SYNOPSIS
use Algorithm::CheckDigits;
$dni = CheckDigits('ustid_ie');
if ($dni->is_valid('8473625E')) {
# do something
}
$cn = $dni->complete('8473625');
# $cn = '8473625E'
$cd = $dni->checkdigit('8473625E');
# $cd = 'E'
$bn = $dni->basenumber('8473625E');
# $bn = '8473625'
DESCRIPTION
ALGORITHM
- 1.
- Beginning right all digits are weighted with their position in the number (i.e. the number left from the check digit is multiplied with 2, the next with 3 and so on).
- 2.
- All products are added.
- 3.
- The check digit is the sum from step 2 modulo 23. This number is expressed as the corresponding letter from the alphabet where A-V correspond to 1-22 and W stands for check digit 0.
METHODS
- is_valid($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.