Menu: edit items

To edit individual items of a menu

add_filter( 'wp_nav_menu_objects', 'dev__add_smiley', 11, 2 );

function dev__add_smiley( $items, $args ) {

	foreach ( $items as &$item ) {

		// add class
		array_push($item->classes, 'dw-submenu__parent');
			
		$item->title = ':D ' . $item->title;

		// $item->title .= '</a>' . $subelement; note: close the link

		}

	}

	return $items;

}

Sources:

• https://developer.wordpress.org/reference/hooks/wp_nav_menu_items/
• https://developer.wordpress.org/reference/hooks/wp_nav_menu_objects/