Questions answered by this recipe
How come I can logon in FireFox and Internet Explorer at the same time with the same login name?
Can I prevent two people logging in at the same time using the same login name?
When using AuthUser a person can login as many times as they want from different computers and browsers. This recipe will change this so that when someone logs in anyone else with the same user name will be logged out. This gives users incentive to not share their login data with others.
If you are not using PHP version 5 or newer you will need to install recipe PMWCompat.
There are 3 steps to installing OnlyOneLogin.
Use "require" and not "include" - this will deny any access if the security check fails due to server problems. Do not user "require_once" because someone might capture it's Redirect() and make it void. Better check once too often than once too less.
This program is free software. You can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation http://www.fsf.org either version 2 of the License, or (at your option) any later version.
Copyright 2007 by GNUZoo email: guru [snail] gnuzoo [period] org
Please donate to the author at url: http://gnuzoo.org/GNUZooPayPal
- Version 1.4 - Changed page name from YourSessionHasBeenSuperseded to LoginSuperseded
- Version 1.3 - added "if (!defined('PmWiki')) exit();"
- Version 1.2: Initial Release
Sven created initial code