancestor[ $desc ] );
384				$desc = $_desc;
385			} else {
386				$desc = 0;
387			}
388		} while ( ! empty( $desc ) );
389	}
390
391	$possible_object_parents = array_filter( $possible_object_parents );
392
393	$front_page_url         = home_url();
394	$front_page_id          = (int) get_option( 'page_on_front' );
395	$privacy_policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );
396
397	foreach ( (array) $menu_items as $key => $menu_item ) {
398
399		$menu_items[ $key ]->current = false;
400
401		$classes   = (array) $menu_item->classes;
402		$classes[] = 'menu-item';
403		$classes[] = 'menu-item-type-' . $menu_item->type;
404		$classes[] = 'menu-item-object-' . $menu_item->object;
405
406		// This menu item is set as the 'Front Page'.
407		if ( 'post_type' === $menu_item->type && $front_page_id === (int) $menu_item->object_id ) {
408			$classes[] = 'menu-item-home';
409		}
410
411		// This menu item is set as the 'Privacy Policy Page'.
412		if ( 'post_type' === $menu_item->type && $privacy_policy_page_id === (int) $menu_item->object_id ) {
413			$classes[] = 'menu-item-privacy-policy';
414		}
415
416		// If the menu item corresponds to a taxonomy term for the currently queried non-hierarchical post object.
417		if ( $wp_query->is_singular && 'taxonomy' === $menu_item->type
418			&& in_array( (int) $menu_item->object_id, $possible_object_parents, true )
419		) {
420			$active_parent_object_ids[] = (int) $menu_item->object_id;
421			$active_parent_item_ids[]   = (int) $menu_item->db_id;
422			$active_object              = $queried_object->post_type;
423
424			// If the menu item corresponds to the currently queried post or taxonomy object.
425		} elseif (
426			(int) $menu_item->object_id === $queried_object_id
427			&& (
428				( ! empty( $home_page_id ) && 'post_type' === $menu_item->type
429					&& $wp_query->is_home && $home_page_id === (int) $menu_item->object_id )
430				|| ( 'post_type' === $menu_item->type && $wp_query->is_singular )
431				|| ( 'taxonomy' === $menu_item->type
432					&& ( $wp_query->is_category || $wp_query->is_tag || $wp_query->is_tax )
433					&& $queried_object->taxonomy === $menu_item->object )
434			)
435		) {
436			$classes[]                   = 'current-menu-item';
437			$menu_items[ $key ]->current = true;
438			$ancestor_id                 = (int) $menu_item->db_id;
439
440			while (
441				( $ancestor_id = (int) get_post_meta( $ancestor_id, '_menu_item_menu_item_parent', true ) )
442				&& ! in_array( $ancestor_id, $active_ancestor_item_ids, true )
443			) {
444				$active_ancestor_item_ids[] = $ancestor_id;
445			}
446
447			if ( 'post_type' === $menu_item->type && 'page' === $menu_item->object ) {
448				// Back compat classes for pages to match wp_page_menu().
449				$classes[] = 'page_item';
450				$classes[] = 'page-item-' . $menu_item->object_id;
451				$classes[] = 'current_page_item';
452			}
453
454			$active_parent_item_ids[]   = (int) $menu_item->menu_item_parent;
455			$active_parent_object_ids[] = (int) $menu_item->post_parent;
456			$active_object              = $menu_item->object;
457
458			// If the menu item corresponds to the currently queried post type archive.
459		} elseif (
460			'post_type_archive' === $menu_item->type
461			&& is_post_type_archive( array( $menu_item->object ) )
462		) {
463			$classes[]                   = 'current-menu-item';
464			$menu_items[ $key ]->current = true;
465			$ancestor_id                 = (int) $menu_item->db_id;
466
467			while (
468				( $ancestor_id = (int) get_post_meta( $ancestor_id, '_menu_item_menu_item_parent', true ) )
469				&& ! in_array( $ancestor_id, $active_ancestor_item_ids, true )
470			) {
471				$active_ancestor_item_ids[] = $ancestor_id;
472			}
473
474			$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;
475
476			// If the menu item corresponds to the currently requested URL.
477		} elseif ( 'custom' === $menu_item->object && isset( $_SERVER['HTTP_HOST'] ) ) {
478			$_root_relative_current = untrailingslashit( $_SERVER['REQUEST_URI'] );
479
480			// If it's the customize page then it will strip the query var off the URL before entering the comparison block.
