function PrivateTempStore::startSession
Start session because it is required for a private temp store.
Ensures that an anonymous user has a session created for them, as otherwise subsequent page loads will not be able to retrieve their tempstore data.
File
- 
              core/
lib/ Drupal/ Core/ TempStore/ PrivateTempStore.php, line 236  
Class
- PrivateTempStore
 - Stores and retrieves temporary data for a given owner.
 
Namespace
Drupal\Core\TempStoreCode
protected function startSession() {
  @trigger_error(__METHOD__ . "() is deprecated in drupal:10.3.0 and is removed from drupal:11.0.0. There is no replacement. See https://www.drupal.org/node/3432359", E_USER_DEPRECATED);
  $has_session = $this->requestStack
    ->getCurrentRequest()
    ->hasSession();
  if (!$has_session) {
    /** @var \Symfony\Component\HttpFoundation\Session\SessionInterface $session */
    $session = \Drupal::service('session');
    $this->requestStack
      ->getCurrentRequest()
      ->setSession($session);
    $session->start();
  }
}
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