public StateInterface::resetCache() Resets

public StateInterface::delete($key) Deletes

public StateInterface::set($key, $value) Saves

public StateInterface::deleteMultiple(array $keys)

public StateInterface::get($key, $default = NULL)

public StateInterface::getMultiple(array $keys)

Defines the interface for the state system. Hierarchy interface \Drupal\Core\State\

public StateInterface::setMultiple(array $data)