Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1331 insertions, 0 deletions

diff --git a/wp-includes/nav-menu.php b/wp-includes/nav-menu.php
new file mode 100644
index 0000000..b43e456
--- /dev/null
+++ b/wp-includes/nav-menu.php
@@ -0,0 +1,1331 @@
+<?php
+/**
+ * Navigation Menu functions
+ *
+ * @package WordPress
+ * @subpackage Nav_Menus
+ * @since 3.0.0
+ */
+
+/**
+ * Returns a navigation menu object.
+ *
+ * @since 3.0.0
+ *
+ * @param int|string|WP_Term $menu Menu ID, slug, name, or object.
+ * @return WP_Term|false Menu object on success, false if $menu param isn't supplied or term does not exist.
+ */
+function wp_get_nav_menu_object( $menu ) {
+	$menu_obj = false;
+
+	if ( is_object( $menu ) ) {
+		$menu_obj = $menu;
+	}
+
+	if ( $menu && ! $menu_obj ) {
+		$menu_obj = get_term( $menu, 'nav_menu' );
+
+		if ( ! $menu_obj ) {
+			$menu_obj = get_term_by( 'slug', $menu, 'nav_menu' );
+		}
+
+		if ( ! $menu_obj ) {
+			$menu_obj = get_term_by( 'name', $menu, 'nav_menu' );
+		}
+	}
+
+	if ( ! $menu_obj || is_wp_error( $menu_obj ) ) {
+		$menu_obj = false;
+	}
+
+	/**
+	 * Filters the nav_menu term retrieved for wp_get_nav_menu_object().
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param WP_Term|false      $menu_obj Term from nav_menu taxonomy, or false if nothing had been found.
+	 * @param int|string|WP_Term $menu     The menu ID, slug, name, or object passed to wp_get_nav_menu_object().
+	 */
+	return apply_filters( 'wp_get_nav_menu_object', $menu_obj, $menu );
+}
+
+/**
+ * Determines whether the given ID is a navigation menu.
+ *
+ * Returns true if it is; false otherwise.
+ *
+ * @since 3.0.0
+ *
+ * @param int|string|WP_Term $menu Menu ID, slug, name, or object of menu to check.
+ * @return bool Whether the menu exists.
+ */
+function is_nav_menu( $menu ) {
+	if ( ! $menu ) {
+		return false;
+	}
+
+	$menu_obj = wp_get_nav_menu_object( $menu );
+
+	if (
+		$menu_obj &&
+		! is_wp_error( $menu_obj ) &&
+		! empty( $menu_obj->taxonomy ) &&
+		'nav_menu' === $menu_obj->taxonomy
+	) {
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Registers navigation menu locations for a theme.
+ *
+ * @since 3.0.0
+ *
+ * @global array $_wp_registered_nav_menus
+ *
+ * @param string[] $locations Associative array of menu location identifiers (like a slug) and descriptive text.
+ */
+function register_nav_menus( $locations = array() ) {
+	global $_wp_registered_nav_menus;
+
+	add_theme_support( 'menus' );
+
+	foreach ( $locations as $key => $value ) {
+		if ( is_int( $key ) ) {
+			_doing_it_wrong( __FUNCTION__, __( 'Nav menu locations must be strings.' ), '5.3.0' );
+			break;
+		}
+	}
+
+	$_wp_registered_nav_menus = array_merge( (array) $_wp_registered_nav_menus, $locations );
+}
+
+/**
+ * Unregisters a navigation menu location for a theme.
+ *
+ * @since 3.1.0
+ *
+ * @global array $_wp_registered_nav_menus
+ *
+ * @param string $location The menu location identifier.
+ * @return bool True on success, false on failure.
+ */
+function unregister_nav_menu( $location ) {
+	global $_wp_registered_nav_menus;
+
+	if ( is_array( $_wp_registered_nav_menus ) && isset( $_wp_registered_nav_menus[ $location ] ) ) {
+		unset( $_wp_registered_nav_menus[ $location ] );
+		if ( empty( $_wp_registered_nav_menus ) ) {
+			_remove_theme_support( 'menus' );
+		}
+		return true;
+	}
+	return false;
+}
+
+/**
+ * Registers a navigation menu location for a theme.
+ *
+ * @since 3.0.0
+ *
+ * @param string $location    Menu location identifier, like a slug.
+ * @param string $description Menu location descriptive text.
+ */
+function register_nav_menu( $location, $description ) {
+	register_nav_menus( array( $location => $description ) );
+}
+/**
+ * Retrieves all registered navigation menu locations in a theme.
+ *
+ * @since 3.0.0
+ *
+ * @global array $_wp_registered_nav_menus
+ *
+ * @return string[] Associative array of registered navigation menu descriptions keyed
+ *                  by their location. If none are registered, an empty array.
+ */
+function get_registered_nav_menus() {
+	global $_wp_registered_nav_menus;
+	if ( isset( $_wp_registered_nav_menus ) ) {
+		return $_wp_registered_nav_menus;
+	}
+	return array();
+}
+
+/**
+ * Retrieves all registered navigation menu locations and the menus assigned to them.
+ *
+ * @since 3.0.0
+ *
+ * @return int[] Associative array of registered navigation menu IDs keyed by their
+ *               location name. If none are registered, an empty array.
+ */
+function get_nav_menu_locations() {
+	$locations = get_theme_mod( 'nav_menu_locations' );
+	return ( is_array( $locations ) ) ? $locations : array();
+}
+
+/**
+ * Determines whether a registered nav menu location has a menu assigned to it.
+ *
+ * @since 3.0.0
+ *
+ * @param string $location Menu location identifier.
+ * @return bool Whether location has a menu.
+ */
+function has_nav_menu( $location ) {
+	$has_nav_menu = false;
+
+	$registered_nav_menus = get_registered_nav_menus();
+	if ( isset( $registered_nav_menus[ $location ] ) ) {
+		$locations    = get_nav_menu_locations();
+		$has_nav_menu = ! empty( $locations[ $location ] );
+	}
+
+	/**
+	 * Filters whether a nav menu is assigned to the specified location.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param bool   $has_nav_menu Whether there is a menu assigned to a location.
+	 * @param string $location     Menu location.
+	 */
+	return apply_filters( 'has_nav_menu', $has_nav_menu, $location );
+}
+
+/**
+ * Returns the name of a navigation menu.
+ *
+ * @since 4.9.0
+ *
+ * @param string $location Menu location identifier.
