表单组件

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use Symfony\Component\Form\Extension\Csrf\CsrfExtension;
use Symfony\Component\Form\Forms;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\Security\Csrf\CsrfTokenManager;
use Symfony\Component\Security\Csrf\TokenGenerator\UriSafeTokenGenerator;
use Symfony\Component\Security\Csrf\TokenStorage\SessionTokenStorage;

// creates a RequestStack object using the current request
$requestStack = new RequestStack([$request]);

$csrfGenerator = new UriSafeTokenGenerator();
$csrfStorage = new SessionTokenStorage($requestStack);
$csrfManager = new CsrfTokenManager($csrfGenerator, $csrfStorage);

$formFactory = Forms::createFormFactoryBuilder()
    // ...
    ->addExtension(new CsrfExtension($csrfManager))
    ->getFormFactory();

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use Symfony\Bridge\Twig\Extension\FormExtension;
use Symfony\Bridge\Twig\Form\TwigRendererEngine;
use Symfony\Component\Form\FormRenderer;
use Symfony\Component\Form\Forms;
use Twig\Environment;
use Twig\Loader\FilesystemLoader;
use Twig\RuntimeLoader\FactoryRuntimeLoader;

// the Twig file that holds all the default markup for rendering forms
// this file comes with TwigBridge
$defaultFormTheme = 'form_div_layout.html.twig';

$vendorDirectory = realpath(__DIR__.'/../vendor');
// the path to TwigBridge library so Twig can locate the
// form_div_layout.html.twig file
$appVariableReflection = new \ReflectionClass('\Symfony\Bridge\Twig\AppVariable');
$vendorTwigBridgeDirectory = dirname($appVariableReflection->getFileName());
// the path to your other templates
$viewsDirectory = realpath(__DIR__.'/../views');

$twig = new Environment(new FilesystemLoader([
    $viewsDirectory,
    $vendorTwigBridgeDirectory.'/Resources/views/Form',
]));
$formEngine = new TwigRendererEngine([$defaultFormTheme], $twig);
$twig->addRuntimeLoader(new FactoryRuntimeLoader([
    FormRenderer::class => function () use ($formEngine, $csrfManager): FormRenderer {
        return new FormRenderer($formEngine, $csrfManager);
    },
]));

// ... (see the previous CSRF Protection section for more information)

// adds the FormExtension to Twig
$twig->addExtension(new FormExtension());

// creates a form factory
$formFactory = Forms::createFormFactoryBuilder()
    // ...
    ->getFormFactory();

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use Symfony\Bridge\Twig\Extension\TranslationExtension;
use Symfony\Component\Form\Forms;
use Symfony\Component\Translation\Loader\XliffFileLoader;
use Symfony\Component\Translation\Translator;

// creates the Translator
$translator = new Translator('en');
// somehow load some translations into it
$translator->addLoader('xlf', new XliffFileLoader());
$translator->addResource(
    'xlf',
    __DIR__.'/path/to/translations/messages.en.xlf',
    'en'
);

// adds the TranslationExtension (it gives us trans filter)
$twig->addExtension(new TranslationExtension($translator));

$formFactory = Forms::createFormFactoryBuilder()
    // ...
    ->getFormFactory();

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use Symfony\Component\Form\Extension\Validator\ValidatorExtension;
use Symfony\Component\Form\Forms;
use Symfony\Component\Validator\Validation;

$vendorDirectory = realpath(__DIR__.'/../vendor');
$vendorFormDirectory = $vendorDirectory.'/symfony/form';
$vendorValidatorDirectory = $vendorDirectory.'/symfony/validator';

// creates the validator - details will vary
$validator = Validation::createValidator();

// there are built-in translations for the core error messages
$translator->addResource(
    'xlf',
    $vendorFormDirectory.'/Resources/translations/validators.en.xlf',
    'en',
    'validators'
);
$translator->addResource(
    'xlf',
    $vendorValidatorDirectory.'/Resources/translations/validators.en.xlf',
    'en',
    'validators'
);

$formFactory = Forms::createFormFactoryBuilder()
    // ...
    ->addExtension(new ValidatorExtension($validator))
    ->getFormFactory();

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$form = ...;

// ...

// a FormErrorIterator instance, but only errors attached to this
// form level (e.g. global errors)
$errors = $form->getErrors();

// a FormErrorIterator instance, but only errors attached to the
// "firstName" field
$errors = $form['firstName']->getErrors();

// a FormErrorIterator instance including child forms in a flattened structure
// use getOrigin() to determine the form causing the error
$errors = $form->getErrors(true);

// a FormErrorIterator instance including child forms without flattening the output structure
$errors = $form->getErrors(true, false);