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<?php namespace Faker\Calculator; class Inn { /** * Generates INN Checksum * * https://ru.wikipedia.org/wiki/%D0%98%D0%B4%D0%B5%D0%BD%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B9_%D0%BD%D0%BE%D0%BC%D0%B5%D1%80_%D0%BD%D0%B0%D0%BB%D0%BE%D0%B3%D0%BE%D0%BF%D0%BB%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D1%89%D0%B8%D0%BA%D0%B0 * * @param string $inn * @return string Checksum (one digit) */ public static function checksum($inn) { $multipliers = array(1 => 2, 2 => 4, 3 => 10, 4 => 3, 5 => 5, 6 => 9, 7 => 4, 8 => 6, 9 => 8); $sum = 0; for ($i = 1; $i <= 9; $i++) { $sum += intval(substr($inn, $i-1, 1)) * $multipliers[$i]; } return strval(($sum % 11) % 10); } /** * Checks whether an INN has a valid checksum * * @param string $inn * @return boolean */ public static function isValid($inn) { return self::checksum(substr($inn, 0, -1)) === substr($inn, -1, 1); } }