SYNOPSIS
use Algorithm::CheckDigits;
$rv = CheckDigits('rentenversicherung');
if ($rv->is_valid('65180539W001')) {
# do something
}
$cn = $rv->complete('65180539W00');
# $cn = '65180539W001'
$cd = $rv->checkdigit('65180539W001');
# $cd = '1'
$bn = $rv->basenumber('65180539W001');
# $bn = '65180539W00'
DESCRIPTION
ALGORITHM
- 1.
- The letter is replaced with a two-figure number appropriate to the position of the letter in the german alphabet.
- 2.
- Beginning left all numbers are weighted with 2,1,2,5,7,1,2,1,2,1,2,1.
- 3.
- The the total of the digits of all products is computed.
- 4.
- The check digit is sum from step 3 taken modulo 10.
METHODS
- is_valid($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.