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

@param   string/array    $fields
Order by ascending