public function delete_group_option(string $id_option, string $id_group): ?int
  {
    if ( $id_option = $this->_get_id_option($id_option) ){
      return $this->db->delete($this->class_cfg['table'], [
        $this->fields['id_option'] => $id_option,
        $this->fields['id_group'] => $id_group
      ]);
    }
    return null;
  }
public function delete_group_option(string $id_option, string $id_group): ?int
  {
    if ( $id_option = $this->_get_id_option($id_option) ){
      return $this->db->delete($this->class_cfg['table'], [
        $this->fields['id_option'] => $id_option,
        $this->fields['id_group'] => $id_group
      ]);
    }
    return null;
  }
public function delete_group_option ( string $ id_option , string $ id_group ) : ? int { if ( $ id_option = $ this -> _get_id_option ( $ id_option ) ) { return $ this -> db -> delete ( $ this -> class_cfg [ 'table' ] , [ $ this -> fields [ 'id_option' ] => $ id_option , $ this -> fields [ 'id_group' ] => $ id_group ] ) ; } return null ; }
Deletes all the given group's permissions for the given option

@param null|string $id_option
@param string $id_group
@return int|null
Deletes all the given group s permissions for the given option