WordPress at a glance
filter is not described

add_menu_classes filter-hook . WP 2.7.0

Filters administration menus array with classes added for top-level items.

Usage

add_filter( 'add_menu_classes', 'filter_function_name_6352' );
function filter_function_name_6352( $menu ){
	// filter...

	return $menu;
}
$menu(array)
Associative array of administration menu items.

Where the hook is called

add_menu_classes()
wp-admin/includes/menu.php 238
return apply_filters( 'add_menu_classes', $menu );

Where the hook is used (in WP core)

Does not used.