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/**
 * 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&#039;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 &amp;&amp; ! $menu_obj ) {
		$menu_obj = get_term( $menu, &#039;nav_menu&#039; );

		if ( ! $menu_obj ) {
			$menu_obj = get_term_by( &#039;slug&#039;, $menu, &#039;nav_menu&#039; );
		}

		if ( ! $menu_obj ) {
			$menu_obj = get_term_by( &#039;name&#039;, $menu, &#039;nav_menu&#039; );
		}
	}

	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( &#039;wp_get_nav_menu_object&#039;, $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 &amp;&amp;
		! is_wp_error( $menu_obj ) &amp;&amp;
		! empty( $menu_obj-&gt;taxonomy ) &amp;&amp;
		&#039;nav_menu&#039; === $menu_obj-&gt;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( &#039;menus&#039; );

	foreach ( $locations as $key =&gt; $value ) {
		if ( is_int( $key ) ) {
			_doing_it_wrong( __FUNCTION__, __( &#039;Nav menu locations must be strings.&#039; ), &#039;5.3.0&#039; );
			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 ) &amp;&amp; isset( $_wp_registered_nav_menus[ $location ] ) ) {
		unset( $_wp_registered_nav_menus[ $location ] );
		if ( empty( $_wp_registered_nav_menus ) ) {
			_remove_theme_support( &#039;menus&#039; );
		}
		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 =&gt; $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( &#039;nav_menu_locations&#039; );
	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( &#039;has_nav_menu&#039;, $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 = &#039;&#039;;

	$locations = get_nav_menu_locations();

	if ( isset( $locations[ $location ] ) ) {
		$menu = wp_get_nav_menu_object( $locations[ $location ] );

		if ( $menu &amp;&amp; $menu-&gt;name ) {
			$menu_name = $menu-&gt;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( &#039;wp_get_nav_menu_name&#039;, $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 ) &amp;&amp; ( &#039;nav_menu_item&#039; === 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( &#039;menu-name&#039; =&gt; $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-&gt;term_id, &#039;nav_menu&#039; );
	if ( ! empty( $menu_objects ) ) {
		foreach ( $menu_objects as $item ) {
			wp_delete_post( $item );
		}
	}

	$result = wp_delete_term( $menu-&gt;term_id, &#039;nav_menu&#039; );

	// Remove this menu from any locations.
	$locations = get_nav_menu_locations();
	foreach ( $locations as $location =&gt; $menu_id ) {
		if ( $menu_id == $menu-&gt;term_id ) {
			$locations[ $location ] = 0;
		}
	}
	set_theme_mod( &#039;nav_menu_locations&#039;, $locations );

	if ( $result &amp;&amp; ! 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( &#039;wp_delete_nav_menu&#039;, $menu-&gt;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 &quot;0&quot; 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(
		&#039;description&#039; =&gt; ( isset( $menu_data[&#039;description&#039;] ) ? $menu_data[&#039;description&#039;] : &#039;&#039; ),
		&#039;name&#039;        =&gt; ( isset( $menu_data[&#039;menu-name&#039;] ) ? $menu_data[&#039;menu-name&#039;] : &#039;&#039; ),
		&#039;parent&#039;      =&gt; ( isset( $menu_data[&#039;parent&#039;] ) ? (int) $menu_data[&#039;parent&#039;] : 0 ),
		&#039;slug&#039;        =&gt; null,
	);

	// Double-check that we&#039;re not going to have one menu take the name of another.
	$_possible_existing = get_term_by( &#039;name&#039;, $menu_data[&#039;menu-name&#039;], &#039;nav_menu&#039; );
	if (
		$_possible_existing &amp;&amp;
		! is_wp_error( $_possible_existing ) &amp;&amp;
		isset( $_possible_existing-&gt;term_id ) &amp;&amp;
		$_possible_existing-&gt;term_id != $menu_id
	) {
		return new WP_Error(
			&#039;menu_exists&#039;,
			sprintf(
				/* translators: %s: Menu name. */
				__( &#039;The menu name %s conflicts with another menu name. Please try another.&#039; ),
				&#039;&lt;strong&gt;&#039; . esc_html( $menu_data[&#039;menu-name&#039;] ) . &#039;&lt;/strong&gt;&#039;
			)
		);
	}

