constant

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`constant`

constant returns the constant value for a given string:

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        {{ some_date|date(constant('DATE_W3C')) }}
{{ constant('Namespace\\Classname::CONSTANT_NAME') }}
    

You can read constants from object instances as well:

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

Retrieve the fully qualified class name of an object:

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

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

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