SYNOPSIS
use Algorithm::CheckDigits;
$sedol = CheckDigits('sedol');
if ($sedol->is_valid('0123457')) {
# do something
}
$cn = $sedol->complete('012345');
# $cn = '0123457'
$cd = $sedol->checkdigit('0123457');
# $cd = '7'
$bn = $sedol->basenumber('0123457');
# $bn = '012345'
DESCRIPTION
ALGORITHM
- 1.
- Beginning left all numbers are weighted with 1,3,1,7,3,9 and 1 (checkdigit)
- 2.
- The sum of all products is computed.
- 3.
- The check digit is the difference of the sum from step 3 to the next multiple of 10.
METHODS
- is_valid($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.