keys

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License

Twig documentation is licensed under the new BSD license.

`keys`

The keys filter returns the keys of a sequence or a mapping. It is useful when you want to iterate over the keys of a sequence or a mapping:

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        {% for key in ['a', 'b', 'c', 'd']|keys %}
    {{ key }}
{% endfor %}
{# outputs: 0 1 2 3 #}

{% for key in {a: 'a_value', b: 'b_value'}|keys %}
    {{ key }}
{% endfor %}
{# outputs: a b #}
    

Note

Internally, Twig uses the PHP array_keys function.