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Ruud Kamphuis
24 lines
530 B
ReStructuredText
24 lines
530 B
ReStructuredText
``keys``
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========
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The ``keys`` filter returns the keys of a sequence or a mapping. It is useful
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when you want to iterate over the keys of a sequence or a mapping:
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.. code-block:: twig
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{% for key in ['a', 'b', 'c', 'd']|keys %}
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{{ key }}
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{% endfor %}
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{# outputs: 0 1 2 3 #}
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{% for key in {a: 'a_value', b: 'b_value'}|keys %}
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{{ key }}
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{% endfor %}
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{# outputs: a b #}
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.. note::
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Internally, Twig uses the PHP `array_keys`_ function.
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.. _`array_keys`: https://www.php.net/array_keys
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