SYNOPSIS
use Algorithm::CheckDigits;
$pa = CheckDigits('pa_de');
if ($pa->is_valid('2406055684D<<6810203<0705109<6')) {
# do something
}
$cn = $pa->complete('240605568_D<<681020_<070510_<_');
# $cn = '2406055684D<<6810203<0705109<6'
$cd = $pa->checkdigit('2406055684D<<6810203<0705109<6');
# $cd = '6'
$bn = $pa->basenumber('2406055684D<<6810203<0705109<6');
# $bn = '240605568_D<<681020_<070510_<_'
DESCRIPTION
ALGORITHM
- 1.
- Beginning left all digits are weighted with 7,3,1,7,3,1,...
- 2.
- The sum of those products is computed.
- 3.
- The checksum is the last digit of the sum from step 2 (modulo 10).
- 4.
- Step 1 to 3 is performed for every part of the number and for all 3 parts including the particular checkdigit to compute the total checksum.
METHODS
- is_valid($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.