Google\Cloud\Datastore\Connection\Rest::__construct PHP Method

    public function __construct(array $config = [])
    {
        $emulatorHost = getenv('DATASTORE_EMULATOR_HOST');
        $baseUri = $this->getEmulatorBaseUri(self::BASE_URI, $emulatorHost);
        $config += ['serviceDefinitionPath' => __DIR__ . '/ServiceDefinition/datastore-v1.json'];
        $this->setRequestWrapper(new RequestWrapper($config));
        $this->setRequestBuilder(new RequestBuilder($config['serviceDefinitionPath'], $baseUri));
    }