Gets only the top level items below the 'admin' path.
An array containing a menu tree of top level items below the 'admin' path.
function toolbar_get_menu_tree() {
$tree = array();
$query = Drupal::entityQuery('menu_link')
->condition('menu_name', 'admin')
->condition('module', 'system')
->condition('link_path', 'admin');
$result = $query
->execute();
if (!empty($result)) {
$admin_link = menu_link_load(reset($result));
$tree = menu_build_tree('admin', array(
'expanded' => array(
$admin_link['mlid'],
),
'min_depth' => $admin_link['depth'] + 1,
'max_depth' => $admin_link['depth'] + 1,
));
}
return $tree;
}