Do not show path to sub menu items in breadcrumb

Question

I would like to hide the path to sub menu item which is shown in the breadcrumb once you request a page by clicking the sub menu.

Here is the code I am using to create a menu item and three sub menu items:

    $items['what-to-expect'] = array(
        'title' => t('What To Expect'),
        'page callback' => 'pvmf_layout_what_to_expect',
        'access arguments' => array('access content'),
        'menu_name' => 'main-menu',
        'type' => MENU_NORMAL_ITEM,
        'weight' => 1,
        'expanded' => TRUE
      );
      $items['what-to-expect/0'] = array(
        'title' => t('Local Event'),
        'page callback' => 'pvmf_layout_what_to_expect_0',
        'access arguments' => array('access content'),
        'type' => MENU_NORMAL_ITEM,
        'weight' => 0
      );
      $items['what-to-expect/1'] = array(
        'title' => t('Online Event'),
        'page callback' => 'pvmf_layout_what_to_expect_1',
        'access arguments' => array('access content'),
        'type' => MENU_NORMAL_ITEM,
        'weight' => 1
      );
      $items['what-to-expect/2'] = array(
        'title' => t('ONE Presenters'),
        'page callback' => 'pvmf_layout_what_to_expect_2',
        'access arguments' => array('access content'),
        'type' => MENU_NORMAL_ITEM,
        'weight' => 2
      );

Here is what I see:

After I change the type in definition here is the code I am getting:

$items['what-to-expect'] = array(
    'title' => t('What To Expect'),
    'page callback' => 'pvmf_layout_what_to_expect',
    'access arguments' => array('access content'),
    'menu_name' => 'main-menu',
    'type' => MENU_VISIBLE_IN_TREE,
    'weight' => 1,
    'expanded' => TRUE
  );
  $items['what-to-expect/0'] = array(
    'title' => t('Local Event'),
    'page callback' => 'pvmf_layout_what_to_expect_0',
    'access arguments' => array('access content'),
    'type' => MENU_VISIBLE_IN_TREE,
    'weight' => 0
  );
  $items['what-to-expect/1'] = array(
    'title' => t('Online Event'),
    'page callback' => 'pvmf_layout_what_to_expect_1',
    'access arguments' => array('access content'),
    'type' => MENU_VISIBLE_IN_TREE,
    'weight' => 1
  );
  $items['what-to-expect/2'] = array(
    'title' => t('ONE Presenters'),
    'page callback' => 'pvmf_layout_what_to_expect_2',
    'access arguments' => array('access content'),
    'type' => MENU_VISIBLE_IN_TREE,
    'weight' => 2
  );

But breadcrumbs still continue to show. I tried to clear the cache by going to Configuration -> Performance, but it did not help. What may I miss here?

I checked that menu.inc actually contains:

/**
 * Menu type -- A "normal" menu item that's shown in menu and breadcrumbs.
 *
 * Normal menu items show up in the menu tree and can be moved/hidden by
 * the administrator. Use this for most menu items. It is the default value if
 * no menu item type is specified.
 */
define('MENU_NORMAL_ITEM', MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB);

Answer 1

Use type => MENU_VISIBLE_IN_TREE in sub menu items definition so that they are visible only in the menu, not in the breadcrumb.

The flags for the menu item types are defined in includes/menu.inc. There we can see that the MENU_NORMAL_ITEM flag takes its bits from the bitwise OR operation of MENU_VISIBLE_IN_TREE and MENU_VISIBLE_IN_BREADCRUMB:

/**
 * Menu type -- A "normal" menu item that's shown in menu and breadcrumbs.
 *
 * Normal menu items show up in the menu tree and can be moved/hidden by
 * the administrator. Use this for most menu items. It is the default value if
 * no menu item type is specified.
 */
define('MENU_NORMAL_ITEM', MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB);

That means the flag for a MENU_NORMAL_ITEM not showing in the breadcrumb is MENU_VISIBLE_IN_TREE.