form.php

composer.json

{
  "require": {
    "symfony/form": "2.6.2",
    "symfony/http-foundation": "2.6.2",
    "symfony/twig-bridge": "2.3.*"
  }
}

form.php

<?php

use Symfony\Bridge\Twig\Extension\FormExtension;
use Symfony\Bridge\Twig\Form\TwigRenderer;
use Symfony\Bridge\Twig\Form\TwigRendererEngine;
use Symfony\Component\Form\Extension\Core\CoreExtension;
use Symfony\Component\Form\Extension\HttpFoundation\HttpFoundationExtension;
use Symfony\Component\Form\Forms;
use Symfony\Component\HttpFoundation\Request;

require_once __DIR__.'/vendor/autoload.php';

function get_form_factory()
{
    $formFactory = Forms::createFormFactoryBuilder()
        ->addExtension(new HttpFoundationExtension())
        ->addExtension(new CoreExtension())
        ->getFormFactory();

    return $formFactory;
}

function get_twig()
{
    $twig = new Twig_Environment(new Twig_Loader_Array(array(
        'form.html.twig' => '{{ form(form) }}',
        'form_div_layout.html.twig' => file_get_contents('./vendor/symfony/twig-bridge/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig')
    )));
    $formEngine = new TwigRendererEngine(array('form_div_layout.html.twig'));
    $formEngine->setEnvironment($twig);

    $twig->addExtension(
        new FormExtension(new TwigRenderer($formEngine))
    );

    $twig->addFilter(new Twig_SimpleFilter('trans', function ($string) {
        return $string;
    }));

    return $twig;
}

function handle_request(Request $request)
{
    $twig = get_twig();
    $form = get_form_factory()->createBuilder('form')
        ->add('name', 'text')
        ->add('send', 'submit')
        ->getForm();

    if ($request->isMethod('POST')) {
        var_dump($request->request);
        var_dump($request->get('name'));
        var_dump($request->request->get('name'));
    }

    $form->handleRequest($request);

    if($form->isValid()) {
        die('valid!');
    }

    echo $twig->render('form.html.twig', array('form' => $form->createView()));
}

handle_request(Request::createFromGlobals());