Choosing the active menu

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I'm been trying to do this as well. The difficulty is I can't find a way to get the current root menu. There is menu_get_active_trail(), but that doesn't include the menu name (e.g. 'primary-links'). Oddly, this used to work in Drupal 5.

There's also menu_get_active_menu_name(), but it always (incorrectly IMO) returns 'navigation'. I looked at the code and it seems like this API function was essentially left unimplemented -- it's never set anywhere (except the book module).

I have found a workaround for my current situation. I'm using the trick where the primary / secondary links are pulled from the same menu, and I want the secondary links displayed as a block.

I put this in the block visibility settings for the local_menu block:

// Only show this if there are secondary links, to prevent it from being displayed in admin menu etc
if (sizeof(menu_secondary_links()) > 0) {
  return true;
} else {
  return false;
}

There is an easy way of hiding this block on admin-pages:

Edit the local-menu-block and insert "admin" and "admin/*" to "Page specific visibility settings". Choose the first radio-button and it won't display the local menu twice on admin pages.

Have a look at #296558: Default menu option when item in multiple blocks which looks like an alternative solution.

There's a patch in #296558: Default menu option when item in multiple blocks that allows you to choose which menu to show if an item is in multiple menus.