constant

The constant function returns the constant value for a given string.

{{ some_date | date(constant('DATE_W3C')) }}

You can read constants from object instances as well:

{{ constant('RSS', date) }}

Use the defined test to check if a constant is defined:

{% if constant('SOME_CONST') is defined %}
  ...
{% endif %}

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cms

The cms function allows you to retrieve CMS content.

cycle

The cycle function cycles on an array of values.