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Date: Fri, 30 Jan 2015 17:43:33 +0100
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To: "S.A.N" <ua.san.alex@gmail.com>
Cc: internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Use "caller" keyword, to access object caller.
From: tyra3l@gmail.com (Ferenc Kovacs)

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On Fri, Jan 30, 2015 at 3:53 AM, S.A.N <ua.san.alex@gmail.com> wrote:

> The reason for creating circular references, usually due to the need to
> bind objects.
>
> But this relationship can often be obtained from the context of the call.
>
> It will be very convenient to have a keyword that will return reference t=
o
> an object, which caused this object.
>
> Sorry for my English, I'm not a native speaker.
> A simple example below shows the behavior that we need.
>
> <?php
>
> class A
> {
>     public function __construct() {
>         $this->object =3D new C;
>     }
> }
>
> class B
> {
>     public function __construct() {
>         $this->object =3D new C;
>     }
> }
>
> class C
> {
>     public function getCaller() {
>         return caller::class;
>     }
> }
>
> $a =3D new A;
> $b =3D new B;
> $c =3D new C;
>
> $a->object->getCaller(); // return A
> $b->object->getCaller(); // return B
>
> $c->getCaller(); // Fatal Error - undefined caller context
>
> ?>
>
> Create a new keyword can cause problems with backward compatibility...
> Perhaps you can solve a problem to using an existing keyword?
>
> Thank you for any feedback.
>

see the previous discussion on this topic:
http://grokbase.com/t/php/php-internals/099g86x7k6/reference-caller-object
I think having it as a magic constant would be better, but I still don't
like the idea (it is already possible, there aren't really a good usecase
for it, the example you mentioned is a prime example how would it be
misused to cause debugging nightmares, etc.).

--=20
Ferenc Kov=C3=A1cs
@Tyr43l - http://tyrael.hu

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