public function gateway($gateway = 'web')
    {
        if (!isset($this->drivers)) {
            throw new InvalidArgumentException('Driver is not defined.');
        }
        return $this->gateways = $this->createGateway($gateway);
    }
public function gateway($gateway = 'web')
    {
        if (!isset($this->drivers)) {
            throw new InvalidArgumentException('Driver is not defined.');
        }
        return $this->gateways = $this->createGateway($gateway);
    }
public function gateway ( $ gateway = 'web' ) { if ( ! isset ( $ this -> drivers ) ) { throw new InvalidArgumentException ( 'Driver is not defined.' ) ; } return $ this -> gateways = $ this -> createGateway ( $ gateway ) ; }
指定操作网关
@param string $gateway
@return GatewayInterface
指定操作网关