An array of parent link IDs.
This restricts the tree to only menu links that are at the top level or have a parent ID in this list. If empty, the whole menu tree is built.
Type: string[]
public $expandedParents = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuTreeParameters.php/property/MenuTreeParameters::expandedParents/8.1.x