CheckDigits::M11_008 - compute check digits for VAT Registration Number (DK)
use Algorithm::CheckDigits; $ustid = CheckDigits('ustid_dk'); if ($ustid->is_valid('13585628')) { # do something } $cn = $ustid->complete('1358562'); # $cn = '13585628' $cd = $ustid->checkdigit('13585628'); # $cd = '8' $bn = $ustid->basenumber('13585628'); # $bn = '1358562';
Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2, 1
The weighted digits are added.
The sum from step 2 is taken modulo 11.
The number is valid if the sum from step 3 is zero (0).
Returns true only if $number consists solely of numbers and hyphens and the two digits in the middle are valid check digits according to the algorithm given above.
$number
Returns false otherwise,
The check digit for $number is computed and inserted into the middle of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits, hyphens and spaces.
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
Returns '' if $number is valid.
Return undef otherwise.
None by default.
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
perl, CheckDigits, www.pruefziffernberechnung.de,
To install Algorithm::CheckDigits, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::CheckDigits
CPAN shell
perl -MCPAN -e shell install Algorithm::CheckDigits
For more information on module installation, please visit the detailed CPAN module installation guide.