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<?php |
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declare(strict_types = 1); |
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namespace DummyGenerator\Core\Calculator; |
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use DummyGenerator\Definitions\Calculator\IbanCalculatorInterface; |
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/** |
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* Utility class for working with IBAN numbers |
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*/ |
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class IbanCalculator implements IbanCalculatorInterface |
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{ |
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public function checksum(string $iban): string |
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{ |
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// Move first four digits to end and set checksum to '00' |
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$checkString = substr($iban, 4) . substr($iban, 0, 2) . '00'; |
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// Replace all letters with their number equivalents |
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$checkString = preg_replace_callback('/[A-Z]/', fn (array $a) => $this->alphaToNumberCallback($a), $checkString) ?? ''; |
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// Perform mod 97 and subtract from 98 |
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$checksum = 98 - $this->mod97($checkString); |
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return str_pad((string) $checksum, 2, '0', STR_PAD_LEFT); |
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} |
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public function isValid(string $iban): bool |
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{ |
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return $this->checksum($iban) === substr($iban, 2, 2); |
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} |
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/** |
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* Convert a letter to a number. |
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* |
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* @param array<int|string, string> $match |
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*/ |
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protected function alphaToNumberCallback(array $match): string |
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{ |
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return (string) $this->alphaToNumber($match[0]); |
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} |
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/** |
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* Converts letter to number |
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*/ |
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protected function alphaToNumber(string $char): int |
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{ |
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return ord($char) - 55; |
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} |
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/** |
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* Calculates mod97 number on a numeric string |
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*/ |
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protected function mod97(string $number): int |
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{ |
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$checksum = (int) $number[0]; |
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for ($i = 1, $size = strlen($number); $i < $size; ++$i) { |
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$checksum = (10 * $checksum + (int) $number[$i]) % 97; |
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} |
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return $checksum; |
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} |
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} |
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johnykvsky /
dummygenerator
