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<?php namespace Faker\Calculator; class Iban { /** * Generates IBAN Checksum * * @return string Checksum (numeric string) */ public static function checksum(string $iban): string { // Move first four digits to end and set checksum to '00' $checkString = substr($iban, 4) . substr($iban, 0, 2) . '00'; // Replace all letters with their number equivalents $checkString = preg_replace_callback('/[A-Z]/', ['self', 'alphaToNumberCallback'], $checkString); // Perform mod 97 and subtract from 98 $checksum = 98 - self::mod97($checkString); return str_pad((string) $checksum, 2, '0', STR_PAD_LEFT); } private static function alphaToNumberCallback(array $match): int { return self::alphaToNumber($match[0]); } /** * Converts letter to number */ public static function alphaToNumber(string $char): int { return ord($char) - 55; } /** * Calculates mod97 on a numeric string * * @param string $number Numeric string */ public static function mod97(string $number): int { $checksum = (int) $number[0]; for ($i = 1, $size = strlen($number); $i < $size; ++$i) { $checksum = (10 * $checksum + (int) $number[$i]) % 97; } return $checksum; } /** * Checks whether an IBAN has a valid checksum */ public static function isValid(string $iban): bool { return self::checksum($iban) === substr($iban, 2, 2); } }
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