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``constant`` ============ .. versionadded: 1.12.1 constant now accepts object instances as the second argument. .. versionadded: 1.28 Using ``constant`` with the ``defined`` test was added in Twig 1.28. ``constant`` returns the constant value for a given string: .. code-block:: jinja {{ some_date|date(constant('DATE_W3C')) }} {{ constant('Namespace\\Classname::CONSTANT_NAME') }} As of 1.12.1 you can read constants from object instances as well: .. code-block:: jinja {{ constant('RSS', date) }} Use the ``defined`` test to check if a constant is defined: .. code-block:: jinja {% if constant('SOME_CONST') is defined %} ... {% endif %}