This will result in fatal error, since you are calling this method statically (::) and inside this method you are using $this special variable, that refers to workingClass(object from which it was called) and workingClass has no getId method.

This will result in fatal error, since you are calling this method statically (::) and inside this method you are using $this special variable, that refers to workingClass(object from which it was called) and workingClass has no getId method.

OK, now after fixing the example I can say that it will output 'hello', because when calling method from the object ($this->) PHP will always run one defined in latest child class.