由网友(才下眉頭ぃ卻上心頭)分享简介：我有一个变量数组，我想在 Twig 模板中显示，每个变量可以是字符串或日期.I have an array of variables that I want to display in a Twig template and each variable can be either a string or a date...

我有一个变量数组，我想在 Twig 模板中显示，每个变量可以是字符串或日期.

I have an array of variables that I want to display in a Twig template and each variable can be either a string or a date.

如果变量是日期，我想像这样应用 date 过滤器:

If the variable is a date, I want to apply the date filter like this:

{{ my_var|date('d/m/Y') }}

如果它是一个字符串，我希望它以通常的方式显示它:

And if it's a string I want it to display it the usual way:

{{ my_var }}

有什么方法可以测试变量是否为日期(即 PHP DateTime 对象的实例)?

Is there any way to test if a variable is a date (ie. an instance of the PHP DateTime object)?

推荐答案

也许不是最好的方法，但我找到了解决问题的方法.

Maybe not the best way to do it, but I found a solution to my problem.

{% if my_var.timestamp is defined %}
    {{ my_var|date('m/d/Y') }}
{% else %}
    {{ my_var }}
{% endif %}

作为 DateTime PHP 对象有一个公共的 getTimestamp 方法，这是一种检查变量是否为日期的方法，无论该属性是否设置.

As a DateTime PHP object has a public getTimestamp method, it's a way to check if the variable is a date whether this property is set or not.