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Answers and rating deltas for

Could someone explain me this while loop for PHP?

Author Votes Δ
Ignacio Vazquez-Abrams 4 +1.61
thomasrutter 2 +0.29
relet 1 -2.04
Matthew Flaschen 1 -1.65
Last visited: Sep 14, 2014, 5:07:29 AM