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Algorithm::CheckDigits::M11_003(3) User Contributed Perl Documentation Algorithm::CheckDigits::M11_003(3)

CheckDigits::M11_003 - compute check digits for PKZ (GDR)

  use Algorithm::CheckDigits;

  $pkz = CheckDigits('pkz');

  if ($pkz->is_valid('150765400354')) {
        # do something
  }

  $cn = $pkz->complete('15076540035');
  # $cn = '150765400354'

  $cd = $pkz->checkdigit('150765400354');
  # $cd = '4'

  $bn = $pkz->basenumber('150765400354');
  # $bn = '150765400354'

1.
The checkdigit is set to 0.
2.
From right to left the digits are weighted (multiplied) with 2,4,8,5,10,9,7,3,6,1,2,4.
3.
The products are added.
4.
The sum of step 3 is taken modulo 11.
5.
The value of step 4 is added to a multiple (0..9) of the weight of the checkdigit (2).
6.
The sum of step 5 is taken modulo 11.
7.
The checkdigit is the multiple of the weight of the checkdigit where the value of step 6 equals 10.
8.
If there can't be reached a value of 10 in step 6, the number cannot be taken as a PKZ.

To validate a PKZ apply steps 2 to 4 to the complete number.

is_valid($number)
Returns true only if $number consists solely of numbers and the last 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 concatenated to the end of $number.

Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

basenumber($number)
Returns the basenumber of $number if $number has a valid check digit.

Return '' otherwise.

checkdigit($number)
Returns the checkdigit of $number if $number has a valid check digit.

Return '' otherwise.

None by default.

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

perl, CheckDigits, www.pruefziffernberechnung.de.
2022-04-09 perl v5.32.1

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