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Date: Thu, 25 Feb 2021 22:36:28 +0100
Message-ID: <CADeZBNbeFDQ+bZBrc-JZp8js=-80RLyn6oeBwmyut9zR522Sjg@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC] Static variables in inherited methods
From: glash.gnome@gmail.com (Glash Gnome)

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I can understand that some people coming from C++, Java may be shocked by
the behavior of a static variable in a static function.
And the need to improve things.

Maybe can you add *virtual static* keywords as a replacement for old
behavior in your RFC <https://wiki.php.net/rfc/static_variable_inheritance>
. You would satisfy me.

class A {
    static function Counter() {
        static $count =3D 0;
        virtual static $i =3D 1;
        return [++$count, $i++];
    }
}
class B extends A {}

var_dump(A::Counter()); // array(int(1), int(1))
var_dump(A::Counter()); // array(int(2), int(2))
var_dump(B::Counter()); // array(int(3), int(1))
var_dump(B::Counter()); // array(int(4), int(2))

A::Counter::$count =3D 665; // Great Feature

A::Counter::$i =3D 0; //Initialize

B::Counter::$i =3D 0; //Reset


In C Poo we could get :

/*header*/
typedef struct _A {// Instance class A
} A;
typedef struct _AClass {// vtable class A

  int counter_i;// php: virtual static $i

  void (*counter)(void);// php: public static function counter(){}

} AClass;

typedef struct _B {// Instance class B  A parent_instance;
} B;
typedef struct _BClass {// vtable class B  AClass parent_class;// B
contains its own virtual static variable $i
} BClass;

/*source*/

int A_counter_count =3D 0;// What did you expect ?
//...

A_counter_count =3D 665;// php: A::Counter::$count=3D665;

A_class_entity.i =3D 0;// php: A::Counter::$i=3D0;

B_class_entity.i =3D 0;// php: B::Counter::$i=3D0;



Best regards,

Serge




Le mar. 23 f=C3=A9vr. 2021 =C3=A0 15:02, Nikita Popov <nikita.ppv@gmail.com=
> a =C3=A9crit :

> Hi internals,
>
> While looking into various issues related to static variable handling, I'=
ve
> become increasingly convinced that our handling of static variables in
> inherited methods is outright buggy. However, it's also long-standing
> behavior, so I've put up an RFC:
>
> https://wiki.php.net/rfc/static_variable_inheritance
>
> Regards,
> Nikita
>

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