apply_filters( 'nav_menu_css_class', array $classes, WP_Post $item, stdClass $args, int $depth )

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

Parameters

$classes: (array) The CSS classes that are applied to the menu item's <li> element.
$item: (WP_Post) The current menu item.
$args: (stdClass) An object of wp_nav_menu() arguments.
$depth: (int) Depth of menu item. Used for padding.

Used By
Used By	Description
wp-includes/class-walker-nav-menu.php: Walker_Nav_Menu::start_el()	Starts the element output.

Changelog
Version	Description
WP-4.1.0	The `$depth` parameter was added.
WP-3.0.0	Introduced.