CheckDigits::M11_001 - compute check digits for ISBN, ISSN, VAT RN (PT), HKID (HK), Wagon number (BR), NHS (GB), VAT (SL)
use Algorithm::CheckDigits; $isbn = CheckDigits('isbn'); if ($isbn->is_valid('3-88229-192-3')) { # do something } $cn = $isbn->complete('3-88229-192-'); # $cn = '3-88229-192-3' $cd = $isbn->checkdigit('3-88229-192-3'); # $cd = '3' $bn = $isbn->basenumber('3-88229-192-3'); # $bn = '3-88229-192-'
With a Hongkong ID (hkid) the leftmost char is replaced with its position in the alphabet and then multiplied with 8 (its weight).
If the difference is 10, the check digit is 'X'.
If the difference is 11, the check digit is 0.
If the difference is greater then 9, the check digit is '0'.
If the difference is 10, the check digit is 'A'.
If the difference is 11, the check digit is 0.
If the difference is 10, the check digit is 0.
If the difference is 11, the check digit is 1.
If the difference is 10, the number would not be taken.
If the difference is 11, the check digit is 0.
This is a little bit unclear, don't trust on the method for this type.
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,
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.
Returns the basenumber of $number
if $number
has a valid check digit.
Return '' otherwise.
Returns the checkdigit of $number
if $number
has a valid check digit.
Return '' otherwise.
None by default.
Mathias Weidner, <mamawe@cpan.org>
perl, CheckDigits, www.pruefziffernberechnung.de.