{ public function bf(); } interface c { public function cf(); } class x implements a, b, c { public function af() { echo 'af<br/>'; } public function aaf() { echo 'aaf<br/>'; } public function bf() { echo 'bf<br/>'; } public function cf() { echo 'cf<br/>'; } } $xy = new x(); $xy->af(); $xy->aaf(); $xy->bf(); $xy->cf();