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Algorithm::CheckDigits::MXX_006.3pm
Langue: en
Version: 2010-07-01 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
NAME
CheckDigits::MXX_006 - compute check digits with Verhoeff schemeSYNOPSIS
use Algorithm::CheckDigits; $verhoeff = CheckDigits('verhoeff'); if ($verhoeff->is_valid('14567894')) { # do something } $cn = $verhoeff->complete('1456789'); # $cn = '14567894' $cd = $verhoeff->checkdigit('14567894'); # $cd = '4' $bn = $verhoeff->basenumber('14567894'); # $bn = '1456789'
DESCRIPTION
ALGORITHM
- 1.
- Right to left all digits are permutated according to a permutation table.
- 2.
- The permutated digits are combined using a diA~Xder table. The first with the second, the result with the third, this result with the fourth and so on.
- 3.
- The result of the last combination in the diA~Xder table is in such a way combined that the result is 0 (zero). The number used for this combination is the checksum.
For details look at the source.
METHODS
- is_valid($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 $number does not consist solely of digits.
- basenumber($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>THANKS
Jonathan Peters wrote Algorithm::Verhoeff from which I took the routine to compute the checkdigits.SEE ALSO
perl, CheckDigits, <http://www.cs.utsa.edu/~wagner/laws/verhoeff.html>, <http://www.cs.nmsu.edu/~cssem/Dickcheckdoc.pdf>Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre