SYNOPSIS
use Algorithm::CheckDigits;
$ups = CheckDigits('ups');
if ($ups->is_valid('1Z 591580 68 55587736')) {
# do something
}
$cn = $ups->complete('1Z 591580 68 5558773');
# $cn = '1Z 591580 68 55587736'
$cd = $ups->checkdigit('1Z 591580 68 55587736');
# $cd = '6'
$bn = $ups->basenumber('1Z 591580 68 55587736');
# $bn = '1Z 591580 68 5558773'
DESCRIPTION
ALGORITHM
- 1.
- Beginning left all numbers are weighted alternatively 1 and 2.
- 2.
- The sum of all products is computed.
- 3.
- The sum of step 3 ist taken modulo 10.
- 4.
- The check digit is the difference between 10 and the number from step 3.
METHODS
- is_valid($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.