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EDIT :: AlternatingRowType.php

<?php namespace Symfony\Component\Form\Tests\Fixtures; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\FormEvents; use Symfony\Component\Form\FormEvent; use Symfony\Component\Form\FormBuilderInterface; class AlternatingRowType extends AbstractType { public function buildForm(FormBuilderInterface $builder, array $options) { $formFactory = $builder->getFormFactory(); $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) use ($formFactory) { $form = $event->getForm(); $type = $form->getName() % 2 === 0 ? 'text' : 'textarea'; $form->add('title', $type); }); } public function getName() { return 'alternating_row'; } }

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