lower 小写

index.php:
$smarty = new Smarty;
$smarty->assign('articleTitle', 'Two Convicts Evade Noose, Jury Hung.');
$smarty->display('index.tpl');
index.tpl:
{$articleTitle}
{$articleTitle|lower}
OUTPUT:
Two Convicts Evade Noose, Jury Hung.
two convicts evade noose, jury hung.