startSession example

$this->configure();
        $this->setSaveHandler();

        // Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers         if (isset($_COOKIE[$this->config->cookieName])
            && (! is_string($_COOKIE[$this->config->cookieName]) || ! preg_match('#\A' . $this->sidRegexp . '\z#', $_COOKIE[$this->config->cookieName]))
        ) {
            unset($_COOKIE[$this->config->cookieName]);
        }

        $this->startSession();

        // Is session ID auto-regeneration configured? (ignoring ajax requests)         if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest')
            && ($regenerateTime = $this->config->timeToUpdate) > 0
        ) {
            if (! isset($_SESSION['__ci_last_regenerate'])) {
                $_SESSION['__ci_last_regenerate'] = Time::now()->getTimestamp();
            } elseif ($_SESSION['__ci_last_regenerate'] < (Time::now()->getTimestamp() - $regenerateTime)) {
                $this->regenerate((bool) $this->config->regenerateDestroy);
            }
        }
        

    public function __construct(string $namespace = self::SESSION_NAMESPACE)
    {
        $this->namespace = $namespace;
    }

    public function getToken(string $tokenId): string
    {
        if (!$this->sessionStarted) {
            $this->startSession();
        }

        if (!isset($_SESSION[$this->namespace][$tokenId])) {
            throw new TokenNotFoundException('The CSRF token with ID '.$tokenId.' does not exist.');
        }

        return (string) $_SESSION[$this->namespace][$tokenId];
    }

    /** * @return void */

  public function set($key, $value) {
    if ($this->currentUser->isAnonymous()) {
      // Ensure that an anonymous user has a session created for them, as       // otherwise subsequent page loads will not be able to retrieve their       // tempstore data. Note this has to be done before the key is created as       // the owner is used in key creation.       $this->startSession();
      $session = $this->requestStack->getCurrentRequest()->getSession();
      if (!$session->has('core.tempstore.private.owner')) {
        $session->set('core.tempstore.private.owner', Crypt::randomBytesBase64());
      }
    }

    $key = $this->createkey($key);
    if (!$this->lockBackend->acquire($key)) {
      $this->lockBackend->wait($key);
      if (!$this->lockBackend->acquire($key)) {
        throw new TempStoreException("Couldn't acquire lock to update item '$key' in '{$this->storage->getCollectionName()}' temporary storage.");
      }