twentynineteen_add_mobile_parent_nav_menu_items( array $sorted_menu_items, object $args ): array

208function twentynineteen_add_mobile_parent_nav_menu_items( $sorted_menu_items, $args ) {209	static $pseudo_id = 0;210	if ( ! isset( $args->theme_location ) || 'menu-1' !== $args->theme_location ) {211		return $sorted_menu_items;212	}213 214	$amended_menu_items = array();215	foreach ( $sorted_menu_items as $nav_menu_item ) {216		$amended_menu_items[] = $nav_menu_item;217		if ( in_array( 'menu-item-has-children', $nav_menu_item->classes, true ) ) {218			$parent_menu_item                   = clone $nav_menu_item;219			$parent_menu_item->original_id      = $nav_menu_item->ID;220			$parent_menu_item->ID               = --$pseudo_id;221			$parent_menu_item->db_id            = $parent_menu_item->ID;222			$parent_menu_item->object_id        = $parent_menu_item->ID;223			$parent_menu_item->classes          = array( 'mobile-parent-nav-menu-item' );224			$parent_menu_item->menu_item_parent = $nav_menu_item->ID;225 226			$amended_menu_items[] = $parent_menu_item;227		}228	}229 230	return $amended_menu_items;231}