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Date: Thu, 6 Nov 2014 11:42:42 +0400
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To: PHP internals <internals@lists.php.net>
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Subject: Re: Allow arbitrary expressions when using instanceof operator
From: drgomesp@gmail.com (Daniel Ribeiro)

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Oh, and thanks to @SaraMG for pointing me to the write direction on writing
an e-mail to the internals :)


Daniel Ribeiro
http://danielribeiro.org

On Thu, Nov 6, 2014 at 11:41 AM, Daniel Ribeiro <drgomesp@gmail.com> wrote:

> Good morning, internals!
>
> I would like to present to you an idea that I have for a syntax
> improvement for PHP.
>
> The basic idea is to allow arbitrary expressions when using the instanceof
> operator. Currently, the second operand can only be a constant reference or
> a string:
>
> $foo instanceof stdClass;
>
> What I want to implement is the ability to allow arbitrary expressions on
> the second operand, so instead of having to write something like this:
>
> $className = 'stdClass';
> $foo instanceof $className;
>
> We could write something like this:
>
> $foo instanceof ($bar->getClassName());
>
> I've been working with Nikita Nefedov on this improvement, and we managed
> to reach a very simple way to implement it, and it looks pretty good so far.
>
> Currently, I don't have a VCS account, and eventually I want to open a
> formal RFC for this, but I first wanted to discuss this with you guys to
> see the impressions on it and suggestions as well.
>
> Regarding BC breaks, there would be none from what I can see so far -
> hopefully someone more experienced will be able to point my any.
>
> So, what do you think?
>
> Cheers!
>
> Daniel Ribeiro
> http://danielribeiro.org
>

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