	// Menu doesn&#039;t already exist, so create a new menu.
	if ( ! $_menu || is_wp_error( $_menu ) ) {
		$menu_exists = get_term_by( &#039;name&#039;, $menu_data[&#039;menu-name&#039;], &#039;nav_menu&#039; );

		if ( $menu_exists ) {
			return new WP_Error(
				&#039;menu_exists&#039;,
				sprintf(
					/* translators: %s: Menu name. */
					__( &#039;The menu name %s conflicts with another menu name. Please try another.&#039; ),
					&#039;&lt;strong&gt;&#039; . esc_html( $menu_data[&#039;menu-name&#039;] ) . &#039;&lt;/strong&gt;&#039;
				)
			);
		}

		$_menu = wp_insert_term( $menu_data[&#039;menu-name&#039;], &#039;nav_menu&#039;, $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( &#039;wp_create_nav_menu&#039;, $_menu[&#039;term_id&#039;], $menu_data );

		return (int) $_menu[&#039;term_id&#039;];
	}

	if ( ! $_menu || ! isset( $_menu-&gt;term_id ) ) {
		return 0;
	}

	$menu_id = (int) $_menu-&gt;term_id;

	$update_response = wp_update_term( $menu_id, &#039;nav_menu&#039;, $args );

	if ( is_wp_error( $update_response ) ) {
		return $update_response;
	}

	$menu_id = (int) $update_response[&#039;term_id&#039;];

	/**
	 * 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( &#039;wp_update_nav_menu&#039;, $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&#039;s data.
 * @param bool  $fire_after_hooks Whether to fire the after insert hooks. Default true.
 * @return int|WP_Error The menu item&#039;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&#039;t convert non-nav_menu_item objects into nav_menu_item objects.
	if ( ! empty( $menu_item_db_id ) &amp;&amp; ! is_nav_menu_item( $menu_item_db_id ) ) {
		return new WP_Error( &#039;update_nav_menu_item_failed&#039;, __( &#039;The given object ID is not that of a menu item.&#039; ) );
	}

	$menu = wp_get_nav_menu_object( $menu_id );

	if ( ! $menu &amp;&amp; 0 !== $menu_id ) {
		return new WP_Error( &#039;invalid_menu_id&#039;, __( &#039;Invalid menu ID.&#039; ) );
	}

	if ( is_wp_error( $menu ) ) {
		return $menu;
	}

	$defaults = array(
		&#039;menu-item-db-id&#039;         =&gt; $menu_item_db_id,
		&#039;menu-item-object-id&#039;     =&gt; 0,
		&#039;menu-item-object&#039;        =&gt; &#039;&#039;,
		&#039;menu-item-parent-id&#039;     =&gt; 0,
		&#039;menu-item-position&#039;      =&gt; 0,
		&#039;menu-item-type&#039;          =&gt; &#039;custom&#039;,
		&#039;menu-item-title&#039;         =&gt; &#039;&#039;,
		&#039;menu-item-url&#039;           =&gt; &#039;&#039;,
		&#039;menu-item-description&#039;   =&gt; &#039;&#039;,
		&#039;menu-item-attr-title&#039;    =&gt; &#039;&#039;,
		&#039;menu-item-target&#039;        =&gt; &#039;&#039;,
		&#039;menu-item-classes&#039;       =&gt; &#039;&#039;,
		&#039;menu-item-xfn&#039;           =&gt; &#039;&#039;,
		&#039;menu-item-status&#039;        =&gt; &#039;&#039;,
		&#039;menu-item-post-date&#039;     =&gt; &#039;&#039;,
		&#039;menu-item-post-date-gmt&#039; =&gt; &#039;&#039;,
	);

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

	if ( 0 == $menu_id ) {
		$args[&#039;menu-item-position&#039;] = 1;
	} elseif ( 0 == (int) $args[&#039;menu-item-position&#039;] ) {
		$menu_items                 = 0 == $menu_id ? array() : (array) wp_get_nav_menu_items( $menu_id, array( &#039;post_status&#039; =&gt; &#039;publish,draft&#039; ) );
		$last_item                  = array_pop( $menu_items );
		$args[&#039;menu-item-position&#039;] = ( $last_item &amp;&amp; isset( $last_item-&gt;menu_order ) ) ? 1 + $last_item-&gt;menu_order : count( $menu_items );
	}

	$original_parent = 0 &lt; $menu_item_db_id ? get_post_field( &#039;post_parent&#039;, $menu_item_db_id ) : 0;

	if ( &#039;custom&#039; === $args[&#039;menu-item-type&#039;] ) {
		// If custom menu item, trim the URL.
		$args[&#039;menu-item-url&#039;] = trim( $args[&#039;menu-item-url&#039;] );
	} else {
		/*
		 * If non-custom menu item, then:
		 * - use the original object&#039;s URL.
		 * - blank default title to sync with the original object&#039;s title.
		 */

