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Date: Sun, 24 Jun 2018 23:03:59 -0700
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Subject: Re: [PHP-DEV] [RFC] Deprecate and remove case-insensitive constants
From: smalyshev@gmail.com (Stanislav Malyshev)

Hi!

> https://wiki.php.net/rfc/case_insensitive_constant_deprecation
> 
> This was already discussed some time ago on the list, though that
> discussion degenerated into unfortunate directions. I'd very much
> appreciate if we could keep discussions on making PHP fully case-sensitive
> or fully case-insensitive outside of this thread. (Feel free to open a new
> one though.)
> 
> The main point I'd like to have feedback on is the handling of true, false
> and null, as I'm not sure what the best approach regarding that is.

I think the must is to keep true/false/null working in all cases. I
don't think messing with this would be acceptable due to amount of code
it'd break.

Now, I think breaking constant("null") could be acceptable in PHP 8, if
necessary, as use case for this seems to be very narrow. However, I
wonder if we can't just special-case those three in constant() function
and write "for historical raisins, this is weird" and be done with it.
Not ideal, but practically might be good enough.

Converting them to keywords should be fine - am I wrong to think the
impact would not be that big with new parser, as we now have less places
where keywords are banned?

As for the rest, I think we should get rid of case-insensitive constants
(including defined by extensions) and all the weirdness that follows.
Deprecating them would be a good first step.

-- 
Stas Malyshev
smalyshev@gmail.com