What happens is, the phantom will pop into the chatroom, hang around for a couple seconds, then disappear again. This will happen whether or not I'm logged in.
There is a MySQL table that contains the users currently online. I can empty the table or even recreate it, but the phantom user just pops in again.
This happened about 10 months ago and I killed it by deleting my username and creating a new one. Same name, same password, but the phantom went away and didn't come back until a couple days ago. However, obviously, that's not the most desirable method.
tl;dr: How can I kill this phantom session? Is there any way I can, close my database, restart PHP, or my webservice to kill whatever the connection is? I apologize for not knowing much about how servers work.