+ * @return string Menu name.
+ */
+function wp_get_nav_menu_name( $location ) {
+	$menu_name = '';
+
+	$locations = get_nav_menu_locations();
+
+	if ( isset( $locations[ $location ] ) ) {
+		$menu = wp_get_nav_menu_object( $locations[ $location ] );
+
+		if ( $menu && $menu->name ) {
+			$menu_name = $menu->name;
+		}
+	}
+
+	/**
+	 * Filters the navigation menu name being returned.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param string $menu_name Menu name.
+	 * @param string $location  Menu location identifier.
+	 */
+	return apply_filters( 'wp_get_nav_menu_name', $menu_name, $location );
+}
+
+/**
+ * Determines whether the given ID is a nav menu item.
+ *
+ * @since 3.0.0
+ *
+ * @param int $menu_item_id The ID of the potential nav menu item.
+ * @return bool Whether the given ID is that of a nav menu item.
+ */
+function is_nav_menu_item( $menu_item_id = 0 ) {
+	return ( ! is_wp_error( $menu_item_id ) && ( 'nav_menu_item' === get_post_type( $menu_item_id ) ) );
+}
+
+/**
+ * Creates a navigation menu.
+ *
+ * Note that `$menu_name` is expected to be pre-slashed.
+ *
+ * @since 3.0.0
+ *
+ * @param string $menu_name Menu name.
+ * @return int|WP_Error Menu ID on success, WP_Error object on failure.
+ */
+function wp_create_nav_menu( $menu_name ) {
+	// expected_slashed ($menu_name)
+	return wp_update_nav_menu_object( 0, array( 'menu-name' => $menu_name ) );
+}
+
+/**
+ * Deletes a navigation menu.
+ *
+ * @since 3.0.0
+ *
+ * @param int|string|WP_Term $menu Menu ID, slug, name, or object.
+ * @return bool|WP_Error True on success, false or WP_Error object on failure.
+ */
+function wp_delete_nav_menu( $menu ) {
+	$menu = wp_get_nav_menu_object( $menu );
+	if ( ! $menu ) {
+		return false;
+	}
+
+	$menu_objects = get_objects_in_term( $menu->term_id, 'nav_menu' );
+	if ( ! empty( $menu_objects ) ) {
+		foreach ( $menu_objects as $item ) {
+			wp_delete_post( $item );
+		}
+	}
+
+	$result = wp_delete_term( $menu->term_id, 'nav_menu' );
+
+	// Remove this menu from any locations.
+	$locations = get_nav_menu_locations();
+	foreach ( $locations as $location => $menu_id ) {
+		if ( $menu_id == $menu->term_id ) {
+			$locations[ $location ] = 0;
+		}
+	}
+	set_theme_mod( 'nav_menu_locations', $locations );
+
+	if ( $result && ! is_wp_error( $result ) ) {
+
+		/**
+		 * Fires after a navigation menu has been successfully deleted.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param int $term_id ID of the deleted menu.
+		 */
+		do_action( 'wp_delete_nav_menu', $menu->term_id );
+	}
+
+	return $result;
+}
+
+/**
+ * Saves the properties of a menu or create a new menu with those properties.
+ *
+ * Note that `$menu_data` is expected to be pre-slashed.
+ *
+ * @since 3.0.0
+ *
+ * @param int   $menu_id   The ID of the menu or "0" to create a new menu.
+ * @param array $menu_data The array of menu data.
+ * @return int|WP_Error Menu ID on success, WP_Error object on failure.
+ */
+function wp_update_nav_menu_object( $menu_id = 0, $menu_data = array() ) {
+	// expected_slashed ($menu_data)
+	$menu_id = (int) $menu_id;
+
+	$_menu = wp_get_nav_menu_object( $menu_id );
+
+	$args = array(
+		'description' => ( isset( $menu_data['description'] ) ? $menu_data['description'] : '' ),
+		'name'        => ( isset( $menu_data['menu-name'] ) ? $menu_data['menu-name'] : '' ),
+		'parent'      => ( isset( $menu_data['parent'] ) ? (int) $menu_data['parent'] : 0 ),
+		'slug'        => null,
+	);
+
+	// Double-check that we're not going to have one menu take the name of another.
+	$_possible_existing = get_term_by( 'name', $menu_data['menu-name'], 'nav_menu' );
+	if (
+		$_possible_existing &&
+		! is_wp_error( $_possible_existing ) &&
+		isset( $_possible_existing->term_id ) &&
+		$_possible_existing->term_id != $menu_id
+	) {
+		return new WP_Error(
+			'menu_exists',
+			sprintf(
+				/* translators: %s: Menu name. */
+				__( 'The menu name %s conflicts with another menu name. Please try another.' ),
+				'<strong>' . esc_html( $menu_data['menu-name'] ) . '</strong>'
+			)
+		);
+	}
+
+	// Menu doesn't already exist, so create a new menu.
+	if ( ! $_menu || is_wp_error( $_menu ) ) {
+		$menu_exists = get_term_by( 'name', $menu_data['menu-name'], 'nav_menu' );
+
+		if ( $menu_exists ) {
+			return new WP_Error(
+				'menu_exists',
+				sprintf(
+					/* translators: %s: Menu name. */
+					__( 'The menu name %s conflicts with another menu name. Please try another.' ),
+					'<strong>' . esc_html( $menu_data['menu-name'] ) . '</strong>'
+				)
+			);
+		}
+
+		$_menu = wp_insert_term( $menu_data['menu-name'], 'nav_menu', $args );
+
+		if ( is_wp_error( $_menu ) ) {
+			return $_menu;
+		}
+
+		/**
+		 * Fires after a navigation menu is successfully created.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param int   $term_id   ID of the new menu.
+		 * @param array $menu_data An array of menu data.
+		 */
+		do_action( 'wp_create_nav_menu', $_menu['term_id'], $menu_data );
+
+		return (int) $_menu['term_id'];
+	}
+
+	if ( ! $_menu || ! isset( $_menu->term_id ) ) {
+		return 0;
+	}
+
+	$menu_id = (int) $_menu->term_id;
+
+	$update_response = wp_update_term( $menu_id, 'nav_menu', $args );
+
+	if ( is_wp_error( $update_response ) ) {
+		return $update_response;
+	}
+
+	$menu_id = (int) $update_response['term_id'];
+
+	/**
+	 * Fires after a navigation menu has been successfully updated.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param int   $menu_id   ID of the updated menu.
+	 * @param array $menu_data An array of menu data.
