升级到 Symfony 4.3 后，我收到以下 22 条弃用警告:

After upgrading to Symfony 4.3, I'm getting the following 22 deprecation warnings:

用户弃用:SymfonyBundleTwigBundleLoaderFilesystemLoader 类自 4.3 版以来已弃用，将在 5.0 中删除；对模板使用 Twig 表示法.

User Deprecated: The SymfonyBundleTwigBundleLoaderFilesystemLoader class is deprecated since version 4.3 and will be removed in 5.0; use Twig notation for templates instead.

用户已弃用:templating.locator" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

User Deprecated: The "templating.locator" service is deprecated since Symfony 4.3 and will be removed in 5.0.

用户弃用:SymfonyBundleFrameworkBundleTemplatingLoaderTemplateLocator 类自 4.3 版以来已弃用，并将在 5.0 中删除；改用 Twig.

User Deprecated: The SymfonyBundleFrameworkBundleTemplatingLoaderTemplateLocator class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

用户已弃用:templating.name_parser" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

User Deprecated: The "templating.name_parser" service is deprecated since Symfony 4.3 and will be removed in 5.0.

用户弃用:SymfonyBundleFrameworkBundleTemplatingTemplateNameParser 类自 4.3 版以来已弃用，将在 5.0 中删除；改用 Twig.

User Deprecated: The SymfonyBundleFrameworkBundleTemplatingTemplateNameParser class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

用户已弃用:使用 模板" 服务自 4.3 版起已弃用，并将在 5.0 中删除；改用 Twig.

User Deprecated: Using the "templating" service is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

用户已弃用:SymfonyBridgeTwigTwigEngine 类自 4.3 版以来已弃用，并将在 5.0 中删除；请改用 TwigEnvironment.

User Deprecated: The SymfonyBridgeTwigTwigEngine class is deprecated since version 4.3 and will be removed in 5.0; use TwigEnvironment instead.

用户弃用:SymfonyBundleFrameworkBundleTemplatingEngineInterface 接口自 4.3 版以来已弃用，将在 5.0 中删除；改用 Twig.

User Deprecated: The SymfonyBundleFrameworkBundleTemplatingEngineInterface interface is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

用户已弃用:SymfonyBundleTwigBundleTwigEngine 类自 4.3 版以来已弃用，并将在 5.0 中删除；请改用 TwigEnvironment.

User Deprecated: The SymfonyBundleTwigBundleTwigEngine class is deprecated since version 4.3 and will be removed in 5.0; use TwigEnvironment instead.

2 次:framework.template" 配置自 Symfony 4.3 起已被弃用.改为配置 Twig Bundle 提供的 twig" 部分.

2 times: The "framework.templating" configuration is deprecated since Symfony 4.3. Configure the "twig" section provided by the Twig Bundle instead.

自 4.3 版起已弃用启用模板组件，并将在 5.0 版中删除；改用 Twig.

Enabling the Templating component is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

templating.cache_warmer.template_paths" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

The "templating.cache_warmer.template_paths" service is deprecated since Symfony 4.3 and will be removed in 5.0.

SymfonyBundleFrameworkBundleCacheWarmerTemplatePathsCacheWarmer 类自 4.3 版起已弃用，并将在 5.0 版中删除；改用 Twig.

The SymfonyBundleFrameworkBundleCacheWarmerTemplatePathsCacheWarmer class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

templating.finder" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

The "templating.finder" service is deprecated since Symfony 4.3 and will be removed in 5.0.

SymfonyBundleFrameworkBundleCacheWarmerTemplateFinder 类自 4.3 版起已弃用，将在 5.0 版中删除；改用 Twig.

The SymfonyBundleFrameworkBundleCacheWarmerTemplateFinder class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

SymfonyBundleFrameworkBundleCacheWarmerTemplateFinderInterface 接口自 4.3 版本起已弃用，并将在 5.0 中删除；改用 Twig.

The SymfonyBundleFrameworkBundleCacheWarmerTemplateFinderInterface interface is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

templating.locator" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

The "templating.locator" service is deprecated since Symfony 4.3 and will be removed in 5.0.

SymfonyBundleFrameworkBundleTemplatingLoaderTemplateLocator 类自 4.3 版起已弃用，将在 5.0 中删除；改用 Twig.

The SymfonyBundleFrameworkBundleTemplatingLoaderTemplateLocator class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

SymfonyBundleFrameworkBundleTemplatingTemplateReference 类自 4.3 版起已弃用，并将在 5.0 版中删除；改用 Twig.

The SymfonyBundleFrameworkBundleTemplatingTemplateReference class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

templating.name_parser" 服务自 Symfony 4.3 起已弃用，并将在 5.0 中删除.

The "templating.name_parser" service is deprecated since Symfony 4.3 and will be removed in 5.0.

SymfonyBundleFrameworkBundleTemplatingTemplateNameParser 类自 4.3 版起已弃用，将在 5.0 中删除；改用 Twig.

The SymfonyBundleFrameworkBundleTemplatingTemplateNameParser class is deprecated since version 4.3 and will be removed in 5.0; use Twig instead.

推荐答案

这是由于模板组件的弃用，请参阅 https://symfony.com/blog/new-in-symfony-4-3-deprecated-the-template-component-integration

This is due to the deprecation of the templating component, see https://symfony.com/blog/new-in-symfony-4-3-deprecated-the-templating-component-integration

解决方案:

templating:
    engines:
        - twig

运行 composer 更新

这应该会删除所有弃用警告.

This should remove all the deprecation warnings.

如果您收到此错误

无法自动装配服务...":方法__construct()"的参数$templating"引用了接口SymfonyBundleFrameworkBundleTemplatingEngineInterface"，但不存在此类服务.您是否创建了实现此接口的类?

Cannot autowire service "...": argument "$templating" of method "__construct()" references interface "SymfonyBundleFrameworkBundleTemplatingEngineInterface" but no such service exists. Did you create a class that implements this interface?

...您仍在某些服务中使用旧模板.解决方法:将依赖从SymfonyBundleFrameworkBundleTemplatingEngineInterface改为TwigEnvironment:

... you're still using the old templating in some service. Solution: Change the dependency from SymfonyBundleFrameworkBundleTemplatingEngineInterface to TwigEnvironment:

use TwigEnvironment;

private $twig;

public function __construct(Environment $twig)
{
    $this->twig = $twig;
}

另见 https://github.com/symfony/symfony/issues/31645