Symfony2 : use translator in a twig filter extension

Question

我正在尝试在这样的自定义 Twig 过滤器中使用翻译

public function formatTime($timestamp)
{
    $str = date('j %\m%',$timestamp);
    $str = str_replace($str, '%m%', $this->get('translator')->trans('month'.date('m', $timestamp) ) );
    return $str;
}

offcourse get 是未知功能。
我应该让我的扩展了解环境还是简单地请求翻译类以使其可用？

Answer 1

您可以注入(inject) translator服务到你的类(class):

<service id="acme.extension" class="Acme\Twig\Extensions\FormatterExtension">
    <tag name="twig.extension"/>
    <argument type="service" id="translator"/>
</service>

然后将翻译器的实例存储在 protected 字段中并稍后使用:

public function formatTime($timestamp)
{
    $str = date('j %\m%',$timestamp);
    $str = str_replace($str, '%m%', $this->translator->trans('month'.date('m', $timestamp) ) );
    return $str;
}

UPD1: YAML 服务定义的配置:

acme.extension:
    class: Acme\Twig\Extensions\FormatterExtension
    arguments: [@translator]
    tags:
        - name: twig.extension