+	 */
+	do_action( 'wp_update_nav_menu', $menu_id, $menu_data );
+	return $menu_id;
+}
+
+/**
+ * Saves the properties of a menu item or create a new one.
+ *
+ * The menu-item-title, menu-item-description and menu-item-attr-title are expected
+ * to be pre-slashed since they are passed directly to APIs that expect slashed data.
+ *
+ * @since 3.0.0
+ * @since 5.9.0 Added the `$fire_after_hooks` parameter.
+ *
+ * @param int   $menu_id          The ID of the menu. If 0, makes the menu item a draft orphan.
+ * @param int   $menu_item_db_id  The ID of the menu item. If 0, creates a new menu item.
+ * @param array $menu_item_data   The menu item's data.
+ * @param bool  $fire_after_hooks Whether to fire the after insert hooks. Default true.
+ * @return int|WP_Error The menu item's database ID or WP_Error object on failure.
+ */
+function wp_update_nav_menu_item( $menu_id = 0, $menu_item_db_id = 0, $menu_item_data = array(), $fire_after_hooks = true ) {
+	$menu_id         = (int) $menu_id;
+	$menu_item_db_id = (int) $menu_item_db_id;
+
+	// Make sure that we don't convert non-nav_menu_item objects into nav_menu_item objects.
+	if ( ! empty( $menu_item_db_id ) && ! is_nav_menu_item( $menu_item_db_id ) ) {
+		return new WP_Error( 'update_nav_menu_item_failed', __( 'The given object ID is not that of a menu item.' ) );
+	}
+
+	$menu = wp_get_nav_menu_object( $menu_id );
+
+	if ( ! $menu && 0 !== $menu_id ) {
+		return new WP_Error( 'invalid_menu_id', __( 'Invalid menu ID.' ) );
+	}
+
+	if ( is_wp_error( $menu ) ) {
+		return $menu;
+	}
+
+	$defaults = array(
+		'menu-item-db-id'         => $menu_item_db_id,
+		'menu-item-object-id'     => 0,
+		'menu-item-object'        => '',
+		'menu-item-parent-id'     => 0,
+		'menu-item-position'      => 0,
+		'menu-item-type'          => 'custom',
+		'menu-item-title'         => '',
+		'menu-item-url'           => '',
+		'menu-item-description'   => '',
+		'menu-item-attr-title'    => '',
+		'menu-item-target'        => '',
+		'menu-item-classes'       => '',
+		'menu-item-xfn'           => '',
+		'menu-item-status'        => '',
+		'menu-item-post-date'     => '',
+		'menu-item-post-date-gmt' => '',
+	);
+
+	$args = wp_parse_args( $menu_item_data, $defaults );
+
+	if ( 0 == $menu_id ) {
+		$args['menu-item-position'] = 1;
+	} elseif ( 0 == (int) $args['menu-item-position'] ) {
+		$menu_items                 = 0 == $menu_id ? array() : (array) wp_get_nav_menu_items( $menu_id, array( 'post_status' => 'publish,draft' ) );
+		$last_item                  = array_pop( $menu_items );
+		$args['menu-item-position'] = ( $last_item && isset( $last_item->menu_order ) ) ? 1 + $last_item->menu_order : count( $menu_items );
+	}
+
+	$original_parent = 0 < $menu_item_db_id ? get_post_field( 'post_parent', $menu_item_db_id ) : 0;
+
+	if ( 'custom' === $args['menu-item-type'] ) {
+		// If custom menu item, trim the URL.
+		$args['menu-item-url'] = trim( $args['menu-item-url'] );
+	} else {
+		/*
+		 * If non-custom menu item, then:
+		 * - use the original object's URL.
+		 * - blank default title to sync with the original object's title.
+		 */
+
+		$args['menu-item-url'] = '';
+
+		$original_title = '';
+		if ( 'taxonomy' === $args['menu-item-type'] ) {
+			$original_parent = get_term_field( 'parent', $args['menu-item-object-id'], $args['menu-item-object'], 'raw' );
+			$original_title  = get_term_field( 'name', $args['menu-item-object-id'], $args['menu-item-object'], 'raw' );
+		} elseif ( 'post_type' === $args['menu-item-type'] ) {
+
+			$original_object = get_post( $args['menu-item-object-id'] );
+			$original_parent = (int) $original_object->post_parent;
+			$original_title  = $original_object->post_title;
+		} elseif ( 'post_type_archive' === $args['menu-item-type'] ) {
+			$original_object = get_post_type_object( $args['menu-item-object'] );
+			if ( $original_object ) {
+				$original_title = $original_object->labels->archives;
+			}
+		}
+
+		if ( wp_unslash( $args['menu-item-title'] ) === wp_specialchars_decode( $original_title ) ) {
+			$args['menu-item-title'] = '';
+		}
+
+		// Hack to get wp to create a post object when too many properties are empty.
+		if ( '' === $args['menu-item-title'] && '' === $args['menu-item-description'] ) {
+			$args['menu-item-description'] = ' ';
+		}
+	}
+
+	// Populate the menu item object.
+	$post = array(
+		'menu_order'   => $args['menu-item-position'],
+		'ping_status'  => 0,
+		'post_content' => $args['menu-item-description'],
+		'post_excerpt' => $args['menu-item-attr-title'],
+		'post_parent'  => $original_parent,
+		'post_title'   => $args['menu-item-title'],
+		'post_type'    => 'nav_menu_item',
+	);
+
+	$post_date = wp_resolve_post_date( $args['menu-item-post-date'], $args['menu-item-post-date-gmt'] );
+	if ( $post_date ) {
+		$post['post_date'] = $post_date;
+	}
+
+	$update = 0 != $menu_item_db_id;
+
+	// New menu item. Default is draft status.
+	if ( ! $update ) {
+		$post['ID']          = 0;
+		$post['post_status'] = 'publish' === $args['menu-item-status'] ? 'publish' : 'draft';
+		$menu_item_db_id     = wp_insert_post( $post, true, $fire_after_hooks );
+		if ( ! $menu_item_db_id || is_wp_error( $menu_item_db_id ) ) {
+			return $menu_item_db_id;
+		}
+
+		/**
+		 * Fires immediately after a new navigation menu item has been added.
+		 *
+		 * @since 4.4.0
+		 *
+		 * @see wp_update_nav_menu_item()
+		 *
+		 * @param int   $menu_id         ID of the updated menu.
+		 * @param int   $menu_item_db_id ID of the new menu item.
