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

{% if myVar is in_array(array_keys(someOtherArray)) %} # or {% if myVar in someOtherArray|keys %} 

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

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

{% if myVar is in_array(array_keys(someOtherArray)) %} # or {% if myVar in someOtherArray|keys %} 

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

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.

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

{% if myVar is in_array(array_keys(someOtherArray)) %} # or {% if myVar in someOtherArray|keys %} 

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

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.

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.