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Answers and rating deltas for

Can anyone explain the following PHP Code?

Author Votes Δ
MitMaro 3 +3.98
Mercer Traieste 2 +1.66
rmontagud 2 +1.36
Tim 1 -2.36
blparker 0 -3.97
Last visited: Sep 14, 2014, 5:07:29 AM