constant

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 %}

© 2009–2018 by the Twig Team
Licensed under the three clause BSD license.
The Twig logo is © 2010–2020 Symfony
https://twig.symfony.com/doc/2.x/tests/constant.html