Filters the CSS class(es) applied to a menu list element.

$classes string[]

Array of the CSS classes that are applied to the menu <ul> element.

$args stdClass

An object of wp_nav_menu() arguments.

$depth int

Depth of menu item. Used for padding.

File: wp-includes/class-walker-nav-menu.php. View all references

$class_names = implode( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) );