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Answers and rating deltas for

why this following php code gives such result

Author Votes Δ
Marty 3 +1.42
kwelsan 1 +1.32
Jian 0 -0.88
Mohan 0 -0.89
Awlad Liton 0 -0.35
sevenseacat 0 -0.66
Ramesh 0 -0.55
xdazz 0 -0.96
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