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user_data Issue - El Forum - 01-12-2012

[eluser]Unknown[/eluser]
Hello, I have a huge problem .. For several hours I tried to detected when a user is online. I use the backup session in the database. My problem this time is that I don't know how to retrieve the data in the user_data field in the database.

Does anyone have an idea how I could these data or how I can detect a user that try to connect with the same username as the last but one is already connected.

To make it shot, I don't want multiple login with the same credentials.