{$sf->link_to('add to cart','shoppingCart/add?id=%s','confirm=Are you sure?',$id)}

<?php
//compiler.sf.php
function smarty_compiler_sf($tag_attrs, &$compiler)
{
    $_params = $compiler->_parse_attrs($tag_attrs);

    if (!isset($_params['helper'])) {
        $compiler->_syntax_error("sf: missing 'helper' parameter", E_USER_WARNING);
        return;
    }
	
    $helper = $_params['helper'];
	
    return "echo $helper";
}
?>

{sf helper="link_to('my link','somewhere/action?id='.$id,array('some'=>'options','go'=>'here'))"}

<?php echo link_to('my link', 'somewhere/action?id='.$id,array('some'=>'options','go'=>'here')) ?>

{sf helper="symfony_helpers_galore(...)"}

<?php
//compiler.sf.php
function smarty_compiler_sf($tag_attrs, &$compiler)
{
	$_sf = trim($tag_attrs); //removes leading space
	return "echo $_sf";
}
?>

{sf link_to('my link','somewhere/action?id='.$id,array('some'=>'options','go'=>'here'))}

<?php echo link_to('my link', 'somewhere/action?id='.$id,array('some'=>'options','go'=>'here')) ?>

{sf}link_to('my link','somewhere/action?id='.$id,array('some'=>'options','go'=>'here')){/sf}

{link_to url="user/list"}List of users{/link_to}

instead of :
{$sf->link_to("List of users", "user/list")}

{t}Hello World{/t}

instead of:
{$sf->__("Hello World")}

function myhelper($foo, $bar=null)
{
  // some code here
}

function smarty_function_myhelper($params, &$smarty) {
  if ( !isset($params["foo"]) ) {
    $smarty->trigger_error("myhelper: missing 'foo' parameter");
    return;
  }
  if ( !isset($params["bar"]) ) {
    $params["bar"] = null;
  }
  myhelper($params["foo"], $params["bar"]);
}

{sf link_to(...)}

{link_to url="my/action"}text{/link_to}