php static property

Question

I have two code snippets (regarding the static keyword) which I expect them to have same output, but actually the outputs are different.

The question is

Answer 1

Since the sub2 class does not have var2 it takes the value of the base2 class.So when u assigned a new value using this sub2::$var2 = 2; it changed to new value.

In first code you have overridden that in your extended class.Both variable have scope inside their respective classes.