+		 * @param array $args            An array of arguments used to update/add the menu item.
+		 */
+		do_action( 'wp_add_nav_menu_item', $menu_id, $menu_item_db_id, $args );
+	}
+
+	/*
+	 * Associate the menu item with the menu term.
+	 * Only set the menu term if it isn't set to avoid unnecessary wp_get_object_terms().
+	 */
+	if ( $menu_id && ( ! $update || ! is_object_in_term( $menu_item_db_id, 'nav_menu', (int) $menu->term_id ) ) ) {
+		$update_terms = wp_set_object_terms( $menu_item_db_id, array( $menu->term_id ), 'nav_menu' );
+		if ( is_wp_error( $update_terms ) ) {
+			return $update_terms;
+		}
+	}
+
+	if ( 'custom' === $args['menu-item-type'] ) {
+		$args['menu-item-object-id'] = $menu_item_db_id;
+		$args['menu-item-object']    = 'custom';
+	}
+
+	$menu_item_db_id = (int) $menu_item_db_id;
+
+	// Reset invalid `menu_item_parent`.
+	if ( (int) $args['menu-item-parent-id'] === $menu_item_db_id ) {
+		$args['menu-item-parent-id'] = 0;
+	}
+
+	update_post_meta( $menu_item_db_id, '_menu_item_type', sanitize_key( $args['menu-item-type'] ) );
+	update_post_meta( $menu_item_db_id, '_menu_item_menu_item_parent', (string) ( (int) $args['menu-item-parent-id'] ) );
+	update_post_meta( $menu_item_db_id, '_menu_item_object_id', (string) ( (int) $args['menu-item-object-id'] ) );
+	update_post_meta( $menu_item_db_id, '_menu_item_object', sanitize_key( $args['menu-item-object'] ) );
+	update_post_meta( $menu_item_db_id, '_menu_item_target', sanitize_key( $args['menu-item-target'] ) );
+
+	$args['menu-item-classes'] = array_map( 'sanitize_html_class', explode( ' ', $args['menu-item-classes'] ) );
+	$args['menu-item-xfn']     = implode( ' ', array_map( 'sanitize_html_class', explode( ' ', $args['menu-item-xfn'] ) ) );
+	update_post_meta( $menu_item_db_id, '_menu_item_classes', $args['menu-item-classes'] );
+	update_post_meta( $menu_item_db_id, '_menu_item_xfn', $args['menu-item-xfn'] );
+	update_post_meta( $menu_item_db_id, '_menu_item_url', sanitize_url( $args['menu-item-url'] ) );
+
+	if ( 0 == $menu_id ) {
+		update_post_meta( $menu_item_db_id, '_menu_item_orphaned', (string) time() );
+	} elseif ( get_post_meta( $menu_item_db_id, '_menu_item_orphaned' ) ) {
+		delete_post_meta( $menu_item_db_id, '_menu_item_orphaned' );
+	}
+
+	// Update existing menu item. Default is publish status.
+	if ( $update ) {
+		$post['ID']          = $menu_item_db_id;
+		$post['post_status'] = ( 'draft' === $args['menu-item-status'] ) ? 'draft' : 'publish';
+
+		$update_post = wp_update_post( $post, true );
+		if ( is_wp_error( $update_post ) ) {
+			return $update_post;
+		}
+	}
+
+	/**
+	 * Fires after a navigation menu item has been updated.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see wp_update_nav_menu_item()
+	 *
+	 * @param int   $menu_id         ID of the updated menu.
+	 * @param int   $menu_item_db_id ID of the updated menu item.
+	 * @param array $args            An array of arguments used to update a menu item.
+	 */
+	do_action( 'wp_update_nav_menu_item', $menu_id, $menu_item_db_id, $args );
+
+	return $menu_item_db_id;
+}
+
+/**
+ * Returns all navigation menu objects.
+ *
+ * @since 3.0.0
+ * @since 4.1.0 Default value of the 'orderby' argument was changed from 'none'
+ *              to 'name'.
+ *
+ * @param array $args Optional. Array of arguments passed on to get_terms().
+ *                    Default empty array.
+ * @return WP_Term[] An array of menu objects.
+ */
+function wp_get_nav_menus( $args = array() ) {
+	$defaults = array(
+		'taxonomy'   => 'nav_menu',
+		'hide_empty' => false,
+		'orderby'    => 'name',
+	);
+	$args     = wp_parse_args( $args, $defaults );
+
+	/**
+	 * Filters the navigation menu objects being returned.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see get_terms()
+	 *
+	 * @param WP_Term[] $menus An array of menu objects.
+	 * @param array     $args  An array of arguments used to retrieve menu objects.
+	 */
+	return apply_filters( 'wp_get_nav_menus', get_terms( $args ), $args );
+}
+
+/**
+ * Determines whether a menu item is valid.
+ *
+ * @link https://core.trac.wordpress.org/ticket/13958
+ *
+ * @since 3.2.0
+ * @access private
+ *
+ * @param object $item The menu item to check.
+ * @return bool False if invalid, otherwise true.
+ */
+function _is_valid_nav_menu_item( $item ) {
+	return empty( $item->_invalid );
+}
+
+/**
+ * Retrieves all menu items of a navigation menu.
+ *
+ * Note: Most arguments passed to the `$args` parameter – save for 'output_key' – are
+ * specifically for retrieving nav_menu_item posts from get_posts() and may only
+ * indirectly affect the ultimate ordering and content of the resulting nav menu
+ * items that get returned from this function.
+ *
+ * @since 3.0.0
+ *
+ * @param int|string|WP_Term $menu Menu ID, slug, name, or object.
+ * @param array              $args {
+ *     Optional. Arguments to pass to get_posts().
+ *
+ *     @type string $order                  How to order nav menu items as queried with get_posts().
+ *                                          Will be ignored if 'output' is ARRAY_A. Default 'ASC'.
+ *     @type string $orderby                Field to order menu items by as retrieved from get_posts().
+ *                                          Supply an orderby field via 'output_key' to affect the
+ *                                          output order of nav menu items. Default 'menu_order'.
+ *     @type string $post_type              Menu items post type. Default 'nav_menu_item'.
+ *     @type string $post_status            Menu items post status. Default 'publish'.
+ *     @type string $output                 How to order outputted menu items. Default ARRAY_A.
+ *     @type string $output_key             Key to use for ordering the actual menu items that get
+ *                                          returned. Note that that is not a get_posts() argument
+ *                                          and will only affect output of menu items processed in
+ *                                          this function. Default 'menu_order'.
