CheckDigits::M11_004(3) compute check digits for CPF (BR), Titulo Eleitoral (BR)

SYNOPSIS


use Algorithm::CheckDigits;
$cpf = CheckDigits('cpf');
if ($cpf->is_valid('043.033.407-90')) {
# do something
}
$cn = $cpf->complete('043.033.407-');
# $cn = '043.033.407-90'
$cd = $cpf->checkdigit('043.033.407-90');
# $cd = '90'
$bn = $cpf->basenumber('043.033.407-90');
# $bn = '043.033.407-'

DESCRIPTION

ALGORITHM

1.
From left to right all digits are multiplied with their position in the sequence.
2.
The sum of all products is computed.
3.
The sum of step 2 is taken modulo 11.

a) If the result is 0 or 1 the checkdigit is 0

b) otherwise the checkdigit is 11 minus the result.

4.
The first checkdigit is appended to the number and step 1 to 3 are repeated.

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]>