Simple Survey Leads To Big Profits Online! By Jim Edwards

Success online follows a simple formula...

"Ask and you shall _______."

Most people fill in the blank with "receive". Not only is it a well-known phrase from the Bible, but it's also a very powerful online marketing principle.

If you operate a business and want to sell massively more products and services quickly, the fastest way to do it is by simply asking your customers and prospects what they want... and then give it to them.

In the past, gathering critical research information through customer surveys represented a very time-consuming, expensive and labor-intensive process available only to large organizations.

However.... Read more on this topic>>

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Luhn Algorithm: 

The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, was developed in the 1960s as a method of validating identification numbers.

It is a simple checksum formula used to validate a variety of account numbers, such as credit card numbers and Canadian Social Insurance Numbers. It was created in the 1960s by IBM scientist Hans Peter Luhn (1896–1964).

The algorithm is in the public domain and is in wide use today. Most credit cards and many government identification numbers use the algorithm as a simple method of distinguishing valid numbers from collections of random digits.

The algorithm: Use the code below if you like to implement the functionality of checking for a valid credit card number. 

(PHP)

<?

/* Credit card LUHN checker */

function validatecard($cardnumber) {
$cardnumber=preg_replace("/\D|\s/", "", $cardnumber); # strip any non-digits
$cardlength=strlen($cardnumber);
$parity=$cardlength % 2;
$sum=0;
for ($i=0; $i<$cardlength; $i++) {
$digit=$cardnumber[$i];
if ($i%2==$parity) $digit=$digit*2;
if ($digit>9) $digit=$digit-9;
$sum=$sum+$digit;
}
$valid=($sum%10==0);
return $valid;
}
?>
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Perl Implementation For Credit Cards (Working Version - Tested) - Download Code (*This is a zipped file.)

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