Add search box to menu

gistfile1.txt

add_filter( 'wp_nav_menu_items','add_search_box_to_menu', 10, 2);
function add_search_box_to_menu( $items, $args ) {
    if( $args->theme_location == 'primary' )
        //return $items."<li class='menu-header-search'><form class='searchform' action=''><input type='text' value='' class='search-box' name='s' id='s'  placeholder='' /><i class='icon-search'></i></form></li>";
    	  return $items."<li class='menu-header-search'><form class='searchform' action=''><i class='icon-search'></i></form></li>";
    return $items;
}