use Symfony\Component\Form\FormBuilderInterface; class MyFormBuilder implements FormBuilderInterface { public function buildForm(FormBuilderInterface $builder, array $options) { // build your form here } public function getFormFactory() { return $this->formFactory; } }In this example, we are implementing the FormBuilderInterface and defining the buildForm and getFormFactory methods. The getFormFactory method returns the form factory instance, which can then be used to create form instances. Overall, the Symfony Component Form library provides a powerful set of tools for building and validating forms programmatically in PHP. By using the FormBuilderInterface and other components provided by the Symfony Form library, developers can quickly and easily create robust forms for their applications.