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constant

New in version 1.12.1

constant now accepts object instances as the second argument.

New in version 1.28

Using constant with the defined test was added in Twig 1.28.

constant returns the constant value for a given string:

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{{ 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:

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

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

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