constant

New in version 1.13.1: constant now accepts object instances as the second argument.

constant checks if a variable has the exact same value as a constant. You can use either global constants or class constants:

{% if post.status is constant('Post::PUBLISHED') %}
    the status attribute is exactly the same as Post::PUBLISHED
{% endif %}

You can test constants from object instances as well:

{% if post.status is constant('PUBLISHED', post) %}
    the status attribute is exactly the same as Post::PUBLISHED
{% endif %}
« Tests | defined »

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https://twig.symfony.com/doc/1.x/tests/constant.html