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Algorithm::CheckDigits::M23_002.3pm
Langue: en
Version: 2008-05-17 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
CheckDigits::M23_002 - compute check digits for VAT Registration Number (IE)SYNOPSIS
use Algorithm::CheckDigits; $dni = CheckDigits('ustid_ie'); if ($dni->is_valid('8473625E')) { # do something } $cn = $dni->complete('8473625'); # $cn = '8473625E' $cd = $dni->checkdigit('8473625E'); # $cd = 'E' $bn = $dni->basenumber('8473625E'); # $bn = '8473625'
DESCRIPTION
ALGORITHM
- 1.
- Beginning right all digits are weighted with their position in the number (i.e. the number left from the check digit is multiplied with 2, the next with 3 and so on).
- 2.
- All products are added.
- 3.
- The check digit is the sum from step 2 modulo 23. This number is expressed as the corresponding letter from the alphabet where A-V correspond to 1-22 and W stands for check digit 0.
METHODS
- is_valid($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@weidner.in-bad-schmiedeberg.de>SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre