public MenuLinkManagerInterface::getChildIds($id)
Loads all child link IDs of a given menu link, regardless of visibility.
This method is mostly useful for testing.
string $id: The menu link plugin ID.
array An unordered array of IDs representing the IDs of all children, or NULL if the ID is invalid.
public function getChildIds($id);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkManagerInterface.php/function/MenuLinkManagerInterface::getChildIds/8.1.x