CheckDigits::M10_008 − compute check digits for Sedol (GB)
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'); # $bn = '012345'
ALGORITHM
1. |
Beginning left all numbers are weighted with 1,3,1,7,3,9 and 1 (checkdigit) |
||
2. |
The sum of all products is computed. |
||
3. |
The check digit is the difference of the sum from step 3 to the next multiple of 10. |
METHODS
is_valid($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.
Mathias Weidner, <mathias AT weidner DOT in−bad−schmiedeberg.de>
perl, CheckDigits, www.pruefziffernberechnung.de.