User validation pattern in PHP with Smarty -

i using php , smarty. have simple application that:

• shows page header
• checks if user logged in -> check session
• checks if user wants log out -> clear session
• if logged in shows menu.
• if not logged in, challenges user id/password -> set session
• shows page footer

now want add following header:

• username if logged in
• "login" string if not logged in

to seems require placement of printheader function become complicated. cannot print header, until know if user logged in/just logged in/has logged out, plus header has go before user/password challenge.

what approach can use here? possible buffer "not logged in" header, replace "logged if header" if required.

smartyapp::printheader();  application->isloggedin() application->doesuserwantstologout() application->ifnotloggedinthenshowchallengetouser() application->ifloggedinthenshowfullmenu()  smartyapp::printfooter(); 

i think more convenient pattern incorporate conditions within templates themselves, rather keeping multiple templates each possible outcome. example:

$smarty->assign('user', new user($_session)); $smarty->display('index.tpl');   <!-- header.tpl --> {if $user->islogged()}     <p>welcome {$username}</p> {else}     <p>please log in</p> {/if}   <!-- body.tpl --> {if $user->islogged()}     {include file="menu.tpl"} {else}     <p>you must signed in view menu</p> {/if}  <!-- index.tpl --> {include file="header.tpl"} {include file="body.tpl"} {include file="footer.tpl"}