How to access class constants in Twig?

Just to save your time. If you need to access class constants under namespace, use

{{ constant('Acme\\DemoBundle\\Entity\\Demo::MY_CONSTANT') }}

php templates twig

{% if var == constant('Namespace\\Entity::TYPE_PERSON') %}{# or #}{% if var is constant('Namespace\\Entity::TYPE_PERSON') %}

See documentation for the constant function and the constant test.

php templates twig

As of 1.12.1 you can read constants from object instances as well:

{% if var == constant('TYPE_PERSON', entity)

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