note 79760 deleted from language.oop5.interfaces by felipe

Note Submitter: ndasilva at rap dot midco dot net ---- Some interesting less-than-documented behavior. As shown below, interfaces support inheritance, and implementing multiple interfaces which inherit from the same "parent" interface will *not* cause method name clashes. Observe: <?php // Interface declarations: interface Ia { public function Foo(); } interface Ib extends Ia { public function FooBar(); } interface Ic extends Ia { public function Footurama(); } // Now let's implement them... class AB implements Ib, Ic { public function Foo() { } public function FooBar() { } public function Footurama() { } } $ab = new AB(); ?> It just becomes a matter of remembering to declare concrete methods for every interface-defined method, which could get a bit hard to read. I've already had to use this once in an app in which a User object implemented an IUser interface and extended a DB_Object class, which in turn implemented an IDB_Object interface (for decorator purposes), and both IUser and IDB_Object had a Find() method declared. Both were using the exact same Find() method, so I just put that into another interface, IFindable, and set both IUser and IDB_Object to extend IFindable. Good times.