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<?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('4417123456789114'); } catch (ECommerce\CreditCardValidationException $exception) { echo 'Invalid credit card number'; } finally { echo 'DONE'; } }

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