		$args[&#039;menu-item-url&#039;] = &#039;&#039;;

		$original_title = &#039;&#039;;
		if ( &#039;taxonomy&#039; === $args[&#039;menu-item-type&#039;] ) {
			$original_parent = get_term_field( &#039;parent&#039;, $args[&#039;menu-item-object-id&#039;], $args[&#039;menu-item-object&#039;], &#039;raw&#039; );
			$original_title  = get_term_field( &#039;name&#039;, $args[&#039;menu-item-object-id&#039;], $args[&#039;menu-item-object&#039;], &#039;raw&#039; );
		} elseif ( &#039;post_type&#039; === $args[&#039;menu-item-type&#039;] ) {

			$original_object = get_post( $args[&#039;menu-item-object-id&#039;] );
			$original_parent = (int) $original_object-&gt;post_parent;
			$original_title  = $original_object-&gt;post_title;
		} elseif ( &#039;post_type_archive&#039; === $args[&#039;menu-item-type&#039;] ) {
			$original_object = get_post_type_object( $args[&#039;menu-item-object&#039;] );
			if ( $original_object ) {
				$original_title = $original_object-&gt;labels-&gt;archives;
			}
		}

		if ( wp_unslash( $args[&#039;menu-item-title&#039;] ) === wp_specialchars_decode( $original_title ) ) {
			$args[&#039;menu-item-title&#039;] = &#039;&#039;;
		}

		// Hack to get wp to create a post object when too many properties are empty.
		if ( &#039;&#039; === $args[&#039;menu-item-title&#039;] &amp;&amp; &#039;&#039; === $args[&#039;menu-item-description&#039;] ) {
			$args[&#039;menu-item-description&#039;] = &#039; &#039;;
		}
	}

	// Populate the menu item object.
	$post = array(
		&#039;menu_order&#039;   =&gt; $args[&#039;menu-item-position&#039;],
		&#039;ping_status&#039;  =&gt; 0,
		&#039;post_content&#039; =&gt; $args[&#039;menu-item-description&#039;],
		&#039;post_excerpt&#039; =&gt; $args[&#039;menu-item-attr-title&#039;],
		&#039;post_parent&#039;  =&gt; $original_parent,
		&#039;post_title&#039;   =&gt; $args[&#039;menu-item-title&#039;],
		&#039;post_type&#039;    =&gt; &#039;nav_menu_item&#039;,
	);

	$post_date = wp_resolve_post_date( $args[&#039;menu-item-post-date&#039;], $args[&#039;menu-item-post-date-gmt&#039;] );
	if ( $post_date ) {
		$post[&#039;post_date&#039;] = $post_date;
	}

	$update = 0 != $menu_item_db_id;

	// New menu item. Default is draft status.
	if ( ! $update ) {
		$post[&#039;ID&#039;]          = 0;
		$post[&#039;post_status&#039;] = &#039;publish&#039; === $args[&#039;menu-item-status&#039;] ? &#039;publish&#039; : &#039;draft&#039;;
		$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( &#039;wp_add_nav_menu_item&#039;, $menu_id, $menu_item_db_id, $args );
	}

	// Associate the menu item with the menu term.
	// Only set the menu term if it isn&#039;t set to avoid unnecessary wp_get_object_terms().
	if ( $menu_id &amp;&amp; ( ! $update || ! is_object_in_term( $menu_item_db_id, &#039;nav_menu&#039;, (int) $menu-&gt;term_id ) ) ) {
		$update_terms = wp_set_object_terms( $menu_item_db_id, array( $menu-&gt;term_id ), &#039;nav_menu&#039; );
		if ( is_wp_error( $update_terms ) ) {
			return $update_terms;
		}
	}

	if ( &#039;custom&#039; === $args[&#039;menu-item-type&#039;] ) {
		$args[&#039;menu-item-object-id&#039;] = $menu_item_db_id;
		$args[&#039;menu-item-object&#039;]    = &#039;custom&#039;;
	}

	$menu_item_db_id = (int) $menu_item_db_id;

