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+``empty``
+=========
+
+.. versionadded:: 1.33
+
+    Support for the ``__toString()`` magic method has been added in Twig 1.33.
+
+``empty`` checks if a variable is an empty string, an empty array, an empty
+hash, exactly ``false``, or exactly ``null``.
+
+For objects that implement the ``Countable`` interface, ``empty`` will check the
+return value of the ``count()`` method.
+
+For objects that implement the ``__toString()`` magic method (and not ``Countable``),
+it will check if an empty string is returned.
+
+.. code-block:: jinja
+
+    {% if foo is empty %}
+        ...
+    {% endif %}
+