Adds a span tag of the TITLE attribute in the output of Wordpress menus

gistfile1.txt

add_filter('walker_nav_menu_start_el', 'description_in_nav_el', 10, 4);
function description_in_nav_el($item_output, $item, $depth, $args)
{
	return preg_replace('/(<a.*?>[^<]*?)</', "<span>{$item->attr_title}</span>" . '$1' . "<", $item_output);
}