test.php
<?php
require_once('tiki-setup.php');
$myArray = array(1,2,3,4,5);
$smarty->assign('myArray', $myArray);
$smarty->display('test.tpl');

templates/test.tpl
{foreach from=$myArray item=i name=foo}
{cycle name=outsideif values="a,b"}
{if !$smarty.foreach.foo.last}{cycle name=insideif values="c,d"}{/if}
{/foreach}