Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:81541
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.212.176 as permitted sender)
Message-ID: <54CE817A.1020703@gmail.com>
Date: Sun, 01 Feb 2015 19:41:46 +0000
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0
MIME-Version: 1.0
To: internals <internals@lists.php.net>
References: <CALW=WECRvkHOJXre3s26K0zGic4d1m5pVQVOKT0=ssO9heyyAw@mail.gmail.com>	<CAH-PCH5pCZzfWLHGeU-0DRv5UfnXbp1aztGRnaNQb1zRH6A2ag@mail.gmail.com>	<CALW=WEC=_ZzBKVeUCMTrHAxCa4EVZZnaThsa6L6a9BTChgQQTg@mail.gmail.com>	<54CD52D9.4070105@gmail.com> <CALW=WEBMdqpDzoQeJAO7yhdE8C-01Rt-Zfqj-U9vNvzQQVXFDg@mail.gmail.com>
In-Reply-To: <CALW=WEBMdqpDzoQeJAO7yhdE8C-01Rt-Zfqj-U9vNvzQQVXFDg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] Use "caller" keyword, to access object caller.
From: rowan.collins@gmail.com (Rowan Collins)

On 31/01/2015 23:42, S.A.N wrote:
> Yes, you're right, in PHP you can solve this problem by other methods, I know...
>
> But the problem is that PHP is no nice and convenient for solving this problem.
> So I suggested to add new keyword, not to do manually bindTo($this)
> for each methods.

Have a closer look at my example; the point is that without bindTo, 
there is no way of doing the *first* part of your JS example, i.e. 
attaching the same function/method to two objects - there is no 
equivalent of this line:

oA.getHolder = getHolder


In your PHP example, you introduce an extra object, $c, which doesn't 
exist in your JS example; if it did, it would look like this:

var oA = new A
var oB = new B
var oC = new C

oA.myC = oC;
oB.myC = oC;
oC.getHolder = getHolder

oA.myC.getHolder() // returns C
oB.myC.getHolder() // returns C


Hopefully you can see that that makes all the difference - myHolder is 
now always called from the same object, the one created with "new C".

The reason this doesn't translate well is that In JS, a method is just a 
property which happens to be a closure, so "this" is necessarily dynamic 
- there is no class definition to define the relationship between the 
method and the object (ES6 introduces all sorts of variations and 
caveats to this, all of which can be emulated in older versions). In 
PHP, a method is fundamentally different from functions, closures, and 
properties, despite similarities in syntax, so none of the same 
behaviours would make sense.

Regards,

-- 
Rowan Collins
[IMSoP]