- array_map: documentation ( source)
- array_sum: documentation ( source)
- str_split: documentation ( source)
- strval: documentation ( source)
<?php
namespace ECommerce {
use Exception;
class CreditCardValidationException extends Exception {
}
class CreditCardNumber {
private $digits;
public function __construct($digits) {
$this->digits = $digits;
if (!$this->_validate()) {
throw new CreditCardValidationException('Checksum failed');
}
}
private function _validate() {
for($i=0,$t=0;$i<16;$i+=2)
$t+=(($d=((int)$this->digits{$i}*2))>9?array_sum(array_map('intval',str_split(strval($d)))):$d)+$this->digits{$i+1};
return(bool)($t%10===0);
}
}
}
namespace {
try {
$ccn = new ECommerce\CreditCardNumber('4417123456789113');
} catch (ECommerce\CreditCardValidationException $exception) {
echo 'Invalid credit card number';
}
}