[Web4lib] Conversion between ISBN-10 and ISBN-13

[Tim Spalding]

The inestimable John Blyberg ported some ISBN10/13 tools to PHP. See
http://www.blyberg.net/2006/04/05/php-port-of-isbn-1013-tool/ .

I've noticed his valid-10 script has errors—there's a comment about it there.

Tim

On 9/30/06, Rick Mason <rcmason at rsproductions.net> wrote:
> Hi David,
>
> According to the Wikipedia entry (i.e. don't start coding until you have
> confirmed the information elsewhere), the first three digits are a, EAN
> County Code for an imaginary country called "Bookland".  There are two
> codes for Bookland:  978 for existing ISBN codes (you can safely assume
> that the last 10 digits are an existing ISBN-10 and can be handled as
> such), and 979 for pure ISBN-13 codes.
>
> It probably isn't a good idea to convert 979 codes to 10-digit ISBN
> systems because a) they use different check-digit calculations, and b)
> the final ten digits of an ISBN-13 can't be converted back into a valid
> ISBN-13 unless you somehow note that it needs the 979 appended.
>
> Sites:
> http://en.wikipedia.org/wiki/Isbn
> http://en.wikipedia.org/wiki/Bookland_%28imaginary_place%29
> http://www.gs1.org/
>
> Hope this helps!  Good luck, if you decide to code it yourself!
>
> Rick Mason
>
> Patricia F Anderson wrote:
> > There is already an online converter:
> >
> > <http://www.isbn.org/converterpub.asp>
> >
> > They offer the service to convert large stacks.
> >
> > "Need a large list of ISBNs converted? Enquire about obtaining your
> > converted list."
> >
> > To go from 13 to 10 is easy -- the isbn-10 is the last 10 digits of
> > thte isbn-13. Going the other direction, I haven't figured out yet
> > (not that I've tried hard).
> >
> >  -- Patricia Anderson, pfa at umich.edu
> >
> > On Sat, 30 Sep 2006, David Kane wrote:
> >
> >> Hi,
> >>
> >> Can anyone tell me what the conversion between ISBN-10 and ISBN-13 is,
> >> please.  I need to write a little conversion program.  Anything in PHP,
> >> for example.
> >>
> >> Thanks a lot.
> >>
> >> David Kane
> >> Waterford Institute of Technology
> >> http://library.wit.ie/
> >> T: ++353.51302838
> >> M: ++353.876693212
>
>
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