SYNOPSIS
use Algorithm::CheckDigits;
$c39 = CheckDigits('code_39');
if ($c39->is_valid('AB-123K')) {
# do something
}
$cn = $c39->complete('AB-123');
# $cn = 'AB-123K'
$cd = $c39->checkdigit('AB-123K');
# $cd = 'K'
$bn = $c39->basenumber('AB-123K');
# $bn = 'AB-123'
DESCRIPTION
ALGORITHM
- 1.
- After replacing all non numeric letters with their respective values, the sum of all numbers is computers
- 2.
- The checkdigit is the sum from step 1 taken modulo 43.
METHODS
- is_valid($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.