+ *     @type bool   $nopaging               Whether to retrieve all menu items (true) or paginate
+ *                                          (false). Default true.
+ *     @type bool   $update_menu_item_cache Whether to update the menu item cache. Default true.
+ * }
+ * @return array|false Array of menu items, otherwise false.
+ */
+function wp_get_nav_menu_items( $menu, $args = array() ) {
+	$menu = wp_get_nav_menu_object( $menu );
+
+	if ( ! $menu ) {
+		return false;
+	}
+
+	if ( ! taxonomy_exists( 'nav_menu' ) ) {
+		return false;
+	}
+
+	$defaults = array(
+		'order'                  => 'ASC',
+		'orderby'                => 'menu_order',
+		'post_type'              => 'nav_menu_item',
+		'post_status'            => 'publish',
+		'output'                 => ARRAY_A,
+		'output_key'             => 'menu_order',
+		'nopaging'               => true,
+		'update_menu_item_cache' => true,
+		'tax_query'              => array(
+			array(
+				'taxonomy' => 'nav_menu',
+				'field'    => 'term_taxonomy_id',
+				'terms'    => $menu->term_taxonomy_id,
+			),
+		),
+	);
+	$args     = wp_parse_args( $args, $defaults );
+	if ( $menu->count > 0 ) {
+		$items = get_posts( $args );
+	} else {
+		$items = array();
+	}
+
+	$items = array_map( 'wp_setup_nav_menu_item', $items );
+
+	if ( ! is_admin() ) { // Remove invalid items only on front end.
+		$items = array_filter( $items, '_is_valid_nav_menu_item' );
+	}
+
+	if ( ARRAY_A === $args['output'] ) {
+		$items = wp_list_sort(
+			$items,
+			array(
+				$args['output_key'] => 'ASC',
+			)
+		);
+
+		$i = 1;
+
+		foreach ( $items as $k => $item ) {
+			$items[ $k ]->{$args['output_key']} = $i++;
+		}
+	}
+
+	/**
+	 * Filters the navigation menu items being returned.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array  $items An array of menu item post objects.
+	 * @param object $menu  The menu object.
+	 * @param array  $args  An array of arguments used to retrieve menu item objects.
+	 */
+	return apply_filters( 'wp_get_nav_menu_items', $items, $menu, $args );
+}
+
+/**
+ * Updates post and term caches for all linked objects for a list of menu items.
+ *
+ * @since 6.1.0
+ *
+ * @param WP_Post[] $menu_items Array of menu item post objects.
+ */
+function update_menu_item_cache( $menu_items ) {
+	$post_ids = array();
+	$term_ids = array();
+
+	foreach ( $menu_items as $menu_item ) {
+		if ( 'nav_menu_item' !== $menu_item->post_type ) {
+			continue;
+		}
+
+		$object_id = get_post_meta( $menu_item->ID, '_menu_item_object_id', true );
+		$type      = get_post_meta( $menu_item->ID, '_menu_item_type', true );
+
+		if ( 'post_type' === $type ) {
+			$post_ids[] = (int) $object_id;
+		} elseif ( 'taxonomy' === $type ) {
+			$term_ids[] = (int) $object_id;
+		}
+	}
+
+	if ( ! empty( $post_ids ) ) {
+		_prime_post_caches( $post_ids, false );
+	}
+
+	if ( ! empty( $term_ids ) ) {
+		_prime_term_caches( $term_ids );
+	}
+}
+
+/**
+ * Decorates a menu item object with the shared navigation menu item properties.
+ *
+ * Properties:
+ * - ID:               The term_id if the menu item represents a taxonomy term.
+ * - attr_title:       The title attribute of the link element for this menu item.
+ * - classes:          The array of class attribute values for the link element of this menu item.
+ * - db_id:            The DB ID of this item as a nav_menu_item object, if it exists (0 if it doesn't exist).
+ * - description:      The description of this menu item.
+ * - menu_item_parent: The DB ID of the nav_menu_item that is this item's menu parent, if any. 0 otherwise.
+ * - object:           The type of object originally represented, such as 'category', 'post', or 'attachment'.
+ * - object_id:        The DB ID of the original object this menu item represents, e.g. ID for posts and term_id for categories.
+ * - post_parent:      The DB ID of the original object's parent object, if any (0 otherwise).
+ * - post_title:       A "no title" label if menu item represents a post that lacks a title.
+ * - target:           The target attribute of the link element for this menu item.
+ * - title:            The title of this menu item.
+ * - type:             The family of objects originally represented, such as 'post_type' or 'taxonomy'.
+ * - type_label:       The singular label used to describe this type of menu item.
+ * - url:              The URL to which this menu item points.
+ * - xfn:              The XFN relationship expressed in the link of this menu item.
+ * - _invalid:         Whether the menu item represents an object that no longer exists.
+ *
+ * @since 3.0.0
+ *
+ * @param object $menu_item The menu item to modify.
+ * @return object The menu item with standard menu item properties.
+ */
+function wp_setup_nav_menu_item( $menu_item ) {
+
+	/**
+	 * Filters whether to short-circuit the wp_setup_nav_menu_item() output.
+	 *
+	 * Returning a non-null value from the filter will short-circuit wp_setup_nav_menu_item(),
+	 * returning that value instead.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @param object|null $modified_menu_item Modified menu item. Default null.
+	 * @param object      $menu_item          The menu item to modify.
+	 */
+	$pre_menu_item = apply_filters( 'pre_wp_setup_nav_menu_item', null, $menu_item );
+
+	if ( null !== $pre_menu_item ) {
+		return $pre_menu_item;
+	}
+
+	if ( isset( $menu_item->post_type ) ) {
+		if ( 'nav_menu_item' === $menu_item->post_type ) {
+			$menu_item->db_id            = (int) $menu_item->ID;
+			$menu_item->menu_item_parent = ! isset( $menu_item->menu_item_parent ) ? get_post_meta( $menu_item->ID, '_menu_item_menu_item_parent', true ) : $menu_item->menu_item_parent;
+			$menu_item->object_id        = ! isset( $menu_item->object_id ) ? get_post_meta( $menu_item->ID, '_menu_item_object_id', true ) : $menu_item->object_id;
+			$menu_item->object           = ! isset( $menu_item->object ) ? get_post_meta( $menu_item->ID, '_menu_item_object', true ) : $menu_item->object;
+			$menu_item->type             = ! isset( $menu_item->type ) ? get_post_meta( $menu_item->ID, '_menu_item_type', true ) : $menu_item->type;
+
+			if ( 'post_type' === $menu_item->type ) {
+				$object = get_post_type_object( $menu_item->object );
+				if ( $object ) {
+					$menu_item->type_label = $object->labels->singular_name;
+					// Denote post states for special pages (only in the admin).
