How to work with setcookie in Twig?

Question

Twig

Guys, started working with Twig. There was a problem with cookies and session (Warning: Cannot modify header information - headers already sent by).
There was no such thing before (CMS / engine is mine, self-written), I switch to Twig.
Having figured it out, I realized that setcookie was fooling my head. Question: How to work with setcookie in Twig ?
Close bracket error:

setcookie(
        "gkl",         
        $VisitUser,        
        time()+2*24*60*60,     
        "/"                   
    );

There is also an error on closing brackets:

echo $twig->render('index.html', array('title' => $title,
                     'description' => $description,
                     'keywords' => $keywords,
 ));

Thanks for any hints and hints.

Answer 1

Hmm...