<?php $aText = array(
1 => '<h1>random header 1</h1> <p>random text 1</p>',
2 => '<ul><li>random list 1</li></ul>',
3 => 'whatever you want to put here');

$iNumText = count($aText);

echo $aText[rand(1, $iNumText)];
?>

Refresh page to see rotator in action.