+					if ( function_exists( 'get_post_states' ) ) {
+						$menu_post   = get_post( $menu_item->object_id );
+						$post_states = get_post_states( $menu_post );
+						if ( $post_states ) {
+							$menu_item->type_label = wp_strip_all_tags( implode( ', ', $post_states ) );
+						}
+					}
+				} else {
+					$menu_item->type_label = $menu_item->object;
+					$menu_item->_invalid   = true;
+				}
+
+				if ( 'trash' === get_post_status( $menu_item->object_id ) ) {
+					$menu_item->_invalid = true;
+				}
+
+				$original_object = get_post( $menu_item->object_id );
+
+				if ( $original_object ) {
+					$menu_item->url = get_permalink( $original_object->ID );
+					/** This filter is documented in wp-includes/post-template.php */
+					$original_title = apply_filters( 'the_title', $original_object->post_title, $original_object->ID );
+				} else {
+					$menu_item->url      = '';
+					$original_title      = '';
+					$menu_item->_invalid = true;
+				}
+
+				if ( '' === $original_title ) {
+					/* translators: %d: ID of a post. */
+					$original_title = sprintf( __( '#%d (no title)' ), $menu_item->object_id );
+				}
+
+				$menu_item->title = ( '' === $menu_item->post_title ) ? $original_title : $menu_item->post_title;
+
+			} elseif ( 'post_type_archive' === $menu_item->type ) {
+				$object = get_post_type_object( $menu_item->object );
+				if ( $object ) {
+					$menu_item->title      = ( '' === $menu_item->post_title ) ? $object->labels->archives : $menu_item->post_title;
+					$post_type_description = $object->description;
+				} else {
+					$post_type_description = '';
+					$menu_item->_invalid   = true;
+				}
+
+				$menu_item->type_label = __( 'Post Type Archive' );
+				$post_content          = wp_trim_words( $menu_item->post_content, 200 );
+				$post_type_description = ( '' === $post_content ) ? $post_type_description : $post_content;
+				$menu_item->url        = get_post_type_archive_link( $menu_item->object );
+
+			} elseif ( 'taxonomy' === $menu_item->type ) {
+				$object = get_taxonomy( $menu_item->object );
+				if ( $object ) {
+					$menu_item->type_label = $object->labels->singular_name;
+				} else {
+					$menu_item->type_label = $menu_item->object;
+					$menu_item->_invalid   = true;
+				}
+
+				$original_object = get_term( (int) $menu_item->object_id, $menu_item->object );
+
+				if ( $original_object && ! is_wp_error( $original_object ) ) {
+					$menu_item->url = get_term_link( (int) $menu_item->object_id, $menu_item->object );
+					$original_title = $original_object->name;
+				} else {
+					$menu_item->url      = '';
+					$original_title      = '';
+					$menu_item->_invalid = true;
+				}
+
+				if ( '' === $original_title ) {
+					/* translators: %d: ID of a term. */
+					$original_title = sprintf( __( '#%d (no title)' ), $menu_item->object_id );
+				}
+
+				$menu_item->title = ( '' === $menu_item->post_title ) ? $original_title : $menu_item->post_title;
+
+			} else {
+				$menu_item->type_label = __( 'Custom Link' );
+				$menu_item->title      = $menu_item->post_title;
+				$menu_item->url        = ! isset( $menu_item->url ) ? get_post_meta( $menu_item->ID, '_menu_item_url', true ) : $menu_item->url;
+			}
+
+			$menu_item->target = ! isset( $menu_item->target ) ? get_post_meta( $menu_item->ID, '_menu_item_target', true ) : $menu_item->target;
+
+			/**
+			 * Filters a navigation menu item's title attribute.
+			 *
+			 * @since 3.0.0
+			 *
+			 * @param string $item_title The menu item title attribute.
+			 */
+			$menu_item->attr_title = ! isset( $menu_item->attr_title ) ? apply_filters( 'nav_menu_attr_title', $menu_item->post_excerpt ) : $menu_item->attr_title;
+
+			if ( ! isset( $menu_item->description ) ) {
+				/**
+				 * Filters a navigation menu item's description.
+				 *
+				 * @since 3.0.0
+				 *
+				 * @param string $description The menu item description.
+				 */
+				$menu_item->description = apply_filters( 'nav_menu_description', wp_trim_words( $menu_item->post_content, 200 ) );
+			}
+
+			$menu_item->classes = ! isset( $menu_item->classes ) ? (array) get_post_meta( $menu_item->ID, '_menu_item_classes', true ) : $menu_item->classes;
+			$menu_item->xfn     = ! isset( $menu_item->xfn ) ? get_post_meta( $menu_item->ID, '_menu_item_xfn', true ) : $menu_item->xfn;
+		} else {
+			$menu_item->db_id            = 0;
+			$menu_item->menu_item_parent = 0;
+			$menu_item->object_id        = (int) $menu_item->ID;
+			$menu_item->type             = 'post_type';
+
+			$object                = get_post_type_object( $menu_item->post_type );
+			$menu_item->object     = $object->name;
+			$menu_item->type_label = $object->labels->singular_name;
+
+			if ( '' === $menu_item->post_title ) {
+				/* translators: %d: ID of a post. */
+				$menu_item->post_title = sprintf( __( '#%d (no title)' ), $menu_item->ID );
+			}
+
+			$menu_item->title  = $menu_item->post_title;
+			$menu_item->url    = get_permalink( $menu_item->ID );
+			$menu_item->target = '';
+
+			/** This filter is documented in wp-includes/nav-menu.php */
+			$menu_item->attr_title = apply_filters( 'nav_menu_attr_title', '' );
+
+			/** This filter is documented in wp-includes/nav-menu.php */
+			$menu_item->description = apply_filters( 'nav_menu_description', '' );
+			$menu_item->classes     = array();
+			$menu_item->xfn         = '';
+		}
+	} elseif ( isset( $menu_item->taxonomy ) ) {
+		$menu_item->ID               = $menu_item->term_id;
+		$menu_item->db_id            = 0;
+		$menu_item->menu_item_parent = 0;
+		$menu_item->object_id        = (int) $menu_item->term_id;
+		$menu_item->post_parent      = (int) $menu_item->parent;
+		$menu_item->type             = 'taxonomy';
+
+		$object                = get_taxonomy( $menu_item->taxonomy );
+		$menu_item->object     = $object->name;
+		$menu_item->type_label = $object->labels->singular_name;
+
+		$menu_item->title       = $menu_item->name;
+		$menu_item->url         = get_term_link( $menu_item, $menu_item->taxonomy );
+		$menu_item->target      = '';
+		$menu_item->attr_title  = '';
+		$menu_item->description = get_term_field( 'description', $menu_item->term_id, $menu_item->taxonomy );
+		$menu_item->classes     = array();
+		$menu_item->xfn         = '';
+
+	}
+
+	/**
+	 * Filters a navigation menu item object.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param object $menu_item The menu item object.
