PHP--new self () and new static

See an excerpt from the online code

classA { Public Static functionget_self () {return NewSelf (); }    Public Static functionget_static () {return New Static(); }} classBextendsA {}Echo Get_class(B::get_self ());//AEcho Get_class(B::get_static ());//BEcho Get_class(A::get_static ());//A

Popular point is:

New self (); In which class executes the code, which returns the object of the class. If the code is written only in the parent class, even if the subclass inherits from the parent class, the returned object is still the parent class.

New Static (); Which class calls it, returns the object of which class.

PHP--new self () and new static