CheckDigits::M11_003(3User Contributed Perl DocumentatiCheckDigits::M11_003(3)NAMECheckDigits::M11_003 - compute check digits for PKZ (GDR)
SYNOPSIS
use Algorithm::CheckDigits;
$pkz = CheckDigits('pkz');
if ($pkz->is_valid('150765400354')) {
# do something
}
$cn = $pkz->complete('15076540035');
# $cn = '150765400354'
$cd = $pkz->checkdigit('150765400354');
# $cd = '4'
$bn = $pkz->basenumber('150765400354');
# $bn = '150765400354'
DESCRIPTION
ALGORITHM
1. The checkdigit is set to 0.
2. From right to left the digits are weighted (multiplied) with
2,4,8,5,10,9,7,3,6,1,2,4.
3. The products are added.
4. The sum of step 3 is taken modulo 11.
5. The value of step 4 is added to a multiple (0..9) of the weight of
the checkdigit (2).
6. The sum of step 5 is taken modulo 11.
7. The checkdigit is the multiple of the weight of the checkdigit
where the value of step 6 equals 10.
8. If there can't be reached a value of 10 in step 6, the number
cannot be taken as a PKZ.
To validate a PKZ apply steps 2 to 4 to the complete number.
METHODS
is_valid($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.
perl v5.14.1 2009-11-20 CheckDigits::M11_003(3)