original_string: public function fetch($type = parent::FETCH_TYPE_NUM)
      {
          $callback = $this->_callback;
          $row = $this->_statement->fetch($type);
  
          return $row === false ? $row : $callback($row);
      }
code: public function fetch($type = parent::FETCH_TYPE_NUM)
      {
          $callback = $this->_callback;
          $row = $this->_statement->fetch($type);
  
          return $row === false ? $row : $callback($row);
      }
code_tokens: public function fetch ( $ type = parent :: FETCH_TYPE_NUM ) { $ callback = $ this -> _callback ; $ row = $ this -> _statement -> fetch ( $ type ) ; return $ row === false ? $ row : $ callback ( $ row ) ; }
docstring: Fetch a row from the statement.
  
  The result will be processed by the callback when it is not `false`.
  
  @param string $type Either 'num' or 'assoc' to indicate the result format you would like.
  @return array|false
docstring_tokens: Fetch a row from the statement .