public OptionsProviderInterface::getPossibleValues(AccountInterface $account = NULL)
Returns an array of possible values.
If the optional $account parameter is passed, then the array is filtered to values viewable by the account.
\Drupal\Core\Session\AccountInterface $account: (optional) The user account for which to filter the possible values. If omitted, all possible values are returned.
array An array of possible values.
public function getPossibleValues(AccountInterface $account = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!OptionsProviderInterface.php/function/OptionsProviderInterface::getPossibleValues/8.1.x