[FX.php List] [OFF] Luhn validation for Credit Card?

[Joel Shapiro]

Thanks Jonathan and Michael

I'm not Michael, but...
It's possible for anyone to disable JavaScript on her/his browser,  
and people on this list have stated that some large corporations or  
institutions disable JavaScript on all their users' workstations.   
Whenever I use JavaScript for any kind of form validation I still do  
the same checks a second time in PHP.  JavaScript can be nice  
because, being client-side, it's immediate for the user.  PHP, being  
server-side, happens after form-submission but is important because  
it can never be circumvented by the user.

-Joel


On Aug 7, 2009, at 7:10 AM, Jonathan Schwartz wrote:

> Question for Michael...
>
> It is said that you can not rely on javascript working 100% of the  
> time.  Do you agree?  If so, do you have a backup for dealing with  
> that event...such as running a php script instead, for instance?
>
> Thx
>
> Jonathan
>
> At 3:49 PM +1000 8/7/09, Head Honcho wrote:
>> Hi Joel,
>>
>> On 07/08/2009, at 11:19 AM, Joel Shapiro wrote:
>>
>>> Hi all
>>>
>>> I've inherited a project that validates a basic credit card  
>>> number within FMP using the Luhn algorithm
>>>
>>> ("The Luhn algorithm or Luhn formula, also known as the "modulus  
>>> 10" or "mod 10" algorithm, is a simple checksum formula used to  
>>> validate a variety of identification numbers, such as credit card  
>>> numbers..."
>>> http://en.wikipedia.org/wiki/Luhn_algorithm )
>>>
>>> I'd rather check this in the PHP before submission to FMP.
>>
>> I check this with javascript before it gets sent to the server. I  
>> also have a php check script if jonathan's doesn't suffice.
>>
>> HTH.
>>
>> Regards
>>
>> Michael Ward
>> --
>> Head Honcho
>> CustoMike Solutions
>> Member, FileMaker Business Alliance
>> Member, FileMaker Technical Network
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>> headhoncho at customikesolutions.com
>>
>>
>>
>>
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>
> -- 
> Jonathan Schwartz
> Exit 445 Group
> jonathan at exit445.com
> http://www.exit445.com
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