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Answers and rating deltas for

How can I Accept only letter, number, comma (,) and dot (.) using php

Author Votes Δ
anubhava 1 +0.17
Anik Islam Abhi 1 +2.96
Supamiu 0 -2.07
Sorbo 0 -2.27
Last visited: Apr 27, 2015, 9:18:29 PM