Symfony\Bundle\SecurityBundle\Tests\Functional\Bundle\FormLoginBundle\Controller\LoginController::loginAction PHP Method

    public function loginAction()
    {
        // get the login error if there is one
        if ($this->container->get('request')->attributes->has(SecurityContext::AUTHENTICATION_ERROR)) {
            $error = $this->container->get('request')->attributes->get(SecurityContext::AUTHENTICATION_ERROR);
        } else {
            $error = $this->container->get('request')->getSession()->get(SecurityContext::AUTHENTICATION_ERROR);
        }

        return $this->container->get('templating')->renderResponse('FormLoginBundle:Login:login.html.twig', array(
            // last username entered by the user
            'last_username' => $this->container->get('request')->getSession()->get(SecurityContext::LAST_USERNAME),
            'error'         => $error,
        ));
    }