--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ * (c) Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ *
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_FunctionInterface
+{
+ /**
+ * Compiles a function.
+ *
+ * @return string The PHP code for the function
+ */
+ public function compile();
+
+ public function needsEnvironment();
+
+ public function needsContext();
+
+ public function getSafe(Twig_Node $filterArgs);
+
+ public function setArguments($arguments);
+
+ public function getArguments();
+}