NAME

CheckDigits::M11_004 - 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, <mathias@weidner.in-bad-schmiedeberg.de>