	// Reset invalid `menu_item_parent`.
	if ( (int) $args[&#039;menu-item-parent-id&#039;] === $menu_item_db_id ) {
		$args[&#039;menu-item-parent-id&#039;] = 0;
	}

	update_post_meta( $menu_item_db_id, &#039;_menu_item_type&#039;, sanitize_key( $args[&#039;menu-item-type&#039;] ) );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_menu_item_parent&#039;, (string) ( (int) $args[&#039;menu-item-parent-id&#039;] ) );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_object_id&#039;, (string) ( (int) $args[&#039;menu-item-object-id&#039;] ) );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_object&#039;, sanitize_key( $args[&#039;menu-item-object&#039;] ) );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_target&#039;, sanitize_key( $args[&#039;menu-item-target&#039;] ) );

	$args[&#039;menu-item-classes&#039;] = array_map( &#039;sanitize_html_class&#039;, explode( &#039; &#039;, $args[&#039;menu-item-classes&#039;] ) );
	$args[&#039;menu-item-xfn&#039;]     = implode( &#039; &#039;, array_map( &#039;sanitize_html_class&#039;, explode( &#039; &#039;, $args[&#039;menu-item-xfn&#039;] ) ) );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_classes&#039;, $args[&#039;menu-item-classes&#039;] );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_xfn&#039;, $args[&#039;menu-item-xfn&#039;] );
	update_post_meta( $menu_item_db_id, &#039;_menu_item_url&#039;, sanitize_url( $args[&#039;menu-item-url&#039;] ) );

	if ( 0 == $menu_id ) {
		update_post_meta( $menu_item_db_id, &#039;_menu_item_orphaned&#039;, (string) time() );
	} elseif ( get_post_meta( $menu_item_db_id, &#039;_menu_item_orphaned&#039; ) ) {
		delete_post_meta( $menu_item_db_id, &#039;_menu_item_orphaned&#039; );
	}

	// Update existing menu item. Default is publish status.
	if ( $update ) {
		$post[&#039;ID&#039;]          = $menu_item_db_id;
		$post[&#039;post_status&#039;] = ( &#039;draft&#039; === $args[&#039;menu-item-status&#039;] ) ? &#039;draft&#039; : &#039;publish&#039;;

		$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( &#039;wp_update_nav_menu_item&#039;, $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 &#039;orderby&#039; argument was changed from &#039;none&#039;
 *              to &#039;name&#039;.
 *
 * @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(
		&#039;taxonomy&#039;   =&gt; &#039;nav_menu&#039;,
		&#039;hide_empty&#039; =&gt; false,
		&#039;orderby&#039;    =&gt; &#039;name&#039;,
	);
	$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( &#039;wp_get_nav_menus&#039;, 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-&gt;_invalid );
}

/**
 * Retrieves all menu items of a navigation menu.
 *
 * Note: Most arguments passed to the `$args` parameter – save for &#039;output_key&#039; – 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 &#039;output&#039; is ARRAY_A. Default &#039;ASC&#039;.
 *     @type string $orderby     Field to order menu items by as retrieved from get_posts(). Supply an orderby
 *                               field via &#039;output_key&#039; to affect the output order of nav menu items.
 *                               Default &#039;menu_order&#039;.
 *     @type string $post_type   Menu items post type. Default &#039;nav_menu_item&#039;.
 *     @type string $post_status Menu items post status. Default &#039;publish&#039;.
 *     @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 &#039;menu_order&#039;.
 *     @type bool   $nopaging    Whether to retrieve all menu items (true) or paginate (false). 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( &#039;nav_menu&#039; ) ) {
		return false;
	}

	$defaults = array(
		&#039;order&#039;                  =&gt; &#039;ASC&#039;,
		&#039;orderby&#039;                =&gt; &#039;menu_order&#039;,
		&#039;post_type&#039;              =&gt; &#039;nav_menu_item&#039;,
		&#039;post_status&#039;            =&gt; &#039;publish&#039;,
		&#039;output&#039;                 =&gt; ARRAY_A,
		&#039;output_key&#039;             =&gt; &#039;menu_order&#039;,
		&#039;nopaging&#039;               =&gt; true,
		&#039;update_menu_item_cache&#039; =&gt; true,
		&#039;tax_query&#039;              =&gt; array(
			array(
				&#039;taxonomy&#039; =&gt; &#039;nav_menu&#039;,
				&#039;field&#039;    =&gt; &#039;term_taxonomy_id&#039;,
				&#039;terms&#039;    =&gt; $menu-&gt;term_taxonomy_id,
			),
		),
	);
	$args     = wp_parse_args( $args, $defaults );
	if ( $menu-&gt;count &gt; 0 ) {
		$items = get_posts( $args );
	} else {
		$items = array();
	}

