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+{function} {#language.function.function}
+==========
+
+`{function}` is used to create functions within a template and call them
+just like a plugin function. Instead of writing a plugin that generates
+presentational content, keeping it in the template is often a more
+manageable choice. It also simplifies data traversal, such as deeply
+nested menus.
+
+> **Note**
+>
+> Template functions are defined global. Since the Smarty compiler is a
+> single-pass compiler, The [`{call}`](#language.function.call) tag must
+> be used to call a template function defined externally from the given
+> template. Otherwise you can directly use the function as
+> `{funcname ...}` in the template.
+
+-   The `{function}` tag must have the `name` attribute which contains
+    the the name of the template function. A tag with this name can be
+    used to call the template function.
+
+-   Default values for variables can be passed to the template function
+    as [attributes](#language.syntax.attributes). Like in PHP function
+    declarations you can only use scalar values as default. The default
+    values can be overwritten when the template function is being
+    called.
+
+-   You can use all variables from the calling template inside the
+    template function. Changes to variables or new created variables
+    inside the template function have local scope and are not visible
+    inside the calling template after the template function is executed.
+
+**Attributes:**
+
+   Attribute Name       Type       Required   Default  Description
+  ---------------- -------------- ---------- --------- ---------------------------------------------------------------
+        name           string        Yes       *n/a*   The name of the template function
+    \[var \...\]    \[var type\]      No       *n/a*   default variable value to pass local to the template function
+
+> **Note**
+>
+> You can pass any number of parameter to the template function when it
+> is called. The parameter variables must not be declared in the
+> `{funcname ...}` tag unless you what to use default values. Default
+> values must be scalar and can not be variable. Variables must be
+> passed when the template is called.
+
+
+    {* define the function *}
+    {function name=menu level=0}
+    {function menu level=0}          {* short-hand *}
+      <ul class="level{$level}">
+      {foreach $data as $entry}
+        {if is_array($entry)}
+          <li>{$entry@key}</li>
+          {menu data=$entry level=$level+1}
+        {else}
+          <li>{$entry}</li>
+        {/if}
+      {/foreach}
+      </ul>
+    {/function}
+
+    {* create an array to demonstrate *}
+    {$menu = ['item1','item2','item3' => ['item3-1','item3-2','item3-3' =>
+    ['item3-3-1','item3-3-2']],'item4']}
+
+    {* run the array through the function *}
+    {menu data=$menu}
+
+      
+
+Will generate the following output
+
+
+    * item1
+    * item2
+    * item3
+          o item3-1
+          o item3-2
+          o item3-3
+                + item3-3-1
+                + item3-3-2
+    * item4
+
+      
+
+See also [`{call}`](#language.function.call)