CheckDigits::M97_001(3) compute check digits for VAT Registration Number (BE)

SYNOPSIS


use Algorithm::CheckDigits;
$ustid = CheckDigits('ustid_be');
if ($ustid->is_valid('136695962')) {
# do something
}
$cn = $ustid->complete('1366959');
# $cn = '136695962'
$cd = $ustid->checkdigit('136695962');
# $cd = '62'
$bn = $ustid->basenumber('136695962');
# $bn = '1366959'

DESCRIPTION

ALGORITHM

1.
The whole number (without checksum) is taken modulo 97.
2.
The checksum is difference of the remainder from step 1 to 97.

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 checkdigits of $number if $number has a valid check digit.

Return '' otherwise.

EXPORT

None by default.

AUTHOR

Mathias Weidner, <[email protected]>