Iīm trying to reauthenticate users using PHP3 but variables like PHP_AUTH_USER canīt be unset. The only I have achieved is to obligue the user to change his name or his password using the Hidden element. However, if he doesnīt change anything the dialog box pops up until the Cancel button is pressed.

Is possible to define variables like PHP_AUTH _USER that last until the session is closed?
If not, is possible to reauthenticate?