	$items = array_map( &#039;wp_setup_nav_menu_item&#039;, $items );

	if ( ! is_admin() ) { // Remove invalid items only on front end.
		$items = array_filter( $items, &#039;_is_valid_nav_menu_item&#039; );
	}

	if ( ARRAY_A === $args[&#039;output&#039;] ) {
		$items = wp_list_sort(
			$items,
			array(
				$args[&#039;output_key&#039;] =&gt; &#039;ASC&#039;,
			)
		);

		$i = 1;

		foreach ( $items as $k =&gt; $item ) {
			$items[ $k ]-&gt;{$args[&#039;output_key&#039;]} = $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( &#039;wp_get_nav_menu_items&#039;, $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 ( &#039;nav_menu_item&#039; !== $menu_item-&gt;post_type ) {
			continue;
		}

		$object_id = get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_object_id&#039;, true );
		$type      = get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_type&#039;, true );

		if ( &#039;post_type&#039; === $type ) {
			$post_ids[] = (int) $object_id;
		} elseif ( &#039;taxonomy&#039; === $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&#039;t exist).
 * - description:      The description of this menu item.
 * - menu_item_parent: The DB ID of the nav_menu_item that is this item&#039;s menu parent, if any. 0 otherwise.
 * - object:           The type of object originally represented, such as &#039;category&#039;, &#039;post&#039;, or &#039;attachment&#039;.
 * - 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&#039;s parent object, if any (0 otherwise).
 * - post_title:       A &quot;no title&quot; 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 &#039;post_type&#039; or &#039;taxonomy&#039;.
 * - 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 ) {
	if ( isset( $menu_item-&gt;post_type ) ) {
		if ( &#039;nav_menu_item&#039; === $menu_item-&gt;post_type ) {
			$menu_item-&gt;db_id            = (int) $menu_item-&gt;ID;
			$menu_item-&gt;menu_item_parent = ! isset( $menu_item-&gt;menu_item_parent ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_menu_item_parent&#039;, true ) : $menu_item-&gt;menu_item_parent;
			$menu_item-&gt;object_id        = ! isset( $menu_item-&gt;object_id ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_object_id&#039;, true ) : $menu_item-&gt;object_id;
			$menu_item-&gt;object           = ! isset( $menu_item-&gt;object ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_object&#039;, true ) : $menu_item-&gt;object;
			$menu_item-&gt;type             = ! isset( $menu_item-&gt;type ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_type&#039;, true ) : $menu_item-&gt;type;

			if ( &#039;post_type&#039; === $menu_item-&gt;type ) {
				$object = get_post_type_object( $menu_item-&gt;object );
				if ( $object ) {
					$menu_item-&gt;type_label = $object-&gt;labels-&gt;singular_name;
					// Denote post states for special pages (only in the admin).
					if ( function_exists( &#039;get_post_states&#039; ) ) {
						$menu_post   = get_post( $menu_item-&gt;object_id );
						$post_states = get_post_states( $menu_post );
						if ( $post_states ) {
							$menu_item-&gt;type_label = wp_strip_all_tags( implode( &#039;, &#039;, $post_states ) );
						}
					}
				} else {
					$menu_item-&gt;type_label = $menu_item-&gt;object;
					$menu_item-&gt;_invalid   = true;
				}

				if ( &#039;trash&#039; === get_post_status( $menu_item-&gt;object_id ) ) {
					$menu_item-&gt;_invalid = true;
				}

				$original_object = get_post( $menu_item-&gt;object_id );

				if ( $original_object ) {
					$menu_item-&gt;url = get_permalink( $original_object-&gt;ID );
					/** This filter is documented in wp-includes/post-template.php */
					$original_title = apply_filters( &#039;the_title&#039;, $original_object-&gt;post_title, $original_object-&gt;ID );
				} else {
					$menu_item-&gt;url      = &#039;&#039;;
					$original_title      = &#039;&#039;;
					$menu_item-&gt;_invalid = true;
				}

				if ( &#039;&#039; === $original_title ) {
					/* translators: %d: ID of a post. */
					$original_title = sprintf( __( &#039;#%d (no title)&#039; ), $menu_item-&gt;object_id );
				}

				$menu_item-&gt;title = ( &#039;&#039; === $menu_item-&gt;post_title ) ? $original_title : $menu_item-&gt;post_title;

