CheckDigits::M10_005 − compute check digits for Deutsche Post Identcode/Leitcode (DE)
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'); # $bn = '21.802 580.906'
ALGORITHM
1. |
Beginning left all numbers are weighted alternatively 4 and 9. |
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2. |
The sum of all products is computed. |
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3. |
The sum of step 3 ist taken modulo 10. |
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4. |
The check digit is the difference between 10 and the number from step 3. |
METHODS
is_valid($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.
Mathias Weidner, <mathias AT weidner DOT in−bad−schmiedeberg.de>
perl, CheckDigits, www.pruefziffernberechnung.de.