WP_Customize_Nav_Menu_Item_Setting

20class WP_Customize_Nav_Menu_Item_Setting extends WP_Customize_Setting {21 22	const ID_PATTERN = '/^nav_menu_item\[(?P<id>-?\d+)\]$/';23 24	const POST_TYPE = 'nav_menu_item';25 26	const TYPE = 'nav_menu_item';27 28	/**29	 * Setting type.30	 *31	 * @since 4.3.032	 * @var string33	 */34	public $type = self::TYPE;35 36	/**37	 * Default setting value.38	 *39	 * @since 4.3.040	 * @var array41	 *42	 * @see wp_setup_nav_menu_item()43	 */44	public $default = array(45		// The $menu_item_data for wp_update_nav_menu_item().46		'object_id'        => 0,47		'object'           => '', // Taxonomy name.48		'menu_item_parent' => 0, // A.K.A. menu-item-parent-id; note that post_parent is different, and not included.49		'position'         => 0, // A.K.A. menu_order.50		'type'             => 'custom', // Note that type_label is not included here.51		'title'            => '',52		'url'              => '',53		'target'           => '',54		'attr_title'       => '',55		'description'      => '',56		'classes'          => '',57		'xfn'              => '',58		'status'           => 'publish',59		'nav_menu_term_id' => 0, // This will be supplied as the $menu_id arg for wp_update_nav_menu_item().60		'_invalid'         => false,61	);62 63	/**64	 * Default transport.65	 *66	 * @since 4.3.067	 * @since 4.5.0 Default changed to 'refresh'68	 * @var string69	 */70	public $transport = 'refresh';71 72	/**73	 * The post ID represented by this setting instance. This is the db_id.74	 *75	 * A negative value represents a placeholder ID for a new menu not yet saved.76	 *77	 * @since 4.3.078	 * @var int79	 */80	public $post_id;81 82	/**83	 * Storage of pre-setup menu item to prevent wasted calls to wp_setup_nav_menu_item().84	 *85	 * @since 4.3.086	 * @var array|null87	 */88	protected $value;89 90	/**91	 * Previous (placeholder) post ID used before creating a new menu item.92	 *93	 * This value will be exported to JS via the customize_save_response filter94	 * so that JavaScript can update the settings to refer to the newly-assigned95	 * post ID. This value is always negative to indicate it does not refer to96	 * a real post.97	 *98	 * @since 4.3.099	 * @var int