{* define the function *} {function name=menu level=0} <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}