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constantΒΆ

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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