interface IAA { public function method(); } interface IAB { public function method2(); } interface IAC extends IAA, IAB { public function method3(); } class AC implements IAC { public function method() { echo "method" . PHP_EOL; } public function method2() { echo "method2" . PHP_EOL; } public function method3() { echo "method3" . PHP_EOL; } } $ac = new AC(); $ac->method(); $ac->method2(); $ac->method3();