How to force a variable to be a custom object?

[Alex Gemmell <agemmell@xxxxxxxxx>]

Hi all,

Just a quickie today: I was wondering if I can declare a Class variable 
as a certain type of object.  I'm using PHP 4 by the way.

For example, if my class looks like this:

class myClass {

	var $object;

	function someFunction() {
		// code, code, code ....
	}
}

Is there anyway I can limit the variable "$object" to be of a particular 
Class of object that I have made.  Something like:

class myClass {

	var $object *type=myOtherClass*;

	function someFunction() {
		// code, code, code ....
	}
}

Yes, yes, I know "*type=myOtherClass*" isn't PHP code, but do you see 
what I'm getting at?  How would I achieve this?  Is it even possible?

And would I then also have to include/require the path to the 
"myOtherClass" definition script in the myClass definition?
e.g.

class myClass {
	*require_once('path/to/myOtherClass.php');*

	var $object *type=myOtherClass*;

	function someFunction() {
		// code, code, code ....
	}
}

Any ideas folks?

All the best,

Alex

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