CheckDigits::MXX_006(3User Contributed Perl DocumentatiCheckDigits::MXX_006(3)NAME
CheckDigits::MXX_006 - compute check digits with Verhoeff scheme
SYNOPSIS
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>
perl v5.14.1 2011-06-20 CheckDigits::MXX_006(3)