			} elseif ( &#039;post_type_archive&#039; === $menu_item-&gt;type ) {
				$object = get_post_type_object( $menu_item-&gt;object );
				if ( $object ) {
					$menu_item-&gt;title      = ( &#039;&#039; === $menu_item-&gt;post_title ) ? $object-&gt;labels-&gt;archives : $menu_item-&gt;post_title;
					$post_type_description = $object-&gt;description;
				} else {
					$post_type_description = &#039;&#039;;
					$menu_item-&gt;_invalid   = true;
				}

				$menu_item-&gt;type_label = __( &#039;Post Type Archive&#039; );
				$post_content          = wp_trim_words( $menu_item-&gt;post_content, 200 );
				$post_type_description = ( &#039;&#039; === $post_content ) ? $post_type_description : $post_content;
				$menu_item-&gt;url        = get_post_type_archive_link( $menu_item-&gt;object );

			} elseif ( &#039;taxonomy&#039; === $menu_item-&gt;type ) {
				$object = get_taxonomy( $menu_item-&gt;object );
				if ( $object ) {
					$menu_item-&gt;type_label = $object-&gt;labels-&gt;singular_name;
				} else {
					$menu_item-&gt;type_label = $menu_item-&gt;object;
					$menu_item-&gt;_invalid   = true;
				}

				$original_object = get_term( (int) $menu_item-&gt;object_id, $menu_item-&gt;object );

				if ( $original_object &amp;&amp; ! is_wp_error( $original_object ) ) {
					$menu_item-&gt;url = get_term_link( (int) $menu_item-&gt;object_id, $menu_item-&gt;object );
					$original_title = $original_object-&gt;name;
				} else {
					$menu_item-&gt;url      = &#039;&#039;;
					$original_title      = &#039;&#039;;
					$menu_item-&gt;_invalid = true;
				}

				if ( &#039;&#039; === $original_title ) {
					/* translators: %d: ID of a term. */
					$original_title = sprintf( __( &#039;#%d (no title)&#039; ), $menu_item-&gt;object_id );
				}

				$menu_item-&gt;title = ( &#039;&#039; === $menu_item-&gt;post_title ) ? $original_title : $menu_item-&gt;post_title;

			} else {
				$menu_item-&gt;type_label = __( &#039;Custom Link&#039; );
				$menu_item-&gt;title      = $menu_item-&gt;post_title;
				$menu_item-&gt;url        = ! isset( $menu_item-&gt;url ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_url&#039;, true ) : $menu_item-&gt;url;
			}

			$menu_item-&gt;target = ! isset( $menu_item-&gt;target ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_target&#039;, true ) : $menu_item-&gt;target;

			/**
			 * Filters a navigation menu item&#039;s title attribute.
			 *
			 * @since 3.0.0
			 *
			 * @param string $item_title The menu item title attribute.
			 */
			$menu_item-&gt;attr_title = ! isset( $menu_item-&gt;attr_title ) ? apply_filters( &#039;nav_menu_attr_title&#039;, $menu_item-&gt;post_excerpt ) : $menu_item-&gt;attr_title;

			if ( ! isset( $menu_item-&gt;description ) ) {
				/**
				 * Filters a navigation menu item&#039;s description.
				 *
				 * @since 3.0.0
				 *
				 * @param string $description The menu item description.
				 */
				$menu_item-&gt;description = apply_filters( &#039;nav_menu_description&#039;, wp_trim_words( $menu_item-&gt;post_content, 200 ) );
			}

			$menu_item-&gt;classes = ! isset( $menu_item-&gt;classes ) ? (array) get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_classes&#039;, true ) : $menu_item-&gt;classes;
			$menu_item-&gt;xfn     = ! isset( $menu_item-&gt;xfn ) ? get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_xfn&#039;, true ) : $menu_item-&gt;xfn;
		} else {
			$menu_item-&gt;db_id            = 0;
			$menu_item-&gt;menu_item_parent = 0;
			$menu_item-&gt;object_id        = (int) $menu_item-&gt;ID;
			$menu_item-&gt;type             = &#039;post_type&#039;;

			$object                = get_post_type_object( $menu_item-&gt;post_type );
			$menu_item-&gt;object     = $object-&gt;name;
			$menu_item-&gt;type_label = $object-&gt;labels-&gt;singular_name;

			if ( &#039;&#039; === $menu_item-&gt;post_title ) {
				/* translators: %d: ID of a post. */
				$menu_item-&gt;post_title = sprintf( __( &#039;#%d (no title)&#039; ), $menu_item-&gt;ID );
			}

