/**
* Test if card number is valid.
*
* @param string $card
* @return bool
*/
public static function isValid($card)
{
return substr($card, 0, 1) == 5 and parent::isValid($card);
}
/**
* Sanitize the card number.
*
* @param string $card
* @return mixed
*/
public static function sanitize($card)
{
$sanitized = filter_var(strip_tags(parent::unMask($card)), FILTER_SANITIZE_NUMBER_INT);
return self::mask($sanitized);
}
