public function remove($fieldname)
    {
        if (isset($this->fields[$fieldname]))
            unset($this->fields[$fieldname]);

        return $this;
    }
public function remove($fieldname)
    {
        if (isset($this->fields[$fieldname]))
            unset($this->fields[$fieldname]);

        return $this;
    }
public function remove ( $ fieldname ) { if ( isset ( $ this -> fields [ $ fieldname ] ) ) unset ( $ this -> fields [ $ fieldname ] ) ; return $ this ; }
remove field from list
@param $fieldname
@return $this
remove field from list