481			if ( is_customize_preview() ) {
482				$_root_relative_current = strtok( untrailingslashit( $_SERVER['REQUEST_URI'] ), '?' );
483			}
484
485			$current_url        = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_root_relative_current );
486			$raw_item_url       = strpos( $menu_item->url, '#' ) ? substr( $menu_item->url, 0, strpos( $menu_item->url, '#' ) ) : $menu_item->url;
487			$item_url           = set_url_scheme( untrailingslashit( $raw_item_url ) );
488			$_indexless_current = untrailingslashit( preg_replace( '/' . preg_quote( $wp_rewrite->index, '/' ) . '$/', '', $current_url ) );
489
490			$matches = array(
491				$current_url,
492				urldecode( $current_url ),
493				$_indexless_current,
494				urldecode( $_indexless_current ),
495				$_root_relative_current,
496				urldecode( $_root_relative_current ),
497			);
498
499			if ( $raw_item_url && in_array( $item_url, $matches, true ) ) {
500				$classes[]                   = 'current-menu-item';
501				$menu_items[ $key ]->current = true;
502				$ancestor_id                 = (int) $menu_item->db_id;
503
504				while (
505					( $ancestor_id = (int) get_post_meta( $ancestor_id, '_menu_item_menu_item_parent', true ) )
506					&& ! in_array( $ancestor_id, $active_ancestor_item_ids, true )
507				) {
508					$active_ancestor_item_ids[] = $ancestor_id;
509				}
510
511				if ( in_array( home_url(), array( untrailingslashit( $current_url ), untrailingslashit( $_indexless_current ) ), true ) ) {
512					// Back compat for home link to match wp_page_menu().
513					$classes[] = 'current_page_item';
514				}
515				$active_parent_item_ids[]   = (int) $menu_item->menu_item_parent;
516				$active_parent_object_ids[] = (int) $menu_item->post_parent;
517				$active_object              = $menu_item->object;
518
519				// Give front page item the 'current-menu-item' class when extra query arguments are involved.
520			} elseif ( $item_url === $front_page_url && is_front_page() ) {
521				$classes[] = 'current-menu-item';
522			}
523
524			if ( untrailingslashit( $item_url ) === home_url() ) {
525				$classes[] = 'menu-item-home';
526			}
527		}
528
529		// Back-compat with wp_page_menu(): add "current_page_parent" to static home page link for any non-page query.
530		if ( ! empty( $home_page_id ) && 'post_type' === $menu_item->type
531			&& empty( $wp_query->is_page ) && $home_page_id === (int) $menu_item->object_id
532		) {
533			$classes[] = 'current_page_parent';
534		}
535
536		$menu_items[ $key ]->classes = array_unique( $classes );
537	}
538	$active_ancestor_item_ids = array_filter( array_unique( $active_ancestor_item_ids ) );
539	$active_parent_item_ids   = array_filter( array_unique( $active_parent_item_ids ) );
540	$active_parent_object_ids = array_filter( array_unique( $active_parent_object_ids ) );
541
542	// Set parent's class.
543	foreach ( (array) $menu_items as $key => $parent_item ) {
544		$classes                                   = (array) $parent_item->classes;
545		$menu_items[ $key ]->current_item_ancestor = false;
546		$menu_items[ $key ]->current_item_parent   = false;
547
548		if (
549			isset( $parent_item->type )
550			&& (
551				// Ancestral post object.
552				(
553					'post_type' === $parent_item->type
554					&& ! empty( $queried_object->post_type )
555					&& is_post_type_hierarchical( $queried_object->post_type )
556					&& in_array( (int) $parent_item->object_id, $queried_object->ancestors, true )
557					&& (int) $parent_item->object_id !== $queried_object->ID
558				) ||
559
560				// Ancestral term.
561				(
562					'taxonomy' === $parent_item->type
563					&& isset( $possible_taxonomy_ancestors[ $parent_item->object ] )
564					&& in_array( (int) $parent_item->object_id, $possible_taxonomy_ancestors[ $parent_item->object ], true )
565					&& (
566						! isset( $queried_object->term_id ) ||
567						(int) $parent_item->object_id !== $queried_object->term_id
568					)
569				)
570			)
571		) {
572			if ( ! empty( $queried_object->taxonomy ) ) {
573				$classes[] = 'current-' . $queried_object->taxonomy . '-ancestor';
574			} else {
575				$classes[] = 'current-' . $queried_object->post_type . '-ancestor';
576			}
577		}
578
579		if ( in_array( (int) $parent_item->db_id, $active_ancestor_item_ids, true ) ) {
580			$classes[] = 'current-menu-ancestor';
581
582			$menu_items[ $key ]->current_item_ancestor = true;
583		}
584		if ( in_array( (int) $parent_item->db_id, $active_parent_item_ids, true ) ) {
585			$classes[] = 'current-menu-parent';
586
587			$menu_items[ $key ]->current_item_parent = true;
588		}
589		if ( in_array( (int) $parent_item->object_id, $active_parent_object_ids, true ) ) {
590			$classes[] = 'current-' . $active_object . '-parent';
591		}
592
593		if ( 'post_type' === $parent_item->type && 'page' === $parent_item->object ) {
594			// Back compat classes for pages to match wp_page_menu().
