PHP Classes

File: src/Filter/Special/CreditCardNumberFilter.php

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File: src/Filter/Special/CreditCardNumberFilter.php
Role: Class source
Content type: text/plain
Description: Class source
Class: Ionizer PHP Filter Input
Filter input values by chaining filter objects
Author: By
Last change:
Date: 1 year ago
Size: 1,666 bytes
 

Contents

Class file image Download
<?php
declare(strict_types=1);
namespace
ParagonIE\Ionizer\Filter\Special;

use
ParagonIE\ConstantTime\Binary;
use
ParagonIE\Ionizer\Filter\StringFilter;
use
ParagonIE\Ionizer\InvalidDataException;

/**
 * Class CreditCardNumberFilter
 * @package ParagonIE\Ionizer\Filter\Special
 */
class CreditCardNumberFilter extends StringFilter
{
    public function
__construct()
    {
       
$this->addCallback([__CLASS__, 'validateCreditCardNumber']);
    }

   
/**
     * Validate a credit card number, based on input length and Luhn's Algorithm
     *
     * @param string $input
     *
     * @return string
     * @throws InvalidDataException
     */
   
public static function validateCreditCardNumber(string $input): string
   
{
       
// Strip all non-decimal characters
       
$stripped = \preg_replace('/[^0-9]/', '', $input);
       
/** @var int $length */
       
$length = Binary::safeStrlen($stripped);
        if (
$length < 13 || $length > 19) {
            throw new
InvalidDataException('Invalid credit card number (invalid length)');
        }
       
/** @var array<int, string> $split */
       
$split = \str_split($stripped, 1);

       
/** @var int $calc */
       
$calc = 0;
       
/** @var int $l */
       
$l = \count($split);
        for (
$i = 0; $i < $l; ++$i) {
           
/** @var int $n */
           
$n = (int) ($split[$l - $i - 1]) << ($i & 1);
            if (
$n > 9) {
               
$n = ((int) ($n / 10)) + ($n % 10);
            }
           
$calc += $n;
        }

        if (
$calc % 10 !== 0) {
            throw new
InvalidDataException('Invalid credit card number (Luhn)');
        }
        return
$stripped;
    }
}