覆盖父方法得到了

Question

Why does the code below:

class A {   
    public function foo() {}
}

class B extends A { 
    private function foo() {}
}

generates an fatal error while this:

class A {
    private function foo() {}   
}

class B extends A {
    public function foo() {}    
}

doesn't although the documentation says "If the child doesn't see the parent's private methods, the child can't override them"?

Answer 1

It is all about semantic. In first example in method foo of class B you can call parent method foo of class A using parent::foo(), but he is a private.