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 %}