Thruway\Subscription\Subscription::processStateQueue PHP Method

    private function processStateQueue($lastPublicationId = null)
    {
        if ($lastPublicationId !== null) {
            // create an array of pub ids
            // if we can't find the lastPublicationId in the queue
            // then we are going to assume it was before our time
            $pubIds = [];
            /** @var EventMessage $msg */
            foreach ($this->pauseQueue as $msg) {
                $pubIds[] = $msg->getPublicationId();
            }
            if (!in_array($lastPublicationId, $pubIds)) {
                $lastPublicationId = null;
            }
        }
        while (!$this->pauseQueue->isEmpty()) {
            $msg = $this->pauseQueue->dequeue();
            if ($lastPublicationId === null) {
                $this->sendEventMessage($msg);
            }
            if ($lastPublicationId == $msg->getPublicationId()) {
                $lastPublicationId = null;
            }
        }
    }