I found the solution

I set an username on an variable, and after Logout this variable i set
to null

:)

if(!empty($username)) {
  echo $html->link('Logout', array
('controller'=>'users','action'=>'logout'));
} else {
  echo $html->link('Login', array
('controller'=>'users','action'=>'login'));
}
?>

many greetings

Marcus Radisch
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