parameterBag = $parameterBag; } public function addCaptchaType(FormBuilderInterface $builder) { $builder->add('specialField', HiddenType::class, [ 'data' => 0, 'mapped' => false, 'attr' => [ 'class' => 'special-field' ], 'constraints' => [ new NotNull(), new EqualTo(['value' => $this->parameterBag->get('app.captcha_value'), 'message' => 'Valeur incorrecte']) ], ]); } }