Comments on: PHP port of ISBN-10/13 tool

By: Vladimir2

Vladimir2 — Thu, 04 Feb 2010 03:08:36 +0000

аквариум

By: Vladimir

Vladimir — Tue, 02 Feb 2010 01:23:33 +0000

голд

By: Vladimir

Vladimir — Mon, 01 Feb 2010 23:47:00 +0000

постеры к сериалам

By: Keith Nunn

Keith Nunn — Thu, 21 Feb 2008 15:01:40 +0000

I have quite a complete ISBN test tool that does all of the above and also does GTIN-14. It’s for php5, but could likely be backported to php4 fairly easily.

If anyone is interested you’ll find it at http://www.phpclasses.org/browse/package/1707.html

It’s just called ISBNcheck (not a clever name, but it works)

kapn

By: Adam

Adam — Fri, 04 May 2007 22:26:48 +0000

Here is a txt version

http://tinyurl.com/28ncrk

By: Nicholas

Nicholas — Mon, 16 Apr 2007 21:26:56 +0000

Am I crazy or is none of the code on this page complete?

Lines like this: for($i = 1; $i genchksum10($isbn2);

and blocks of code that end like this:

function isbn_genchksum13($isbn) {
$isbn = trim($isbn);
for ($i = 0; $i

Surely can’t be correct. What is going on here? Is everyone just not good at copy and pasteing? Am I the idiot? I’m baffled.

By: Adam

Adam — Tue, 27 Mar 2007 21:44:43 +0000

Thijs, thanks for the pointer. I’m in the US, dealing with American books. It never occurred to me that there would be a standard for hyphenating or that international books would be hyphenated differently.

I poked around the site and didn’t see a guide for the 13 digit numbers. I assume its the same as 10, except with the dash added after the opening 978.

I will update my function when I have some free time, and I’ll post the code here.

By: Thijs

Thijs — Sun, 18 Mar 2007 17:03:59 +0000

Hi Adam, your function isbn_dashes(); does not place the hyphens on the right place most of the times. It may be correct with some US-ISBN numbers, I doubt you've read the official guidelines: Hyphenation Instructions

By: Adam

Adam — Thu, 22 Feb 2007 19:34:34 +0000

This is the collection of ISBN code I’m actively using, compiled from the original code and the comments.

I added the isnb_dashes($isbn) function, which accepts a 10 or 13 digit ISBN number and adds the dashes. This does not check the validity of the string, it just returns it. If it isn’t 10 or 13 characters long, the function returns false.

function isbn_convert($isbn) { $isbn2 = substr("978" . trim($isbn), 0, -1); $sum13 = isbn_genchksum13($isbn2); $isbn13 = "$isbn2-$sum13"; return ($isbn13); }


function isbn_gettype($isbn) {

        $isbn = trim($isbn);

        if (preg_match('%[0-9]{12}?[0-9Xx]%s', $isbn)) {

            if (isbn_validatettn($isbn)==1){

                    return 13;

                       } else {return(-1);}
                } else if (preg_match('%[0-9]{9}?[0-9Xx]%s', $isbn)) {

              if (isbn_validateten($isbn)==1){

                    return 10;

                       } else {return -1;}

        } else {

            return -1;

        }

    }
function isbn_validateten($isbn) {

        $isbn = trim($isbn);

        $chksum = substr($isbn, -1, 1);

        $isbn = substr($isbn, 0, -1);

        if (preg_match('/X/i', $chksum)) { $chksum="10"; }

        $sum = isbn_genchksum10($isbn);

        if ($chksum == $sum){

            return 1;

        }else{

            return 0;

        }

    }
function isbn_validatettn($isbn) {

        $isbn = trim($isbn);

        $chksum = substr($isbn, -1, 1);

        $isbn = substr($isbn, 0, -1);

        if (preg_match('/X/i', $chksum)) { $chksum="10"; }

        $sum = isbn_genchksum13($isbn);

        if ($chksum == $sum){

            return 1;

        }else{

            return 0;

        }

    }
function isbn_genchksum13($isbn) {

        $t = 2;

        $isbn = trim($isbn);

                $b=0;

                for($i = 1; $i genchksum10($isbn2);

        if ($sum10==10) {$sum10='X';}

        $isbn10 = $isbn2.$sum10;

        return ($isbn10);

    }

## ISBN Add Dashes function isbn_dashes($isbn) { switch(strlen($isbn)): case 13: return substr($isbn,0,3)."-" .substr($isbn,3,1)."-" .substr($isbn,4,3)."-" .substr($isbn,7,5)."-" .substr($isbn,12,1); break; case 10: return substr($isbn,0,1)."-" .substr($isbn,1,3)."-" .substr($isbn,4,5)."-" .substr($isbn,9,1); break; default: return false; break; endswitch; }

By: huh

huh — Tue, 13 Feb 2007 06:04:14 +0000

cannot get this working.
just including it throws:

Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or ‘}’ in /usr/home/www/htdocs/test/ISBN_script.php on line 11

so I changed public function to function and (not surprisingly)

Fatal error: Undefined class name ’self’ in /usr/home/www/htdocs/test/ISBN_script.php on line 13

By: OracleHome

OracleHome — Wed, 31 Jan 2007 17:54:46 +0000

Hi,

Thanks for producing this, I found a javascript version, but wanted a PHP version for my site.

This code has saved me a lot of time.

Thanks again!

By: andras

andras — Sun, 14 Jan 2007 23:26:51 +0000

One more time, sorry. I think the test should be :
if (preg_match(’%^[0-9]{13}$%s’, $isbn))