'Twig_Error_Syntax'，消息未知“form_start”函数

Question

是否可以使用symfony3和twig制作独立表单？我无法理解这个错误：

  

致命错误：未捕获的异常'Twig_Error_Syntax'，消息'未知'，form_start“函数在”new.html.twig“第1行

3.1 documentation引用this example，效果很好，但它实际上是使用2.7

我的简单项目是这样组织的：

.
├── composer.json
├── composer.lock
├── src
│   └── form.php
├── vendor
│   └── ...
└── views
    └── new.html.twig

form.php

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

use Symfony\Component\Form\Forms;
use Symfony\Bridge\Twig\Extension\FormExtension;
use Symfony\Bridge\Twig\Form\TwigRenderer;
use Symfony\Bridge\Twig\Form\TwigRendererEngine;

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

$vendorDir = 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');
$vendorTwigBridgeDir = dirname($appVariableReflection->getFileName());
// the path to your other templates
$viewsDir = realpath(__DIR__.'/../views');

$twig = new Twig_Environment(new Twig_Loader_Filesystem(array(
    $viewsDir,
    $vendorTwigBridgeDir.'/Resources/views/Form',
)));
$formEngine = new TwigRendererEngine(array($defaultFormTheme));
$formEngine->setEnvironment($twig);

// create your form factory as normal
$formFactory = Forms::createFormFactoryBuilder()
    ->getFormFactory();

use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\DateType;

$form = $formFactory->createBuilder()
    ->add('task', TextType::class)
    ->add('dueDate', DateType::class)
    ->getForm();

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

new.html.twig

{{ form_start(form) }}
    {{ form_widget(form) }}

    <input type="submit" />
{{ form_end(form) }}

composer.json

{
    "require": {
        "symfony/form": "^3.1",
        "symfony/twig-bridge": "^3.1",
        "twig/twig": "^1.24"
    }
}

完整错误堆栈跟踪

Fatal error: Uncaught exception 'Twig_Error_Syntax' with message 'Unknown "form_start" function in "new.html.twig" at line 1.' in /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php:574
Stack trace:
#0 /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php(351): Twig_ExpressionParser->getFunctionNodeClass('form_start', 1)
#1 /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php(144): Twig_ExpressionParser->getFunctionNode('form_start', 1)
#2 /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php(84): Twig_ExpressionParser->parsePrimaryExpression()
#3 /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php(41): Twig_ExpressionParser->getPrimary()
#4 /var/www/a/forms/vendor/twig/twig/lib/Twig/Parser.php(144): Twig_ExpressionParser->parseExpression()
#5 /var/www/a/forms/vendor/twig/twig/lib/Twig/Parser.php(100): Twig_Parser->subparse(NULL, false)
#6 /var/www/a/forms/vendor/twig/twig/lib/Twig/Environment.php(619): Twig_Parser->parse(Object(Twig_TokenStream))
#7 /var/www/a/forms/ in /var/www/a/forms/vendor/twig/twig/lib/Twig/ExpressionParser.php</b> on line 574

Answer 1

您是否尝试过as per the exemple you provided将扩展程序FormExtension添加到Twig_Environment？

在初始化$twig和$formEngine变量后立即添加以下代码段：

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

然后，您会收到有关trans()未知的错误消息。通过添加symfony/translation包$ composer require symfony/translation来纠正此问题。

然后让Twig以与上面​​相同的方式了解这个新扩展：

$twig->addExtension(
    new TranslationExtension(new Translator('en'))
);

不要忘记用途：

use Symfony\Bridge\Twig\Extension\TranslationExtension;
use Symfony\Component\Translation\Translator;