note 25983 added to features.http-auth

I encountered the same problem:cannot log out. My first solution is to use another session variable "isLogged" to help Authorizing.when user clicks the Logout hyperlink, set the variable to "false".the user can pass the authorization only when $PHP_AUTH_USER is set and $isLogged is also "true" .But this is a solution with too many backdoors.Is there a way to make $PHP_AUTH_USER unset? -- http://www.php.net/manual/en/features.http-auth.php http://master.php.net/manage/user-notes.php?action=edit+25983 http://master.php.net/manage/user-notes.php?action=delete+25983 http://master.php.net/manage/user-notes.php?action=reject+25983