595			if ( in_array( 'current-menu-parent', $classes, true ) ) {
596				$classes[] = 'current_page_parent';
597			}
598			if ( in_array( 'current-menu-ancestor', $classes, true ) ) {
599				$classes[] = 'current_page_ancestor';
600			}
601		}
602
603		$menu_items[ $key ]->classes = array_unique( $classes );
604	}
605}
606
607/**
608 * Retrieves the HTML list content for nav menu items.
609 *
610 * @uses Walker_Nav_Menu to create HTML list content.
611 * @since 3.0.0
612 *
613 * @param array    $items The menu items, sorted by each menu item's menu order.
614 * @param int      $depth Depth of the item in reference to parents.
615 * @param stdClass $args  An object containing wp_nav_menu() arguments.
616 * @return string The HTML list content for the menu items.
617 */
618function walk_nav_menu_tree( $items, $depth, $args ) {
619	$walker = ( empty( $args->walker ) ) ? new Walker_Nav_Menu() : $args->walker;
620
621	return $walker->walk( $items, $depth, $args );
622}
623
624/**
625 * Prevents a menu item ID from being used more than once.
626 *
627 * @since 3.0.1
628 * @access private
629 *
630 * @param string $id
631 * @param object $item
632 * @return string
633 */
634function _nav_menu_item_id_use_once( $id, $item ) {
635	static $_used_ids = array();
636
637	if ( in_array( $item->ID, $_used_ids, true ) ) {
638		return '';
639	}
640
641	$_used_ids[] = $item->ID;
642
643	return $id;
644}
645
646/**
647 * Remove the `menu-item-has-children` class from bottom level menu items.
648 *
649 * This runs on the {@see 'nav_menu_css_class'} filter. The $args and $depth
650 * parameters were added after the filter was originally introduced in
651 * WordPress 3.0.0 so this needs to allow for cases in which the filter is
652 * called without them.
653 *
654 * @see https://core.trac.wordpress.org/ticket/56926
655 *
656 * @since 6.2.0
657 *
658 * @param string[]       $classes   Array of the CSS classes that are applied to the menu item's `<li>` element.
659 * @param WP_Post        $menu_item The current menu item object.
660 * @param stdClass|false $args      An object of wp_nav_menu() arguments. Default false ($args unspecified when filter is called).
661 * @param int|false      $depth     Depth of menu item. Default false ($depth unspecified when filter is called).
662 * @return string[] Modified nav menu classes.
663 */
664function wp_nav_menu_remove_menu_item_has_children_class( $classes, $menu_item, $args = false, $depth = false ) {
665	/*
666	 * Account for the filter being called without the $args or $depth parameters.
667	 *
668	 * This occurs when a theme uses a custom walker calling the `nav_menu_css_class`
669	 * filter using the legacy formats prior to the introduction of the $args and
670	 * $depth parameters.
671	 *
672	 * As both of these parameters are required for this function to determine
673	 * both the current and maximum depth of the menu tree, the function does not
674	 * attempt to remove the `menu-item-has-children` class if these parameters
675	 * are not set.
676	 */
677	if ( false === $depth || false === $args ) {
678		return $classes;
679	}
680
681	// Max-depth is 1-based.
682	$max_depth = isset( $args->depth ) ? (int) $args->depth : 0;
683	// Depth is 0-based so needs to be increased by one.
684	$depth = $depth + 1;
685
686	// Complete menu tree is displayed.
687	if ( 0 === $max_depth ) {
688		return $classes;
689	}
690
691	/*
692	 * Remove the `menu-item-has-children` class from bottom level menu items.
693	 * -1 is used to display all menu items in one level so the class should
694	 * be removed from all menu items.
695	 */
696	if ( -1 === $max_depth || $depth >= $max_depth ) {
697		$classes = array_diff( $classes, array( 'menu-item-has-children' ) );
698	}
699
700	return $classes;
701}
702