A smarty about the problem of a hero

Ask your heroes a smarty question
Title, here is the source code:
index.php:
Include ' main.inc.php ';
Header ("Content-type:text/html;charset=utf-8");
$SM->assign ("Time", Date ("y-m-d h-i-s"));
Class user{
function Smarty_function_myname ($param,& $smarty) {
if (Isset ($param [' name '])) {
if ("xxx" = = $param [' name ']) {
Return "I Know".
}else {
Return "I don't know you!";
}
}
}
}
$user = new User ();
$sm->register_function ("MyName", Array ($user, "smarty_function_myname"));
$sm->display ("Index.tpl");
?>
--------------------------------------------------------------------
INDEX.TPL:




<title>Insert Title here</title>


<{myname name= "xxx"}>


----------------------------------------------------
Why access to index.php has been an error, errors are as follows:
Fatal error:call to undefined function smarty_function_myname () in f:\appserv\www\demo\templates_c\%%45^45e^45e480cd% %index.tpl.php on line 12

PS: If index.php is replaced as follows, it can be used normally:
Include ' main.inc.php ';
Header ("Content-type:text/html;charset=utf-8");
function Smarty_function_myname ($param,& $smarty) {
$param is an array of attributes when using the <{myname}> function
if (Isset ($param [' name '])) {
if ("Xu Xiao shrimp" = = $param [' name ']) {
Return "I Know". Date ("y-m-d h-i-s");
}else {
Return "I don't know you!";
}
}
}

$sm->register_function ("MyName", "smarty_function_myname");
$sm->display ("Index.tpl");
?>
Ask the high finger to teach ...

------Solution--------------------
Do not understand ~ ~ are used in PHP processing, with Smarty display only ~
Array (& $object, $method) Form, where & $object is a reference to an object, and $method is a method of it;
Will it be $sm->register_function ("MyName", Array (& $user, "Smarty_function_myname"))?

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