require('Smarty.class.php');
$smarty = new Smarty;

$smarty->caching = true;

// clear all caches with "sports|basketball" as the first two cache_id groups
$smarty->clear_cache(null,"sports|basketball");
// www.gitbook.net/smarty
// clear all caches with "sports" as the first cache_id group. This would
// include "sports|basketball", or "sports|(anything)|(anything)|(anything)|..."
$smarty->clear_cache(null,"sports");

$smarty->display('index.tpl',"sports|basketball");