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

    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;
    }