Twig

The flexible, fast, and secure
template engine for PHP

a Symfony Product
Docs Filters 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 [1, 2, 3, 4]|keys %}
    {{ key }}
{% endfor %}
{# outputs: 1 2 3 4 #}

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

Note

Internally, Twig uses the PHP array_keys function.