public function upperWords($delimiters = " \t\r\n\f\v")
    {
        return static::of(
            mb_ucwords($this->contents, $delimiters, $this->encoding),
            $this->encoding
        );
    }
public function upperWords($delimiters = " \t\r\n\f\v")
    {
        return static::of(
            mb_ucwords($this->contents, $delimiters, $this->encoding),
            $this->encoding
        );
    }
public function upperWords ( $ delimiters = " \t\r\n\f\v" ) { return static :: of ( mb_ucwords ( $ this -> contents , $ delimiters , $ this -> encoding ) , $ this -> encoding ) ; }
Return the string with all the words in upper case.

Delimiters are used to determine what is a word.

@param string $delimiters

@return Rope
Return the string with all the words in upper case .