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<?php class Luhn { public static function getDigit($number) { $number .= 0; $result = self::check($number); echo $result; return (10 - $result); } public static function check($number) { $sum = 0; $numDigits = strlen($number) - 1; $parity = $numDigits % 2; for ($i = $numDigits; $i >= 0; $i--) { $digit = substr($number, $i, 1); if (!$parity == ($i % 2)) {$digit <<= 1;} $digit = ($digit > 9) ? ($digit - 9) : $digit; $sum += $digit; } return (0 == ($sum % 10)); } } $checkd = Luhn::getDigit(1234567891234567891); echo $checkd; var_dump(Luhn::check("1234567891234567891" . $checkd));
Output for git.master, git.master_jit, rfc.property-hooks
10bool(false)

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