Twig: in_array or similar possible within if statement?

Try this

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

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

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

{% if myVar in someOtherArray|keys %}

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

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 %}

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