public StateInterface::getMultiple(array $keys)
Returns the stored key/value pairs for a given set of keys.
array $keys: A list of keys to retrieve.
array An associative array of items successfully returned, indexed by key.
public function getMultiple(array $keys);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!State!StateInterface.php/function/StateInterface::getMultiple/8.1.x