Brian P. Giroux wrote:
> I am just learning PHP and as a practical exercise I've been working on
> a set of functions to process and manipulate what I call "normalized
> number" (ISBNs, EANs, UPCs, etc...)
>
> My ultimate goal is to create a normnum class and child classes for the
> different types of numbers.
>
> Because of my line of work, I am mostly interested in ISBN-10s,
> ISBN-13s, EANs and UPCs, but it can also be expanded to credit card
> numbers, Canadian Social Insurance Numbers, and many more.
>
> So far I have functions to validate ISBN-10s and EANs although I've run
> into a bit of a wall with the digit_sum function as explained in the B:
> section of that functions header comments.
if you want to turn the direction around reverse the string before
you start the loop:
http://php.net/manual/en/function.strrev.php
personally I would turn the string into an array of chars (which you can then
also
reverse as need be) and then do a foreach loop on it ('array index'+1 can be
used
to determine position) ... personal preference. anyway take a look at these
functions:
http://php.net/manual/en/function.str-split.php
http://php.net/array_reverse
http://php.net/foreach
>
> If anyone can help me out with that or provide any other advice about
> the rest of it, I'd be grateful.
keep commenting all your code to that extent! you do us proud :-)
>
> The file can be found at http://www.senecal.ca/normnums.php.txt
>
> Thanks.
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