+	 */
+	return apply_filters( 'wp_setup_nav_menu_item', $menu_item );
+}
+
+/**
+ * Returns the menu items associated with a particular object.
+ *
+ * @since 3.0.0
+ *
+ * @param int    $object_id   Optional. The ID of the original object. Default 0.
+ * @param string $object_type Optional. The type of object, such as 'post_type' or 'taxonomy'.
+ *                            Default 'post_type'.
+ * @param string $taxonomy    Optional. If $object_type is 'taxonomy', $taxonomy is the name
+ *                            of the tax that $object_id belongs to. Default empty.
+ * @return int[] The array of menu item IDs; empty array if none.
+ */
+function wp_get_associated_nav_menu_items( $object_id = 0, $object_type = 'post_type', $taxonomy = '' ) {
+	$object_id     = (int) $object_id;
+	$menu_item_ids = array();
+
+	$query      = new WP_Query();
+	$menu_items = $query->query(
+		array(
+			'meta_key'       => '_menu_item_object_id',
+			'meta_value'     => $object_id,
+			'post_status'    => 'any',
+			'post_type'      => 'nav_menu_item',
+			'posts_per_page' => -1,
+		)
+	);
+	foreach ( (array) $menu_items as $menu_item ) {
+		if ( isset( $menu_item->ID ) && is_nav_menu_item( $menu_item->ID ) ) {
+			$menu_item_type = get_post_meta( $menu_item->ID, '_menu_item_type', true );
+			if (
+				'post_type' === $object_type &&
+				'post_type' === $menu_item_type
+			) {
+				$menu_item_ids[] = (int) $menu_item->ID;
+			} elseif (
+				'taxonomy' === $object_type &&
+				'taxonomy' === $menu_item_type &&
+				get_post_meta( $menu_item->ID, '_menu_item_object', true ) == $taxonomy
+			) {
+				$menu_item_ids[] = (int) $menu_item->ID;
+			}
+		}
+	}
+
+	return array_unique( $menu_item_ids );
+}
+
+/**
+ * Callback for handling a menu item when its original object is deleted.
+ *
+ * @since 3.0.0
+ * @access private
+ *
+ * @param int $object_id The ID of the original object being trashed.
+ */
+function _wp_delete_post_menu_item( $object_id ) {
+	$object_id = (int) $object_id;
+
+	$menu_item_ids = wp_get_associated_nav_menu_items( $object_id, 'post_type' );
+
+	foreach ( (array) $menu_item_ids as $menu_item_id ) {
+		wp_delete_post( $menu_item_id, true );
+	}
+}
+
+/**
+ * Serves as a callback for handling a menu item when its original object is deleted.
+ *
+ * @since 3.0.0
+ * @access private
+ *
+ * @param int    $object_id The ID of the original object being trashed.
+ * @param int    $tt_id     Term taxonomy ID. Unused.
+ * @param string $taxonomy  Taxonomy slug.
+ */
+function _wp_delete_tax_menu_item( $object_id, $tt_id, $taxonomy ) {
+	$object_id = (int) $object_id;
+
+	$menu_item_ids = wp_get_associated_nav_menu_items( $object_id, 'taxonomy', $taxonomy );
+
+	foreach ( (array) $menu_item_ids as $menu_item_id ) {
+		wp_delete_post( $menu_item_id, true );
+	}
+}
+
+/**
+ * Automatically add newly published page objects to menus with that as an option.
+ *
+ * @since 3.0.0
+ * @access private
+ *
+ * @param string  $new_status The new status of the post object.
+ * @param string  $old_status The old status of the post object.
+ * @param WP_Post $post       The post object being transitioned from one status to another.
+ */
+function _wp_auto_add_pages_to_menu( $new_status, $old_status, $post ) {
+	if ( 'publish' !== $new_status || 'publish' === $old_status || 'page' !== $post->post_type ) {
+		return;
+	}
+	if ( ! empty( $post->post_parent ) ) {
+		return;
+	}
+	$auto_add = get_option( 'nav_menu_options' );
+	if ( empty( $auto_add ) || ! is_array( $auto_add ) || ! isset( $auto_add['auto_add'] ) ) {
+		return;
+	}
+	$auto_add = $auto_add['auto_add'];
+	if ( empty( $auto_add ) || ! is_array( $auto_add ) ) {
+		return;
+	}
+
+	$args = array(
+		'menu-item-object-id' => $post->ID,
+		'menu-item-object'    => $post->post_type,
+		'menu-item-type'      => 'post_type',
+		'menu-item-status'    => 'publish',
+	);
+
+	foreach ( $auto_add as $menu_id ) {
+		$items = wp_get_nav_menu_items( $menu_id, array( 'post_status' => 'publish,draft' ) );
+		if ( ! is_array( $items ) ) {
+			continue;
+		}
+		foreach ( $items as $item ) {
+			if ( $post->ID == $item->object_id ) {
+				continue 2;
+			}
+		}
+		wp_update_nav_menu_item( $menu_id, 0, $args );
+	}
+}
+
+/**
+ * Deletes auto-draft posts associated with the supplied changeset.
+ *
+ * @since 4.8.0
+ * @access private
+ *
+ * @param int $post_id Post ID for the customize_changeset.
