Mod10

Syntax

Mod10(str)

str	A string specifying a number.

Description

Performs a Pad 10-based check digit calculation with the alternating weights 2 and 1, starting at the end of the string. The digits of the values are summed. This check digit calculation method is known as Luhn's algorithm.

Returns

A string specifying a single digit number (0-9).

Example

{

    $billnr="1234567890";
    $checkdigit=mod10($billnr);
    $newbillnr=$billnr+$checkdigit;
}

Result:

$checkdigit is "3"

$newbillnr is "12345678903"