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>
SEE ALSO¶
perl, CheckDigits,
www.pruefziffernberechnung.de.