Twig: in_array or similar possible within if statement?

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 hav开发者_JAVA技巧e 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!

---

You just have to change the second line of your second code-block from

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

to

{% if myVar in someOtherArray|keys %}

in is the containment-operator and keys a filter that returns an arrays keys.

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Just to clear some things up here. The answer that was accepted does not do the same as PHP in_array.

To do the same as PHP in_array use following expression:

{% if myVar in myArray %}

If you want to negate this you should use this:

{% if myVar not in myArray %}

---

Try this

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

---

another example following @jake stayman:

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

---

Though The above answers are right, I found something more user-friendly approach while using ternary operator.

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

If someone need to work through foreach then,

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

---

It should help you.

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

More info: http://twig.sensiolabs.org/doc/tags/for.html

---

Here's one to complete the answers with all the possibilities of Twig these days:

To achieve something like this:

{% 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)}

You could also use array mapping and have the following one-liner:
^{(Twig >= 1.41 or >= 2.10 or any 3.x version)}

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

Which outputs something quite similar.

Also see this Twig fiddle: https://twigfiddle.com/dlxj9g

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{% if myVar in myArray %} without keys helps me