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<?php
declare(strict_types = 1);
namespace byrokrat\checkdigit;
/**
* Modulo97 calculator
*/
class Modulo97 implements Calculator
{
use AssertionsTrait;
* Check if the last two digits of number are valid modulo 97 check digits
public function isValid(string $number): bool
$this->assertNumber($number);
return bcmod($number, '97') === '1';
}
* Calculate the modulo 97 check digits for number
public function calculateCheckDigit(string $number): string
return (string)(98 - bcmod($number.'00', '97'));
byrokrat /
checkdigit
