Symfony\Component\DomCrawler\Form::addField PHP Method

    private function addField(\DOMElement $node)
    {
        if (!$node->hasAttribute('name') || !$node->getAttribute('name')) {
            return;
        }

        $nodeName = $node->nodeName;
        if ('select' == $nodeName || 'input' == $nodeName && 'checkbox' == strtolower($node->getAttribute('type'))) {
            $this->set(new Field\ChoiceFormField($node));
        } elseif ('input' == $nodeName && 'radio' == strtolower($node->getAttribute('type'))) {
            // there may be other fields with the same name that are no choice
            // fields already registered (see https://github.com/symfony/symfony/issues/11689)
            if ($this->has($node->getAttribute('name')) && $this->get($node->getAttribute('name')) instanceof ChoiceFormField) {
                $this->get($node->getAttribute('name'))->addChoice($node);
            } else {
                $this->set(new Field\ChoiceFormField($node));
            }
        } elseif ('input' == $nodeName && 'file' == strtolower($node->getAttribute('type'))) {
            $this->set(new Field\FileFormField($node));
        } elseif ('input' == $nodeName && !in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image'))) {
            $this->set(new Field\InputFormField($node));
        } elseif ('textarea' == $nodeName) {
            $this->set(new Field\TextareaFormField($node));
        }
    }