The PHP ISBN library

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Can be used for both ISBN validation, translating, formatting and ISBN data lookups.

Lookups currently use Amazon to fetch ISBN data and populate a Book object.

This library is very much "in development" and will contain bugs, incomplete code and unfinished functionality.

Some code samples for ISBN code validating, translating, and formatting taken from: https://github.com/Fale/isbn

References: Comparison between different ISBN lookup services: http://journal.code4lib.org/articles/8715 OCLC ISBN Resource: http://www.oclc.org/developer/develop/web-services/xid-api/xisbn-resource.en.html