public function group_has(string $id_option, string $id_group): bool
  {
    return (bool)$this->_retrieve_ids($id_option, null, $id_group);
  }
public function group_has(string $id_option, string $id_group): bool
  {
    return (bool)$this->_retrieve_ids($id_option, null, $id_group);
  }
public function group_has ( string $ id_option , string $ id_group ) : bool { return ( bool ) $ this -> _retrieve_ids ( $ id_option , null , $ id_group ) ; }
Checks if a group has the given preference

@param string $id_option
@param string $id_group
@return bool
Checks if a group has the given preference