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Answers and rating deltas for

Is this php script for updating a logout time in a table correct?

Author Votes Δ
Danny Beckett 1 +2.45
Matt 1 +2.84
Johndave Decano 0 -2.33
SomeKittens 0 -2.95
Last visited: Sep 14, 2014, 5:07:29 AM