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CheckDigits::MBase_002

NAME

CheckDigits::MBase_002 − compute check digits for blood bags (DE), BZUe (DE), VAT Registration Number (DE)

SYNOPSIS

  use Algorithm::CheckDigits;
  $bb = CheckDigits('blutbeutel');
  if ($bb−>is_valid('2761011234567893')) {
        # do something
  }
  $cn = $bb−>complete('276101123456789');
  # $cn = '2761011234567893'
  $cd = $bb−>checkdigit('2761011234567893');
  # $cd = '3'
  $bn = $bb−>basenumber('2761011234567893');
  # $bn = '276101123456789';

DESCRIPTION

ALGORITHM

1.

Start with values P = 10, S = 0.

2.

Beginning left you do the following for all digits

1.

S = (P + digit) modulo 10

2.

If S is 0 then S = 10.

3.

P = (2 * S) modulo 11

3.

The check digit is (11 − P) modulo 10.

METHODS
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.

EXPORT
None by default.

AUTHOR

Mathias Weidner, <mathias AT weidner DOT in−bad−schmiedeberg.de>

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de, www.eurocode.org.

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