Can I instantiate a PHP class inside another class?

Question

I was wondering if it is allowed to create an instance of a class inside another class.

Or, do I have to create it outside and then pass it in through the constructo

Answer 1

No, it is not possible. Nesting classes and aggregating objects are diffrent mechanisms. Nesting classes means nesting class names, in fact. Class A nested in class B would be named "B\A" (?). From v5.3 you can nest class names (and some other names) in namespaces.