At 15:26 09.04.2002, Lauri Liinat wrote: >hi all, > > > I'm personally in favour of having MI in PHP, with the serious alternative > > being interfaces. I have failed to understand what interfaces would mean > > in a language such as PHP, though, while I can see the clear hands-on use > > for MI. > >1) the whole concept of interfaces as they are in Java can be thought of >as a *subset* of the functionality of MI (when combined with abstract >classes), and that being said, it is obvious that everything that can >be done with interfaces, can also be done with MI by inheriting >from abstract classes (as you would in C++). but with MI you can do >even more - you can multiply inherit implementation. so, why cut off >possibilities? i agree with Zeev here, MI is definitely superior to >interfaces. > >2) interfaces lose their meaning in a loosely-typed language such as PHP, >which is so dynamic that no attribute nor method declarations are >required in order to write code around an object. interfaces are nothing but >abstract classes, which do not allow implementation or instantiation. >but you do not even have abstract classes in PHP - the compiler doesn't >prevent you from trying to call a method that isn't there... the error pops up >as late as at runtime. in PHP, object interfaces only exist in the heads >of the >programmers, not in the compiler, they just aren't there. this way, it doesn't >matter if programmers draw interfaces on sand using UML in order to >communicate with each other, PHP compiler does not need to know about >interfaces. therefore, interfaces really do sound kind of silly in the context >of the PHP language. > >regards, >lauri >
totally correct. but some people here like me want to have some control in the engine that allows detection of missuse of class modells. That is i supply a class package and the user says hey your package does not work and i say hey you missused the package and can present him with the errorlog. marcus -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
