original_string: public function readBytes($num)
      {
          $returnValue = substr($this->_data, $this->_position, $num);
          $this->_position += $num;
  
          return $returnValue;
      }
code: public function readBytes($num)
      {
          $returnValue = substr($this->_data, $this->_position, $num);
          $this->_position += $num;
  
          return $returnValue;
      }
code_tokens: public function readBytes ( $ num ) { $ returnValue = substr ( $ this -> _data , $ this -> _position , $ num ) ; $ this -> _position += $ num ; return $ returnValue ; }
docstring: Read num bytes from the current position in the file
  and advances the file pointer.
  
  @param  integer $num
  @return string
docstring_tokens: Read num bytes from the current position in the file and advances the file pointer .