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<?php
declare(strict_types = 1);
namespace byrokrat\checkdigit;
abstract class Base
{
/**
* Validate number sructure, returns number if structure is valid
*
* @throws InvalidStructureException If $number is not numerical
*/
protected function validateNumber(string $number)
if (!ctype_digit($number)) {
throw new InvalidStructureException(
"Number can only contain numerical characters, found <$number>"
);
}
byrokrat /
checkdigit
