original_string: public function getInvalidField($field)
      {
          $value = isset($this->_invalid[$field]) ? $this->_invalid[$field] : null;
  
          return $value;
      }
code: public function getInvalidField($field)
      {
          $value = isset($this->_invalid[$field]) ? $this->_invalid[$field] : null;
  
          return $value;
      }
code_tokens: public function getInvalidField ( $ field ) { $ value = isset ( $ this -> _invalid [ $ field ] ) ? $ this -> _invalid [ $ field ] : null ; return $ value ; }
docstring: Get a single value of an invalid field. Returns null if not set.
  
  @param string $field The name of the field.
  @return mixed
docstring_tokens: Get a single value of an invalid field . Returns null if not set .