list of menu items in the dropdown. Each array element can be either an HTML string,
or an array representing a single menu with the following structure:
- label: string, required, the label of the item link.
- encode: boolean, optional, whether to HTML-ecnode item label.
- url: string|array, optional, the url of the item link. This will be processed by [[Url::to()]].
If not set, the item will be treated as a menu header when the item has no sub-menu.
- visible: boolean, optional, whether this menu item is visible. Defaults to true.
- linkOptions: array, optional, the HTML attributes of the item link.
- options: array, optional, the HTML attributes of the item.
- items: array, optional, the submenu items. The structure is the same as this property.
Note that Bootstrap doesn't support dropdown submenu. You have to add your own CSS styles to support it.
- submenuOptions: array, optional, the HTML attributes for sub-menu container tag. If specified it will be
merged with [[submenuOptions]].
To insert divider use .