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