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+Template Functions {#plugins.functions}
+==================
+
+void
+
+smarty\_function\_
+
+name
+
+array
+
+\$params
+
+object
+
+\$template
+
+All [attributes](#language.syntax.attributes) passed to template
+functions from the template are contained in the `$params` as an
+associative array.
+
+The output (return value) of the function will be substituted in place
+of the function tag in the template, eg the
+[`{fetch}`](#language.function.fetch) function. Alternatively, the
+function can simply perform some other task without any output, eg the
+[`{assign}`](#language.function.assign) function.
+
+If the function needs to assign some variables to the template or use
+some other Smarty-provided functionality, it can use the supplied
+`$template` object to do so eg `$template->foo()`.
+
+
+    <?php
+    /*
+     * Smarty plugin
+     * -------------------------------------------------------------
+     * File:     function.eightball.php
+     * Type:     function
+     * Name:     eightball
+     * Purpose:  outputs a random magic answer
+     * -------------------------------------------------------------
+     */
+    function smarty_function_eightball($params, Smarty_Internal_Template $template)
+    {
+        $answers = array('Yes',
+                         'No',
+                         'No way',
+                         'Outlook not so good',
+                         'Ask again soon',
+                         'Maybe in your reality');
+
+        $result = array_rand($answers);
+        return $answers[$result];
+    }
+    ?>
+
+which can be used in the template as:
+
+    Question: Will we ever have time travel?
+    Answer: {eightball}.
+        
+
+
+    <?php
+    /*
+     * Smarty plugin
+     * -------------------------------------------------------------
+     * File:     function.assign.php
+     * Type:     function
+     * Name:     assign
+     * Purpose:  assign a value to a template variable
+     * -------------------------------------------------------------
+     */
+    function smarty_function_assign($params, Smarty_Internal_Template $template)
+    {
+        if (empty($params['var'])) {
+            trigger_error("assign: missing 'var' parameter");
+            return;
+        }
+
+        if (!in_array('value', array_keys($params))) {
+            trigger_error("assign: missing 'value' parameter");
+            return;
+        }
+
+        $template->assign($params['var'], $params['value']);     
+        
+    }
+    ?>
+
+          
+
+See also: [`registerPlugin()`](#api.register.plugin),
+[`unregisterPlugin()`](#api.unregister.plugin).