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Answers and rating deltas for

Can I get feedback on this PHP function that tests if a user has signed up?

Author Votes Δ
Peter Stone 1 +3.46
Bobby Jack 0 -1.24
Cameron 0 -1.30
Paul Nathan 0 -0.02
Dana the Sane 0 -0.09
Last visited: Sep 14, 2014, 5:07:29 AM