escape

index.php:

$smarty = new Smarty;
$smarty->assign('articleTitle', "'Stiff Opposition Expected to Casketless Funeral Plan'");
$smarty->display('index.tpl');

index.tpl:

{$articleTitle}
{$articleTitle|escape}
{$articleTitle|escape:"html"}    {* защищает  & " ' < > *}
{$articleTitle|escape:"htmlall"} {* защищает все ВСЕ html объекты *}
{$articleTitle|escape:"url"}
{$articleTitle|escape:"quotes"}
<a
href="mailto:{$EmailAddress|escape:"hex"}">{$EmailAddress|escape:"hexentity"}</a>

OUTPUT:

'Stiff Opposition Expected to Casketless Funeral Plan'
'Stiff%20Opposition%20Expected%20to%20Casketless%20Funeral%20Plan'
'Stiff%20Opposition%20Expected%20to%20Casketless%20Funeral%20Plan'
'Stiff%20Opposition%20Expected%20to%20Casketless%20Funeral%20Plan'
'Stiff+Opposition+Expected+to+Casketless+Funeral+Plan'
\'Stiff Opposition Expected to Casketless Funeral Plan\'
<a
href="mailto:%62%6f%62%40%6d%65%2e%6e%65%74">&#x62;&#x6f;&#x62;&#x40;&#x6d;&#x65;&#x2e;&#x6e;&#x65;&#x74;</a>