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[yaffs-website] / vendor / twig / twig / doc / functions / constant.rst

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+``constant``
+============
+
+.. versionadded: 1.12.1
+    constant now accepts object instances as the second argument.
+
+.. versionadded: 1.28
+    Using ``constant`` with the ``defined`` test was added in Twig 1.28.
+
+``constant`` returns the constant value for a given string:
+
+.. code-block:: jinja
+
+    {{ some_date|date(constant('DATE_W3C')) }}
+    {{ constant('Namespace\\Classname::CONSTANT_NAME') }}
+
+As of 1.12.1 you can read constants from object instances as well:
+
+.. code-block:: jinja
+
+    {{ constant('RSS', date) }}
+
+Use the ``defined`` test to check if a constant is defined:
+
+.. code-block:: jinja
+
+    {% if constant('SOME_CONST') is defined %}
+        ...
+    {% endif %}