keys

You are reading the documentation for Twig 3.x. Switch to the documentation for Twig 1.x. 2.x.

Questions & Feedback

Found a typo or an error?
Want to improve this document? Edit it.

Need support or have a technical question?
Ask support on Stack Overflow.

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:

        1
2
3
4
5
6
7
8
9
        {% 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.