original_string: public function getCardNumber() : ?string 
      {
          if ( ! $this->hasCardNumber()) {
              $this->setCardNumber($this->getDefaultCardNumber());
          }
          return $this->cardNumber;
      }
code: public function getCardNumber() : ?string 
      {
          if ( ! $this->hasCardNumber()) {
              $this->setCardNumber($this->getDefaultCardNumber());
          }
          return $this->cardNumber;
      }
code_tokens: public function getCardNumber ( ) : ? string { if ( ! $ this -> hasCardNumber ( ) ) { $ this -> setCardNumber ( $ this -> getDefaultCardNumber ( ) ) ; } return $ this -> cardNumber ; }
docstring: Get card number
  
  If no "card number" value has been set, this method will
  set and return a default "card number" value,
  if any such value is available
  
  @see getDefaultCardNumber()
  
  @return string|null card number or null if no card number has been set
docstring_tokens: Get card number