original_string: public function sortKeys($options = SORT_REGULAR, $descending = false)
      {
          $items = $this->items;
  
          $descending ? krsort($items, $options) : ksort($items, $options);
  
          return new static($items);
      }
code: public function sortKeys($options = SORT_REGULAR, $descending = false)
      {
          $items = $this->items;
  
          $descending ? krsort($items, $options) : ksort($items, $options);
  
          return new static($items);
      }
code_tokens: public function sortKeys ( $ options = SORT_REGULAR , $ descending = false ) { $ items = $ this -> items ; $ descending ? krsort ( $ items , $ options ) : ksort ( $ items , $ options ) ; return new static ( $ items ) ; }
docstring: Sort the collection keys.
  
  @param  int  $options
  @param  bool  $descending
  @return static
docstring_tokens: Sort the collection keys .