CheckDigits::M10_008(3) compute check digits for Sedol (GB)

SYNOPSIS


use Algorithm::CheckDigits;
$sedol = CheckDigits('sedol');
if ($sedol->is_valid('0123457')) {
# do something
}
$cn = $sedol->complete('012345');
# $cn = '0123457'
$cd = $sedol->checkdigit('0123457');
# $cd = '7'
$bn = $sedol->basenumber('0123457');
# $bn = '012345'

DESCRIPTION

ALGORITHM

1.
Beginning left all numbers are weighted with 1,3,1,7,3,9 and 1 (checkdigit)
2.
The sum of all products is computed.
3.
The check digit is the difference of the sum from step 3 to the next multiple of 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.

EXPORT

None by default.

AUTHOR

Mathias Weidner, <[email protected]>