Algorithm::CheckDigits::M11_007(3pm)

Usage

  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';

Overview

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.

Releases

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