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Date: Sat, 18 Aug 2012 15:19:41 +0200
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To: Derick Rethans <derick@php.net>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC] Generators
From: nikita.ppv@gmail.com (Nikita Popov)

On Sat, Aug 18, 2012 at 2:21 PM, Derick Rethans <derick@php.net> wrote:
> I've some comments how that I've read the RFC:
>
>> Recognition of generator functions
>>
>> 1. Any function which contains a yield statement is automatically a
>> generator function.
>>
>> 2. The initial implementation required that generator functions are
>> marked with an asterix modifier (function*). This method has the
>> advantage that generators are more explicit and also allows for
>> yield-less coroutines.
>>
>> The automatic detection was chosen over the asterix modifier for the
>> following reasons:
>
> I am against this. This is even more magic in PHP. Is it really that
> difficult to have to mark the function with a different keyword, such as
> "generator":

There was already a rather long discussion on this topic. Most of it
is noise, but I filtered out a few mails from Sara and Rasmus as they
probably are of most interest:

http://markmail.org/message/xzhdhbjozb4yrhh3
http://markmail.org/message/ryhygtimpd7q2nok
http://markmail.org/message/32fklwqykpk56iph
http://markmail.org/message/w2kbh7psplnmctcr

>> yield: Yields the value null with an auto-incrementing integer key.
>
> What is the usecase for this?

Use case is `$data = yield;`. In that case you don't care about what
you yield (so just the default value and key are yielded), you are
only interested in what you get sent back.

Nikita