Algorithm::CheckDigits::M11_015(3pm)

Usage

  use Algorithm::CheckDigits;
  $ustid = CheckDigits('esr5_ch');
  if ($ustid->is_valid('050001000012000 241170032660178 10304')) {
        # do something
  }
  $cn = $ustid->complete('0001000012000 241170032660178 10304');
  # $cn = '050001000012000 241170032660178 10304'
  $cd = $ustid->checkdigit('0001000012000 241170032660178 10304');
  # $cd = '05'
  $bn = $ustid->basenumber('050001000012000 241170032660178 10304');
  # $bn = '0001000012000 241170032660178 10304';

Overview

Algorithm

1.: Beginning right all digits are weighted with the repeating sequence 2, 3, 4, 5, 6, 7.

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. If the difference is 11, the checkdigit is 00.

Methods

is_valid($number)

Returns true only if $number consists solely of numbers (with or without space between them) and the first two digits are valid check digits according to the algorithm given above.

Returns false otherwise,

complete($number)

The check digit for $number is computed and inserted before the $number.

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

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.

Releases

9 releases since Debian 5.0 (Lenny); the text changed 3 times.