			$menu_item-&gt;title  = $menu_item-&gt;post_title;
			$menu_item-&gt;url    = get_permalink( $menu_item-&gt;ID );
			$menu_item-&gt;target = &#039;&#039;;

			/** This filter is documented in wp-includes/nav-menu.php */
			$menu_item-&gt;attr_title = apply_filters( &#039;nav_menu_attr_title&#039;, &#039;&#039; );

			/** This filter is documented in wp-includes/nav-menu.php */
			$menu_item-&gt;description = apply_filters( &#039;nav_menu_description&#039;, &#039;&#039; );
			$menu_item-&gt;classes     = array();
			$menu_item-&gt;xfn         = &#039;&#039;;
		}
	} elseif ( isset( $menu_item-&gt;taxonomy ) ) {
		$menu_item-&gt;ID               = $menu_item-&gt;term_id;
		$menu_item-&gt;db_id            = 0;
		$menu_item-&gt;menu_item_parent = 0;
		$menu_item-&gt;object_id        = (int) $menu_item-&gt;term_id;
		$menu_item-&gt;post_parent      = (int) $menu_item-&gt;parent;
		$menu_item-&gt;type             = &#039;taxonomy&#039;;

		$object                = get_taxonomy( $menu_item-&gt;taxonomy );
		$menu_item-&gt;object     = $object-&gt;name;
		$menu_item-&gt;type_label = $object-&gt;labels-&gt;singular_name;

		$menu_item-&gt;title       = $menu_item-&gt;name;
		$menu_item-&gt;url         = get_term_link( $menu_item, $menu_item-&gt;taxonomy );
		$menu_item-&gt;target      = &#039;&#039;;
		$menu_item-&gt;attr_title  = &#039;&#039;;
		$menu_item-&gt;description = get_term_field( &#039;description&#039;, $menu_item-&gt;term_id, $menu_item-&gt;taxonomy );
		$menu_item-&gt;classes     = array();
		$menu_item-&gt;xfn         = &#039;&#039;;

	}

	/**
	 * Filters a navigation menu item object.
	 *
	 * @since 3.0.0
	 *
	 * @param object $menu_item The menu item object.
	 */
	return apply_filters( &#039;wp_setup_nav_menu_item&#039;, $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 &#039;post_type&#039; or &#039;taxonomy&#039;.
 *                            Default &#039;post_type&#039;.
 * @param string $taxonomy    Optional. If $object_type is &#039;taxonomy&#039;, $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 = &#039;post_type&#039;, $taxonomy = &#039;&#039; ) {
	$object_id     = (int) $object_id;
	$menu_item_ids = array();

	$query      = new WP_Query();
	$menu_items = $query-&gt;query(
		array(
			&#039;meta_key&#039;       =&gt; &#039;_menu_item_object_id&#039;,
			&#039;meta_value&#039;     =&gt; $object_id,
			&#039;post_status&#039;    =&gt; &#039;any&#039;,
			&#039;post_type&#039;      =&gt; &#039;nav_menu_item&#039;,
			&#039;posts_per_page&#039; =&gt; -1,
		)
	);
	foreach ( (array) $menu_items as $menu_item ) {
		if ( isset( $menu_item-&gt;ID ) &amp;&amp; is_nav_menu_item( $menu_item-&gt;ID ) ) {
			$menu_item_type = get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_type&#039;, true );
			if (
				&#039;post_type&#039; === $object_type &amp;&amp;
				&#039;post_type&#039; === $menu_item_type
			) {
				$menu_item_ids[] = (int) $menu_item-&gt;ID;
			} elseif (
				&#039;taxonomy&#039; === $object_type &amp;&amp;
				&#039;taxonomy&#039; === $menu_item_type &amp;&amp;
				get_post_meta( $menu_item-&gt;ID, &#039;_menu_item_object&#039;, true ) == $taxonomy
			) {
				$menu_item_ids[] = (int) $menu_item-&gt;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, &#039;post_type&#039; );

	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, &#039;taxonomy&#039;, $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 ( &#039;publish&#039; !== $new_status || &#039;publish&#039; === $old_status || &#039;page&#039; !== $post-&gt;post_type ) {
		return;
	}
	if ( ! empty( $post-&gt;post_parent ) ) {
		return;
	}
	$auto_add = get_option( &#039;nav_menu_options&#039; );
	if ( empty( $auto_add ) || ! is_array( $auto_add ) || ! isset( $auto_add[&#039;auto_add&#039;] ) ) {
		return;
	}
	$auto_add = $auto_add[&#039;auto_add&#039;];
	if ( empty( $auto_add ) || ! is_array( $auto_add ) ) {
		return;
	}

