Symfony\Component\Form\Form::normToClient PHP Метод

    private function normToClient($value)
    {
        if (!$this->clientTransformers) {
            // Scalar values should always be converted to strings to
            // facilitate differentiation between empty ("") and zero (0).
            return null === $value || is_scalar($value) ? (string) $value : $value;
        }

        foreach ($this->clientTransformers as $transformer) {
            $value = $transformer->transform($value);
        }

        return $value;
    }