+ */
+function _wp_delete_customize_changeset_dependent_auto_drafts( $post_id ) {
+	$post = get_post( $post_id );
+
+	if ( ! $post || 'customize_changeset' !== $post->post_type ) {
+		return;
+	}
+
+	$data = json_decode( $post->post_content, true );
+	if ( empty( $data['nav_menus_created_posts']['value'] ) ) {
+		return;
+	}
+	remove_action( 'delete_post', '_wp_delete_customize_changeset_dependent_auto_drafts' );
+	foreach ( $data['nav_menus_created_posts']['value'] as $stub_post_id ) {
+		if ( empty( $stub_post_id ) ) {
+			continue;
+		}
+		if ( 'auto-draft' === get_post_status( $stub_post_id ) ) {
+			wp_delete_post( $stub_post_id, true );
+		} elseif ( 'draft' === get_post_status( $stub_post_id ) ) {
+			wp_trash_post( $stub_post_id );
+			delete_post_meta( $stub_post_id, '_customize_changeset_uuid' );
+		}
+	}
+	add_action( 'delete_post', '_wp_delete_customize_changeset_dependent_auto_drafts' );
+}
+
+/**
+ * Handles menu config after theme change.
+ *
+ * @access private
+ * @since 4.9.0
+ */
+function _wp_menus_changed() {
+	$old_nav_menu_locations    = get_option( 'theme_switch_menu_locations', array() );
+	$new_nav_menu_locations    = get_nav_menu_locations();
+	$mapped_nav_menu_locations = wp_map_nav_menu_locations( $new_nav_menu_locations, $old_nav_menu_locations );
+
+	set_theme_mod( 'nav_menu_locations', $mapped_nav_menu_locations );
+	delete_option( 'theme_switch_menu_locations' );
+}
+
+/**
+ * Maps nav menu locations according to assignments in previously active theme.
+ *
+ * @since 4.9.0
+ *
+ * @param array $new_nav_menu_locations New nav menu locations assignments.
+ * @param array $old_nav_menu_locations Old nav menu locations assignments.
+ * @return array Nav menus mapped to new nav menu locations.
+ */
+function wp_map_nav_menu_locations( $new_nav_menu_locations, $old_nav_menu_locations ) {
+	$registered_nav_menus   = get_registered_nav_menus();
+	$new_nav_menu_locations = array_intersect_key( $new_nav_menu_locations, $registered_nav_menus );
+
+	// Short-circuit if there are no old nav menu location assignments to map.
+	if ( empty( $old_nav_menu_locations ) ) {
+		return $new_nav_menu_locations;
+	}
+
+	// If old and new theme have just one location, map it and we're done.
+	if ( 1 === count( $old_nav_menu_locations ) && 1 === count( $registered_nav_menus ) ) {
+		$new_nav_menu_locations[ key( $registered_nav_menus ) ] = array_pop( $old_nav_menu_locations );
+		return $new_nav_menu_locations;
+	}
+
+	$old_locations = array_keys( $old_nav_menu_locations );
+
+	// Map locations with the same slug.
+	foreach ( $registered_nav_menus as $location => $name ) {
+		if ( in_array( $location, $old_locations, true ) ) {
+			$new_nav_menu_locations[ $location ] = $old_nav_menu_locations[ $location ];
+			unset( $old_nav_menu_locations[ $location ] );
+		}
+	}
+
+	// If there are no old nav menu locations left, then we're done.
+	if ( empty( $old_nav_menu_locations ) ) {
+		return $new_nav_menu_locations;
+	}
+
+	/*
+	 * If old and new theme both have locations that contain phrases
+	 * from within the same group, make an educated guess and map it.
+	 */
+	$common_slug_groups = array(
+		array( 'primary', 'menu-1', 'main', 'header', 'navigation', 'top' ),
+		array( 'secondary', 'menu-2', 'footer', 'subsidiary', 'bottom' ),
+		array( 'social' ),
+	);
+
+	// Go through each group...
+	foreach ( $common_slug_groups as $slug_group ) {
+
+		// ...and see if any of these slugs...
+		foreach ( $slug_group as $slug ) {
+
+			// ...and any of the new menu locations...
+			foreach ( $registered_nav_menus as $new_location => $name ) {
+
+				// ...actually match!
+				if ( is_string( $new_location ) && false === stripos( $new_location, $slug ) && false === stripos( $slug, $new_location ) ) {
+					continue;
+				} elseif ( is_numeric( $new_location ) && $new_location !== $slug ) {
+					continue;
+				}
+
+				// Then see if any of the old locations...
+				foreach ( $old_nav_menu_locations as $location => $menu_id ) {
+
+					// ...and any slug in the same group...
+					foreach ( $slug_group as $slug ) {
+
+						// ... have a match as well.
+						if ( is_string( $location ) && false === stripos( $location, $slug ) && false === stripos( $slug, $location ) ) {
+							continue;
+						} elseif ( is_numeric( $location ) && $location !== $slug ) {
+							continue;
+						}
+
+						// Make sure this location wasn't mapped and removed previously.
+						if ( ! empty( $old_nav_menu_locations[ $location ] ) ) {
+
+							// We have a match that can be mapped!
+							$new_nav_menu_locations[ $new_location ] = $old_nav_menu_locations[ $location ];
+
+							// Remove the mapped location so it can't be mapped again.
+							unset( $old_nav_menu_locations[ $location ] );
+
+							// Go back and check the next new menu location.
+							continue 3;
+						}
+					} // End foreach ( $slug_group as $slug ).
+				} // End foreach ( $old_nav_menu_locations as $location => $menu_id ).
+			} // End foreach foreach ( $registered_nav_menus as $new_location => $name ).
+		} // End foreach ( $slug_group as $slug ).
+	} // End foreach ( $common_slug_groups as $slug_group ).
+
+	return $new_nav_menu_locations;
+}
+
+/**
+ * Prevents menu items from being their own parent.
+ *
+ * Resets menu_item_parent to 0 when the parent is set to the item itself.
+ * For use before saving `_menu_item_menu_item_parent` in nav-menus.php.
+ *
+ * @since 6.2.0
+ * @access private
+ *
+ * @param array $menu_item_data The menu item data array.
+ * @return array The menu item data with reset menu_item_parent.
+ */
+function _wp_reset_invalid_menu_item_parent( $menu_item_data ) {
+	if ( ! is_array( $menu_item_data ) ) {
+		return $menu_item_data;
+	}
+
+	if (
+		! empty( $menu_item_data['ID'] ) &&
+		! empty( $menu_item_data['menu_item_parent'] ) &&
+		(int) $menu_item_data['ID'] === (int) $menu_item_data['menu_item_parent']
+	) {
+		$menu_item_data['menu_item_parent'] = 0;
+	}
+
+	return $menu_item_data;
+}