original_string: public function get($index)
      {
          if (!isset($this->_streams[$index])) {
              throw new InvalidArgumentException("Unexisting stream index `{$index}`.");
          }
          return $this->_streams[$index];
      }
code: public function get($index)
      {
          if (!isset($this->_streams[$index])) {
              throw new InvalidArgumentException("Unexisting stream index `{$index}`.");
          }
          return $this->_streams[$index];
      }
code_tokens: public function get ( $ index ) { if ( ! isset ( $ this -> _streams [ $ index ] ) ) { throw new InvalidArgumentException ( "Unexisting stream index `{$index}`." ) ; } return $ this -> _streams [ $ index ] ; }
docstring: Return a contained stream.
  
  @param  integer $index An index.
  @return object
docstring_tokens: Return a contained stream .