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Why this script

Books have ISBN (International Standard Book Number) numbers which follow certain (mathematical) rules. Using these rules you can validate a number.

What this script can do

It can do the validation for you! :-) It supports ISBN-10 and ISBN-13

How to use

Simply include the function - or the class if you're using Zend Framework - and pass the ISBN number to have it checked.
See the example page for more details