Re: PHP class question

Peter van der Does wrote:

I have the following situation. I wrote some software and split it up into functionality: class core { function go{ } } class A extends core { // PHP4 constructor function A {

    $this->go();

} } class B extends core { } In core I define functions and variables that are to be used through out my program and to address those functions/variables I just use $this-> . Now I ran into a situation where class A needs to be extended with another class. This is not my choice, it's part of a framework I have to use. Currently I solved this by doing this: class A extends framework_class { $var core; // PHP4 constructor function A {

    $this->core = new core();
    $this->core->go();

} } The question I have, is this a good solution, is it the only solution or are there different ways to tackle this? As you might see it needs to run in PHP4.

has to extend? if it *has* to extend then you have no choice, but you may want to look up on class inheritance, specifically inheritance vs composition. also the "isa" / "hasa" rule /should/ always apply. which one of the following is true 1: A isa framework_class_name 2: A hasa framework_class_name if it's 1 then you extend if it's 2 then A should contain an instance of framework_class eg: class A { var $framework_class = new framework_class_name(); } you can also always proxy the methods you need. all in, this appears to be a design pattern issue and really can't help any more unless you give some specifics. (like the source of your classes and the framework class you need to extend) regards, nathan incidentally, I play inheritance vs composition as game with my 4 year old son, and he's really good - the untainted mind of a child can easily solve things us older types find more complex. eg: car isa wheel, car hasa wheel