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Merge pull request #56 from nguyenanhung/v3.2.0-develop
V3.2.0 develop
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| <?php | ||
|
|
||
| defined('BASEPATH') or exit('No direct script access allowed'); | ||
|
|
||
| /** | ||
| * Luhn algorithm. | ||
| * | ||
| * The Luhn algorithm or Luhn formula, also known as the "modulus 10" or | ||
| * "mod 10" algorithm, is a simple checksum formula used to validate a | ||
| * variety of identification numbers, such as credit card numbers, | ||
| * IMEI numbers, National Provider Identifier numbers in the US, and | ||
| * Canadian Social Insurance Numbers. It was created by IBM scientist | ||
| * Hans Peter Luhn and described in U.S. Patent No. 2,950,048, filed | ||
| * on January 6, 1954, and granted on August 23, 1960. | ||
| * | ||
| * Originally: https://github.com/selective-php/luhn/blob/master/src/Luhn.php | ||
| */ | ||
| #[AllowDynamicProperties] | ||
| class CI_Luhn | ||
| { | ||
| /** | ||
| * Returns the luhn check digit. | ||
| * | ||
| * @param string $numbers Numbers as string | ||
| * | ||
| * @return int Checksum digit | ||
| */ | ||
| public function create(string $numbers): int | ||
| { | ||
| $this->validateNumericString($numbers); | ||
|
|
||
| // Add a zero check digit | ||
| $numbers .= '0'; | ||
| $sum = 0; | ||
| // Find the last character | ||
| $i = strlen($numbers); | ||
| $odd_length = $i % 2; | ||
| // Iterate all digits backwards | ||
| while ($i-- > 0) { | ||
| // Add the current digit | ||
| $sum += $numbers[$i]; | ||
| // If the digit is even, add it again. Adjust for digits 10+ by subtracting 9. | ||
| if ($odd_length === ($i % 2) && $numbers[$i] > 4) { | ||
| $sum += ((int)$numbers[$i] - 9); | ||
| } | ||
| if ($odd_length === ($i % 2) && $numbers[$i] <= 4) { | ||
| $sum += $numbers[$i]; | ||
| } | ||
| } | ||
|
|
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| return (10 - ($sum % 10)) % 10; | ||
| } | ||
|
|
||
| /** | ||
| * Check luhn number. | ||
| * | ||
| * @param string $number The number to validate | ||
| * | ||
| * @return bool Status | ||
| */ | ||
| public function validate(string $number): bool | ||
| { | ||
| $this->validateNumericString($number); | ||
|
|
||
| $sum = 0; | ||
| $numDigits = strlen($number) - 1; | ||
| $parity = $numDigits % 2; | ||
|
|
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| for ($i = $numDigits; $i >= 0; $i--) { | ||
| $digit = (int)substr($number, $i, 1); | ||
| if (!$parity == ($i % 2)) { | ||
| $digit <<= 1; | ||
| } | ||
| $digit = ($digit > 9) ? ($digit - 9) : $digit; | ||
| $sum += $digit; | ||
| } | ||
|
|
||
| return 0 == ($sum % 10); | ||
| } | ||
|
|
||
| /** | ||
| * Validate numeric string. | ||
| * | ||
| * @param string $number The number to validate | ||
| * | ||
| * @return void | ||
| */ | ||
| private function validateNumericString(string $number): void | ||
| { | ||
| if (!preg_match('/^\d+$/', $number)) { | ||
| throw new InvalidArgumentException(sprintf('An invalid numeric value was given: %s', $number)); | ||
| } | ||
| } | ||
| } |
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