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

Parameters

$classesstring[]

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

$argsstdClass

An object of wp_nav_menu() arguments.

$depthint

Depth of menu item. Used for padding.

Source

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

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