Subversion-Projekte lars-tiefland.laravel_shop

<?php

namespace Faker\Provider\pt_BR;

/**

 * Calculates one MOD 11 check digit based on customary Brazilian algorithms.

 *

 * @see http://en.wikipedia.org/wiki/Check_digit

 * @see http://pt.wikipedia.org/wiki/CNPJ#Algoritmo_de_Valida.C3.A7.C3.A3o

 * @see http://en.wikipedia.org/wiki/Cadastro_de_Pessoas_F%C3%ADsicas#Validation

 *

 * @param int|string $numbers Numbers on which generate the check digit

 *

 * @return int

 */

function check_digit($numbers)

{

    $numbers = (string) $numbers;

    $length = strlen($numbers);

    $second_algorithm = $length >= 12;

    $verifier = 0;

    for ($i = 1; $i <= $length; ++$i) {

        if (!$second_algorithm) {

            $multiplier = $i + 1;

        } else {

            $multiplier = ($i >= 9) ? $i - 7 : $i + 1;

        }

        $verifier += $numbers[$length - $i] * $multiplier;

    }

    $verifier = 11 - ($verifier % 11);

    if ($verifier >= 10) {

        $verifier = 0;

    }

    return $verifier;

}