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