是否可以在 Twig 中检查给定变量是否为字符串?

Is it possible to check if given variable is string in Twig ?

预期的解决方案:

messages.en.yml:

hello:
  stranger: Hello stranger !
  known: Hello %name% !

Twig 模板:

{% set title='hello.stranger' %}
{% set title=['hello.known',{'%name%' : 'hsz'}] %}

{% if title is string %}
  {{ title|trans }}
{% else %}
  {{ title[0]|trans(title[1]) }}
{% endif %}

这样可以吗?或者你有更好的解决方案?

Is it possible to do it this way ? Or maybe you have better solution ?

推荐答案

可以通过测试 iterable 来完成，添加在 twig1.7 中，正如 Wouter J 在评论中所说:

Can be done with the test iterable, added in twig1.7, as Wouter J stated in the comment :

{# evaluates to true if the users variable is iterable #}
{% if users is iterable %}
    {% for user in users %}
        Hello {{ user }}!
    {% endfor %}
{% else %}
    {# users is probably a string #}
    Hello {{ users }}!
{% endif %}

参考:iterable