note 108178 added to language.oop5.interfaces

I just learned that you can cast a function using an abstract interface definition rather than referring to a specific class that implements it. e.g.: interface myInterface { public function someFunction(); } class myClassA implements myInterface { public function someFunction() { // does something } } class myClassB { public function castFunction(myInterface $obj) { // do something with object } } This will be VERY useful for abstraction as I don't have to name specific implementations of an interface, but can instead just use the interface to verify whatever object it is that is being passed in still has expected functionality. My question now is, is there any way you can cast using multiple interfaces? ---- Server IP: 69.147.83.197 Probable Submitter: 173.13.3.241 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.interfaces.php Edit -- https://master.php.net/note/edit/108178 Del: integrated -- https://master.php.net/note/delete/108178/integrated Del: useless -- https://master.php.net/note/delete/108178/useless Del: bad code -- https://master.php.net/note/delete/108178/bad+code Del: spam -- https://master.php.net/note/delete/108178/spam Del: non-english -- https://master.php.net/note/delete/108178/non-english Del: in docs -- https://master.php.net/note/delete/108178/in+docs Del: other reasons-- https://master.php.net/note/delete/108178 Reject -- https://master.php.net/note/reject/108178 Search -- https://master.php.net/manage/user-notes.php