Probably every PHP developer in the world has already seen the following notice at least once: Notice: Undefined index: not_set in /home/.sites/../../../…php on line 1 It happens if accessing the key of an array which does not exist. There is a very similar problem with PHP objects: If you access a property of an object […]

Recently I was confronted with the problem to have multiple user types on a WordPress Blog who needed to be logged in using an external service/authentication mechanism partly. But they all had to use the same login form for the system. A common problem? The WordPress Function Reference and  Codex do not document this topic […]