public function desc($fields) {
        if (is_array($fields)) {
            $this->_order = ' ORDER BY ' . implode($fields, ', ') . ' DESC';
        } else {
            $this->_order = ' ORDER BY ' . $fields . ' DESC';
        }
         
        return $this;
    }
public function desc($fields) {
        if (is_array($fields)) {
            $this->_order = ' ORDER BY ' . implode($fields, ', ') . ' DESC';
        } else {
            $this->_order = ' ORDER BY ' . $fields . ' DESC';
        }
         
        return $this;
    }
public function desc ( $ fields ) { if ( is_array ( $ fields ) ) { $ this -> _order = ' ORDER BY ' . implode ( $ fields , ', ' ) . ' DESC' ; } else { $ this -> _order = ' ORDER BY ' . $ fields . ' DESC' ; } return $ this ; }
Order by descending

@param   string/array    $fields
Order by descending