twig - Twig: in_array or similar possible within if statement?

Question

I am using Twig as templating engine and I am really loving it. However, now I have run in a situation which definitely mustbe accomplishable in a simpler way than I have found.

What I have right now is this:

{% for myVar in someArray %}    
    {% set found = 0 %}
    {% for id, data in someOtherArray %}
        {% if id == myVar %}
            {{ myVar }} exists within someOtherArray.
            {% set found = 1 %} 
        {% endif %}
    {% endfor %}

    {% if found == 0 %}
        {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

What I am looking for is something more like this:

{% for myVar in someArray %}    
    {% if myVar is in_array(array_keys(someOtherArray)) %}
       {{ myVar }} exists within someOtherArray.
    {% else %}
       {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

Is there a way to accomplish this which I haven't seen yet?

If I need to create my own extension, how can I access myVar within the test function?

Thanks for your help!

Answer 1

您只需将第二个代码块的第二行从

{% if myVar is in_array(array_keys(someOtherArray)) %}

至

{% if myVar in someOtherArray|keys %}

in是包含操作符，而keys是一个返回数组键的过滤器。

Answer 2

只是为了清除这里的一些东西。被接受的答案与 PHP in_array不同。

要执行与 PHP in_array相同的操作，请使用以下表达式：

{% if myVar in myArray %}

如果你想否定这个，你应该使用这个：

{% if myVar not in myArray %}

Answer 3

尝试这个

{% if var in ['foo', 'bar', 'beer'] %}
    ...
{% endif %}

Answer 4

@jakestayman 之后的另一个例子：

{% for key, item in row.divs %}
    {% if (key not in [1,2,9]) %} // eliminate element 1,2,9
        <li>{{ item }}</li>
    {% endif %}
{% endfor %}

Answer 5

虽然上面的答案是正确的，但我在使用三元运算符时发现了一些更人性化的方法。

{{ attachment in item['Attachments'][0] ? 'y' : 'n' }}

如果有人需要通过foreach工作，

{% for attachment in attachments %}
    {{ attachment in item['Attachments'][0] ? 'y' : 'n' }}
{% endfor %}

Answer 6

它应该可以帮助你。

{% for user in users if user.active and user.id not 1 %}
   {{ user.name }}
{% endfor %}

更多信息：http ://twig.sensiolabs.org/doc/tags/for.html

Answer 7

这些天来，这里有一个用 Twig 的所有可能性来完成答案：

要实现这样的目标：

{% for myVar in someArray %}    
    {% if myVar in someOtherArray|keys %}
       {{ myVar }} exists within someOtherArray.
    {% else %}
       {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

^{（https://twigfiddle.com/0b5crp）}

您还可以使用数组映射并具有以下单行：
^{（Twig >= 1.41 或 >= 2.10 或任何 3.x 版本）}

{{ someArray|map(myVar => myVar ~ (myVar not in someOtherArray|keys ? ' doesn\'t') ~ ' exists within someOtherArray.')|join('\n') }}

它输出的东西非常相似。

另请参阅此 Twig fiddle：https ://twigfiddle.com/dlxj9g