NAME

CheckDigits::M11_007 - compute check digits for VAT Registration Number (FI)

SYNOPSIS

  use Algorithm::CheckDigits;

  $ustid = CheckDigits('ustid_fi');

  if ($ustid->is_valid('13669598')) {
        # do something
  }

  $cn = $ustid->complete('1366959');
  # $cn = '13669598'

  $cd = $ustid->checkdigit('13669598');
  # $cd = '8'

  $bn = $ustid->basenumber('13669598');
  # $bn = '1366959';

DESCRIPTION

ALGORITHM

1.: Beginning left every digit is weighted with 7,9,10,5,8,4,2.
2.: The weighted digits are added.
3.: The sum from step 2 is taken modulo 11.
4.: The checkdigit is 11 minus the sum from step 3. Is the difference 10, the number won't be taken. If the difference is 11, the checkdigit is 0.

METHODS

is_valid($number): Returns true only if $number consists solely of digits and the rightmost digit is a valid check digit according to the algorithm given above.
Returns false otherwise,
complete($number): The check digit for $number is computed and appended to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits.
basenumber($number): Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
checkdigit($number): Returns the check digits of $number if $number has valid check digits.
Return '' otherwise.

EXPORT

None by default.

AUTHOR

Mathias Weidner, "<mamawe@cpan.org>"