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And then you say it's overly verbose without stating which part you think is verbose.
What's the point of commenting if you can't complete a thought?
They can be rendered using php Documentor or Javadoc.Instead of doing the match each time though it just pulls the results from a pre computed array.Once this process has happened, the digits are summed together and a mod 10 check is performed.Then I will show another implementation that allows you to generate multiple valid test card numbers.The algorithm I want to discuss here is called the Luhn Algorithm. The Luhn algorithm is a simple checksum formula used to validate a variety of identification numbers, but the most common use is credit card numbers.