	$args = array(
		&#039;menu-item-object-id&#039; =&gt; $post-&gt;ID,
		&#039;menu-item-object&#039;    =&gt; $post-&gt;post_type,
		&#039;menu-item-type&#039;      =&gt; &#039;post_type&#039;,
		&#039;menu-item-status&#039;    =&gt; &#039;publish&#039;,
	);

	foreach ( $auto_add as $menu_id ) {
		$items = wp_get_nav_menu_items( $menu_id, array( &#039;post_status&#039; =&gt; &#039;publish,draft&#039; ) );
		if ( ! is_array( $items ) ) {
			continue;
		}
		foreach ( $items as $item ) {
			if ( $post-&gt;ID == $item-&gt;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 || &#039;customize_changeset&#039; !== $post-&gt;post_type ) {
		return;
	}

	$data = json_decode( $post-&gt;post_content, true );
	if ( empty( $data[&#039;nav_menus_created_posts&#039;][&#039;value&#039;] ) ) {
		return;
	}
	remove_action( &#039;delete_post&#039;, &#039;_wp_delete_customize_changeset_dependent_auto_drafts&#039; );
	foreach ( $data[&#039;nav_menus_created_posts&#039;][&#039;value&#039;] as $stub_post_id ) {
		if ( empty( $stub_post_id ) ) {
			continue;
		}
		if ( &#039;auto-draft&#039; === get_post_status( $stub_post_id ) ) {
			wp_delete_post( $stub_post_id, true );
		} elseif ( &#039;draft&#039; === get_post_status( $stub_post_id ) ) {
			wp_trash_post( $stub_post_id );
			delete_post_meta( $stub_post_id, &#039;_customize_changeset_uuid&#039; );
		}
	}
	add_action( &#039;delete_post&#039;, &#039;_wp_delete_customize_changeset_dependent_auto_drafts&#039; );
}

/**
 * Handles menu config after theme change.
 *
 * @access private
 * @since 4.9.0
 */
function _wp_menus_changed() {
	$old_nav_menu_locations    = get_option( &#039;theme_switch_menu_locations&#039;, 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( &#039;nav_menu_locations&#039;, $mapped_nav_menu_locations );
	delete_option( &#039;theme_switch_menu_locations&#039; );
}

/**
 * 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&#039;re done.
	if ( 1 === count( $old_nav_menu_locations ) &amp;&amp; 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 =&gt; $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&#039;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( &#039;primary&#039;, &#039;menu-1&#039;, &#039;main&#039;, &#039;header&#039;, &#039;navigation&#039;, &#039;top&#039; ),
		array( &#039;secondary&#039;, &#039;menu-2&#039;, &#039;footer&#039;, &#039;subsidiary&#039;, &#039;bottom&#039; ),
		array( &#039;social&#039; ),
	);

	// 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 =&gt; $name ) {

				// ...actually match!
				if ( is_string( $new_location ) &amp;&amp; false === stripos( $new_location, $slug ) &amp;&amp; false === stripos( $slug, $new_location ) ) {
					continue;
				} elseif ( is_numeric( $new_location ) &amp;&amp; $new_location !== $slug ) {
					continue;
				}

				// Then see if any of the old locations...
				foreach ( $old_nav_menu_locations as $location =&gt; $menu_id ) {

					// ...and any slug in the same group...
					foreach ( $slug_group as $slug ) {

						// ... have a match as well.
						if ( is_string( $location ) &amp;&amp; false === stripos( $location, $slug ) &amp;&amp; false === stripos( $slug, $location ) ) {
							continue;
						} elseif ( is_numeric( $location ) &amp;&amp; $location !== $slug ) {
							continue;
						}

						// Make sure this location wasn&#039;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&#039;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 =&gt; $menu_id ).
			} // End foreach foreach ( $registered_nav_menus as $new_location =&gt; $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[&#039;ID&#039;] ) &amp;&amp;
		! empty( $menu_item_data[&#039;menu_item_parent&#039;] ) &amp;&amp;
		(int) $menu_item_data[&#039;ID&#039;] === (int) $menu_item_data[&#039;menu_item_parent&#039;]
	) {
		$menu_item_data[&#039;menu_item_parent&#039;] = 0;
	}

	return $menu_item_data;
}
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