CheckDigits::M10_005(3) compute check digits for Deutsche Post

SYNOPSIS


use Algorithm::CheckDigits;
$ic = CheckDigits('identcode_dp');
if ($ic->is_valid('21.802 580.906 6')) {
# do something
}
$cn = $ic->complete('21.802 580.906');
# $cn = '21.802 580.9066'
$cd = $ic->checkdigit('21.802 580.906 6');
# $cd = '6'
$bn = $ic->basenumber('21.802 580.906 6');
# $bn = '21.802 580.906'

DESCRIPTION

ALGORITHM

1.
Beginning left all numbers are weighted alternatively 4 and 9.
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.

EXPORT

None by default.

AUTHOR

Mathias Weidner, <[email protected]>