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Answers and rating deltas for

Can anyone explain this impossible bit of PHP logic?

Author Votes Δ
SaltLake 3 +2.80
Ignacio Vazquez-Abrams 3 +0.64
Marc B 2 -0.20
Mnebuerquo 1 -4.05
Last visited: Sep 14, 2014, 5:07:29 AM