Drupal7

How to config dropdown menu in bartik

https://www.youtube.com/watch?v=oPP6LNLeGcg

  // id, direction, depth should have the values you want them to have.
  $menu = theme('nice_menus', array('id' => 0, 'direction' => 'down', 'depth' => 1, 'menu_name' => 'main-menu', 'menu' => NULL));
  print $menu['content'];?>

https://www.drupal.org/node/240831

http://themery.com/book/export/html/71

theme block 

php5-gd

add this into php.ini

extension=gd.so