nav_menu_submenu_css_class │ filter-hook │ WP 4.8.0

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

Usage

add_filter( 'nav_menu_submenu_css_class', 'wp_kama_nav_menu_submenu_css_class_filter', 10, 3 );

/**
 * Function for `nav_menu_submenu_css_class` filter-hook.
 * 
 * @param string[] $classes Array of the CSS classes that are applied to the menu `<ul>` element.
 * @param stdClass $args    An object of `wp_nav_menu()` arguments.
 * @param int      $depth   Depth of menu item. Used for padding.
 *
 * @return string[]
 */
function wp_kama_nav_menu_submenu_css_class_filter( $classes, $args, $depth ){

	// filter...
	return $classes;
}

$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.

Changelog

Where the hook is called

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

Where the hook is used in WordPress