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<?php
declare(strict_types = 1);
namespace byrokrat\checkdigit;
trait AssertionsTrait
{
/**
* Assert that $number contains only numerical characters
*
* @throws InvalidStructureException If $number is not numerical
*/
protected function assertNumber(string $number): void
if (!ctype_digit($number)) {
throw new InvalidStructureException(
"Number can only contain numerical characters, found <$number>"
);
}
byrokrat /
checkdigit
