interface Boat {
function sink( );
function scuttle( );
function dock( );
}
interface Plane extends Boat {
function takeoff( );
function land( );
function bailout( );
}
class Boatplane implements Plane {
public function sink( ) { }
public function scuttle( ) { }
public function dock( ) { }
public function takeoff( ) { }
public function land( ) { }
public function bailout( ) { }
}
$obj = new Boatplane( );
?>