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``constant``
============
.. versionadded:: 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:
.. code-block:: twig
{% 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:
.. code-block:: twig
{% if post.status is constant('PUBLISHED', post) %}
the status attribute is exactly the same as Post::PUBLISHED
{% endif %}