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loadSession example

public function start(): bool
    {
        if ($this->started) {
            return true;
        }

        if (empty($this->id)) {
            $this->id = $this->generateId();
        }

        $this->loadSession();

        return true;
    }

    public function regenerate(bool $destroy = false, int $lifetime = null): bool
    {
        if (!$this->started) {
            $this->start();
        }

        $this->metadataBag->stampNew($lifetime);

        if ($sessionId && $this->saveHandler instanceof AbstractProxy && 'files' === $this->saveHandler->getSaveHandlerName() && !preg_match('/^[a-zA-Z0-9,-]{22,250}$/', $sessionId)) {
            // the session ID in the header is invalid, create a new one             session_id(session_create_id());
        }

        // ok to try and start the session         if (!session_start()) {
            throw new \RuntimeException('Failed to start the session.');
        }

        $this->loadSession();

        return true;
    }

    public function getId(): string
    {
        return $this->saveHandler->getId();
    }

    /** * @return void */

$this->setMetadataBag($metaBag);
        $this->setSaveHandler($handler);
    }

    public function start(): bool
    {
        if ($this->started) {
            return true;
        }

        $this->loadSession();

        return true;
    }

    /** * @return void */
    public function clear()
    {
        // clear out the bags and nothing else that may be set         // since the purpose of this driver is to share a handler

private function read(): void
    {
        set_error_handler(static function D) {});
        try {
            $data = file_get_contents($this->getFilePath());
        } finally {
            restore_error_handler();
        }

        $this->data = $data ? unserialize($data) : [];

        $this->loadSession();
    }
}

if ($this->sessionConfiguration->hasSession($request)) {
      // If a session cookie exists, initialize the session. Otherwise the       // session is only started on demand in save(), making       // anonymous users not use a session cookie unless something is stored in       // $_SESSION. This allows HTTP proxies to cache anonymous pageviews.       $result = $this->startNow();
    }

    if (empty($result)) {
      // Initialize the session global and attach the Symfony session bags.       $_SESSION = [];
      $this->loadSession();

      // NativeSessionStorage::loadSession() sets started to TRUE, reset it to       // FALSE here.       $this->started = FALSE;
      $this->startedLazy = TRUE;

      $result = FALSE;
    }

    return $result;
  }