Re: PHP5: Problem concerning multiple inheritance / interfaces

Hello vivi, Wednesday, February 4, 2004, 5:19:40 PM, you wrote: > Hello at all, > ok my problem in a nutshell: i need multiple inheritance! is there a > solution to fake this functionallity in php5? > i have the following problem: > the goal is to implement my own DomXML implementation based on the existing > DomNode, DomDocument, Dom... Classes. > thus, i implement my classes as follows: > class MyNode extends DomNode {} // that isn't the problem > class MyDocument extends DomDocument {} // would be fine, but... > this would be an easy solution, but there is a logical problem: > if i extend the DomNode (with the methods in MyNode) then -i think- > MyDocument should have those extended methods, too. > so i could write: > class MyDocument extends MyNode {} // problem > but now i'm missing all the nice methods of DomDocument!! > multiple inheritance would solve this problem: > class MyDocument extends MyNode,DomDocument {} // not possible > by the way: i will get into trouble with all Dom-Classes: > class MyElement extends MyNode,DomElement {} > class MyAttribute ... > Hope you'll understand me? > Is there a way to solve this problem? > I'm thinking about the new __call() method implemented as follows: > class MyDocument extends MyNode { > function __call($method, $params) { // fake solution > ... > eval("DomDocument::$method($paramsString);"); > } > } > but with a fake solution like this i wouldn't get all methods with > get_class_methods() and that wouldn't be that nice:) > Can Interfaces help me? > Thanks for your efforts.. At least interfaces would force you to implement the same set of additional functions in each derived class. However interfaces cannot have bodys and hence you need to provide the code for each derived class separatley; with the ability to make mistakes or real errors. interface extended_dom { function myFunction(); } class MyNode extends DomNode implements extended_dom {} class MyDocument extends DomDocument implements extended_dom {} But this is a question for general@php.net Best regards, Marcus mailto:helly@php.net