SplDatastructure format: sections.

>>>>templates/test.tpl
<opt:section name="foo">
{$foo.item}
</opt:section>

>>>>data.php

$spl1 = new SplDoublyLinkedList;
$spl1->push(array('item' => 'FOO'));
$spl1->push(array('item' => 'BAR'));

$view->foo = $spl1;
$view->setFormat('foo', 'SplDatastructure');

>>>>expected.txt
OUTPUT

>>>>result.txt
FOO
BAR