original_string: public function key()
      {
          $extractor = $this->_key;
  
          return $extractor($this->_fetchCurrent(), parent::key(), $this);
      }
code: public function key()
      {
          $extractor = $this->_key;
  
          return $extractor($this->_fetchCurrent(), parent::key(), $this);
      }
code_tokens: public function key ( ) { $ extractor = $ this -> _key ; return $ extractor ( $ this -> _fetchCurrent ( ) , parent :: key ( ) , $ this ) ; }
docstring: Returns the current iteration key
  
  @return mixed
docstring_tokens: Returns the current iteration key