2007/12/9, zelulax zelulax@gmail.com:
how can I delete a registered user? I tried using Special:Listusers but I can't see any option available. Do I have to delete the user over MySQL? I have only access to PhpMyAdmin. How do I do that?
AFAIK, it's not possible to delete users without directly meddling with the database, and it's discouraged, too - MediaWiki isn't built to handle that.
In a public wiki, it may also raise questions of attribution for contributions a user made, if any, although that'd probably also depend on the license the wiki's using and the jurisdiction it's covered by (those that recognise moral rights may require attribution even when the license doesn't do so).
I think there's been discussions about this before, though, so looking through the mailing list archives should hopefully turn up more.