Let's first create

parent

and

grandparent

clases

class A {
    public static function who() {
        echo __CLASS__;
    }
}

class B extends A {
    public static function who() {
        parent::who();
    }
}

One way to call grandparent's

who

method is to use the grandparent class name

A

class C extends B {
    public static function who() {
        A::who();
    }
}

C::who();

Another way is to call

who

method of parent class which also calls its parent class (which is grandparent for

C

class)

class C extends B {
    public static function who() {
        parent::who();
    }
}

C::who();