SYNOPSIS
use Algorithm::CheckDigits;
$ustid = CheckDigits('ustid_lu');
if ($ustid->is_valid('13669580')) {
# do something
}
$cn = $ustid->complete('136695');
# $cn = '13669580'
$cd = $ustid->checkdigit('13669580');
# $cd = '80'
$bn = $ustid->basenumber('13669580');
# $bn = '136695'
DESCRIPTION
ALGORITHM
- 1.
- The checksum is the whole number taken modulo 89.
METHODS
- is_valid($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.