GraphAware\Neo4j\Client\HttpDriver\Session::begin PHP Method

    public function begin()
    {
        $request = new Request('POST', sprintf('%s/db/data/transaction', $this->uri));
        try {
            return $this->httpClient->send($request);
        } catch (RequestException $e) {
            if ($e->hasResponse()) {
                $body = json_decode($e->getResponse()->getBody(), true);
                if (!isset($body['code'])) {
                    throw $e;
                }
                $msg = sprintf('Neo4j Exception with code "%s" and message "%s"', $body['errors'][0]['code'], $body['errors'][0]['message']);
                $exception = new Neo4jException($msg);
                $exception->setNeo4jStatusCode($body['errors'][0]['code']);
                throw $exception;
            }
            throw $e;
        }
    }

 /**
  * {@inheritdoc}
  */
 public function begin()
 {
     $this->assertNotStarted();
     $response = $this->session->begin();
     $body = json_decode($response->getBody(), true);
     $parts = explode('/', $body['commit']);
     $this->transactionId = (int) $parts[count($parts) - 2];
     $this->state = self::OPENED;
     $this->session->transaction = $this;
 }