array $menu_order )
Filters the order of administration menu items.
A truthy value must first be passed to the ‘custom_menu_order’ filter for this filter to work. Use the following to enable custom menu ordering:
add_filter( 'custom_menu_order', '__return_true' );
(array) An ordered array of menu items.
When filtering the order array, any menus that are not mentioned in the array will be sorted after ones that are mentioned. Unmentioned menus are sorted in their usual order, relative to other unmentioned menus.