SYNOPSIS
use Algorithm::CheckDigits;
$ustid = CheckDigits('ustid_be');
if ($ustid->is_valid('136695962')) {
# do something
}
$cn = $ustid->complete('1366959');
# $cn = '136695962'
$cd = $ustid->checkdigit('136695962');
# $cd = '62'
$bn = $ustid->basenumber('136695962');
# $bn = '1366959'
DESCRIPTION
ALGORITHM
- 1.
- The whole number (without checksum) is taken modulo 97.
- 2.
- The checksum is difference of the remainder from step 1 to 97.
METHODS
- is_valid($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 checkdigits of $number if $number has a valid check
digit.
Return '' otherwise.