public MenuTreeStorageInterface::getExpanded($menu_name, array $parents)
Finds expanded links in a menu given a set of possible parents.
string $menu_name: The menu name.
array $parents: One or more parent IDs to match.
array The menu link IDs that are flagged as expanded in this menu.
public function getExpanded($menu_name, array $parents);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuTreeStorageInterface.php/function/MenuTreeStorageInterface::getExpanded/8.1.x