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Date: Wed, 04 Jan 2006 12:50:56 +0100
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To: Stanislav Malyshev <stas@zend.com>
Cc: Marcus Boerger <helly@php.net>,
	php internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] __call overload detection
From: lsmith@php.net (Lukas Smith)

Stanislav Malyshev wrote:
> MB>>  but that is a way of having __call that obviously doesn't fit the real
> MB>>world. In a real world application i only implement a few things with call
> MB>>and dislike having all the others implemented automatically also. And the
> MB>>i have to care about error generation while the engine could help me a lot
> MB>>so that my error messages look and behave just like they would if there
> MB>>is no __call. But that would indeed require some __exists() or
> MB>>__implemented() support().
> 
> Nothing prevents you from having __implemented or __whateveryoulike. 
> However, I don't see how engine could know beforehand if your __call would 
> succeed or not, so __implemented has no relation whatsoever to __call, 
> unless you make this relation in your code - and engine can't know you 
> did.

I think its obvious that you can implement things in userland or inside 
the engine. The main advantage of doing it inside the engine is that it 
then becomes the standard way of doing things, where as with userland 
its likely that several competing "standards" will emerge. Not because 
of real advantages, but just because of lack of a central standard.

However maybe its sufficient to just have an interface that defines the 
signature of such a "check if method is implemented by __call()" method 
along with a bit of text. That should imho be a sufficient approach. 
Without the need of adding yet another magic method to the engine itself.

regards,
Lukas