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Date: Wed, 17 Dec 2014 13:14:55 +0000
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To: "guilhermeblanco@gmail.com" <guilhermeblanco@gmail.com>, Derick Rethans <derick@php.net>
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Content-Type: multipart/alternative; boundary=001a11c3714a08192f050a6943cf
Subject: Re: [PHP-DEV] [RFC][VOTE] Objects as Keys
From: etienne.kneuss@epfl.ch (Etienne Kneuss)

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On Wed Dec 17 2014 at 1:44:13 PM guilhermeblanco@gmail.com <
guilhermeblanco@gmail.com> wrote:

> Hi,
>
> Answering the question of Christopher Becker. It is not possible to
> traverse and get your desired elements.
> How would you achieve a foreach by key (returning object) without having to
> store a separate list and track by hash or through an interface?
>
>
Which is one of the main problem with this very RFC.

What ends up being stored in the array is the hash, not the object. And
there is no immediate way of getting the key object back. The user writes:
  $arr = array($obj => 2);  but key($arr) returns the hash only.

As I said in the original discussion: this RFC is actually about having an
implicit call to __hash() whenever an object is used as an array key. You
can achieve exactly the same in userland with an explicit call.

I would rather wait (maybe indefinitely) to have a proper implementation of
objects as keys than have this compromise.

Best,

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