symfony2 twig 白名单 html 标签
我在 Symfony2 中将一个变量传递给我的 twig 模板，这个变量可能包含 <br/> html 标签，我试图创建一个扩展(函数)，但变量仍然得到逃跑了.
I pass a variable to my twig template in Symfony2, this variable may contain <br /> html tags, I have tried to create an extension (function), but the variable still gets escaped.
如何输出允许 <br/> 标签的 twig 变量?是否有一个简单的解决方案只允许某些模板中允许的标签白名单?
How can I output a twig variable that allows the <br /> tag? Is there a simple solution to just allow a whitelist of allowed tags in certain templates?
我搜索过 twig 沙箱，但我不确定这是否是我的解决方案.
I've searched about twig sandboxes, but I'm not sure if that is my solution.
我仍然希望对变量进行转义，但只允许 <br/> 标记.
edit: I still want the variable to be escaped, but to allow exclusively the <br /> tag.
推荐答案
最初我认为应该可以编写自定义转义策略，以便您可以执行以下操作:
Initially I thought it should be possible to write custom escaper strategies so you could do something like this:
{{ var|escape('html-custom') }}
不幸的是，事实并非如此.唯一可用的策略是 html 和 js.它们被硬编码在 Twig_Extension_Core 类文件中定义的 twig_escape_filter() 函数中.
Unfortunately it's not the case. Only available strategies are html and js. They're hard coded in the twig_escape_filter() function defined in a Twig_Extension_Core class file.
看来您唯一的选择是使用新过滤器编写自定义 estension:
It seems that your only option is to write custom estension with a new filter:
{{ var|raw|customescape }}
以下是自定义 twig 扩展的示例以及如何在 Symfony 中注册它:Symfony2 Twig 扩展
Here's an example of custom twig extension and how to register it in Symfony: Symfony2 Twig extension
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