Mod11

Syntax

Mod1l(str)

str	A string specifying a number.

Description

Performs a Pad 11-based check digit calculation with the cycled weights 7, 9, 5, 3, 2, 4, 6, 8, starting at the end of the string. Weighted values are summed. A resulting 0 is replaced by a 5, and a resulting 10 is replaced by a 0.

Returns

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

Example

$total = "11234567";

$chk = mod11($total);