Prado\Web\UI\TSessionPageStatePersister::save PHP Метод

    public function save($state)
    {
        $session = $this->_page->getSession();
        $session->open();
        $data = serialize($state);
        $timestamp = (string) microtime(true);
        $key = self::STATE_SESSION_KEY . $timestamp;
        $session->add($key, $data);
        if (($queue = $session->itemAt(self::QUEUE_SESSION_KEY)) === null) {
            $queue = array();
        }
        $queue[] = $key;
        if (count($queue) > $this->getHistorySize()) {
            $expiredKey = array_shift($queue);
            $session->remove($expiredKey);
        }
        $session->add(self::QUEUE_SESSION_KEY, $queue);
        $this->_page->setClientState(TPageStateFormatter::serialize($this->_page, $timestamp));
    }