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Algorithm::CheckDigits::M11_013.3pm
Langue: en
Version: 2009-11-20 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
NAME
CheckDigits::M11_013 - compute check digits for VAT Registration Number (GR)SYNOPSIS
use Algorithm::CheckDigits; $ustid = CheckDigits('ustid_gr'); if ($ustid->is_valid('123456783')) { # do something } $cn = $ustid->complete('12345678'); # $cn = '123456783' $cd = $ustid->checkdigit('123456783'); # $cd = '3' $bn = $ustid->basenumber('123456783'); # $bn = '12345678';
DESCRIPTION
ALGORITHM
- 1.
- Beginning right with the digit before the checkdigit all digits are weighted with 2 ** position. I. e. the last digit is multiplied with 2, the next with 4, then 8 and so on.
- 2.
- The weighted digits are added.
- 3.
- The sum from step 2 is taken modulo 11.
- 4.
- If the sum from step 3 is greater than 9, the check sum is 0 else it is the sum itself.
METHODS
- is_valid($number)
- Returns true only if $number consists solely of numbers and the rightmost digit is a valid check digit according to the algorithm given above.
Returns false otherwise,
- complete($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.AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de,Contenus ©2006-2024 Benjamin Poulain
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