Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:109572
To: Nikita Popov <nikita.ppv@gmail.com>,
 PHP internals <internals@lists.php.net>
References: <CAF+90c8MONp8Qh0E1qtegFb0QyZkqFv2OOirDzJds1LyOV4o5w@mail.gmail.com>
Autocrypt: addr=smalyshev@gmail.com; prefer-encrypt=mutual; keydata=
 xsJuBE9mqaARCACFSqcGmNunkjQQu3X+yXnTmFeEkvM4JXZTOBdR8aEevNGmmFEfyvjaDjWi
 9hcwp4E/lYtC+P7VsVjM1OSX9eq0jC/lGL0ZyRXek+mNy0n5H1NSuTpf9Y18LMqhc4G+RU+L
 cNiZ9K0DJuOOvNLPxW7OHZguxb3wdKPXNVa2jyRfJAKm2uaJJMT1mTmFT9a0Q8SKr+mUrrJk
 uG0H2o6SzrKt8Wwoint1eh67zVsJaJtQFchnEZnlawIcqP2yC4nLGR3MkubowxoEBYCZet18
 aHVVRbvpG2Qtob8Lu5xrsGbmXymTkHTdpvkfcJFADa8MzOL90zOxXwbGfbIZOlh5En8jAQCX
 lfnx2eQL3BSW/6XANa51dbWiEp1d1BAkpGKtZvlk0Qf+M9WAi+9aXMe3xP5krxtgnRNUf2WN
 6Zdy2MxL1RRJCFbytLhl0ronC49BsGYVGshdEH8xhBbiIOJKuVZ/DTl9bEm7P9c7CC7iJyVC
 khUAhouH6xzZQNLR+RU+QebYzXypVfl99Qk7EdMmr/WAZCHLuvanyqepC5EBsa3VnAfQemSN
 oBeGBKWWLiOsPjvS72+y1z4RUMAfXHn4l/sFMt8zt7/74AmJPwZquV41p4mPO12V4+xPyc6R
 sB84sfsk2QVivU8w8AkvGQeYjXoz7Iwao95+fWteVzZ36KRQvUckP8pGjHlDXnHxJ0HI1I/k
 OBZSjwRwUf0dd73y6erPhbLk+gf+NdI3H9KGJBzG5/rVyWKwUeQ9d5ud4jTJRkQGvAP5pg76
 vEa9dogbpe4W5Z+0BfbiJSnQmQWSHiZddj/t33ptbup44Ck6ZTgdlmFYMLF1hR47PIZTDKER
 EuKYGci/vq8snZvEJP9YCw/TtiHcMdrMKcY/+Lp8lQO0GHLPB9glVhnC0db6l1Xpg1CMI8/R
 ozBMcij30EgATggC/y2zbiqAFoS9FN9nXPbe4phStqABEyeZ+nXudt7PUYTjVgcrqo8bHZCi
 sBobWC7OnKyUzxVxzUeuPkIfmZuzkLaMw2McQdvwwsNvQ0DzaLP30c1Xsm/7EIYJcOWpzlVJ
 5QrdmE0/Bc0yU3RhbmlzbGF2IE1hbHlzaGV2IChQSFAga2V5KSA8c21hbHlzaGV2QGdtYWls
 LmNvbT7CegQTEQgAIgUCT2aqtAIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQL3lW
 vF2gS12XMwD9HuRIolSwIK77u8EY461y2u6sbX36n5/uo/LDQuxoi3sA/0MvpnvzOhv9Iufv
 vsZEj3E7i3h+iD5648YMwfTFCij+zsFNBE9mqaAQCADfZPMpjZkkGZj3BY/7ApoLq4mwqzbh
 +CpLXwNn20tFNvSXfb8RdeXvVEb7Scx+W9qYpiaun2iXJgCVH8fgpZpR856ulT1q6uCG++CX
 ubEvip/eJkZl93/84h04KQJwsgOrAh0Om3OePRn8Pr+++0LNS0EL8uX/YHeTOGOnnmTqYTey
 SBVFdov6L4mepddfjekicKQqhL7mZh/xuq29JijT0uNNX8v4vDWQDu5dlAcdd+uB3gcXMD/P
 ginD11zp+6wtrWCm/+yBqpvDwXQX5PGUnwvbRfl7Ay3MmwmoXiecZMg0dwTSc7e0lhB4HGRH
 ZdBMJB4rHUVGdzqujK/ctOvrAAMFB/0Utb76Qe6sCMlHxVAmeE/fbo7Pi05btZ/x01r67dHf
 aMSP0riCKJ7M0OW+jAXtu9+z/BVnYisW67WWfxl2cS5tZDgiHgJARXWUOO72+sScHP8KQmTl
 1z16gyKbwY3SmyBkwcpOL35nhUWNLy93syPoY6sZUTikr2bZYukHDQ33XBPs4e6MbWKfsa9q
 aVmnlOF3k5UqChjutfHaEa4Q7VP4wBIpphHBi9MI16oJIzzBPbGl2uoedjwiZ6QeQZnSuOVY
 ZxU2d3lRA8PrtfFN1VSlpEm/VcAvtieHUYWHN0wOu+cp3Slr5XJVNjTjJhl28SlinMME54mK
 AGf2Ldr/dRwXwmEEGBEIAAkFAk9mqaACGwwACgkQL3lWvF2gS126EQD/VVd3FgjLKglClRQP
 zdfU847tqDK4zJjbmRv5vLLwoE0A+wbrQs7jVGU3NrS0AIl5vUmewpp2BKzSkepy23nWmejw
Message-ID: <663d3596-824c-f98e-2ddd-6d912f6a94d8@gmail.com>
Date: Wed, 8 Apr 2020 22:21:41 -0700
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0)
 Gecko/20100101 Thunderbird/68.6.0
MIME-Version: 1.0
In-Reply-To: <CAF+90c8MONp8Qh0E1qtegFb0QyZkqFv2OOirDzJds1LyOV4o5w@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] Resurrecting named parameters
From: smalyshev@gmail.com (Stanislav Malyshev)

Hi!

> 2. Throw a notice if a parameter name is changed. While LSP violations are
> normally fatal errors (in PHP 8), we could use a lower-severity diagnostic
> for this case, that allows code to still run, but makes developers aware of
> the problem. (It should be noted that automatic fixup of parameter names
> using tooling should be fairly easy to implement.)

I think we should have a notice for now, and eventually when people are
used to it upgrade it to an error.

> The larger problem is that internal functions don't have a well-defined
> concept of parameter default value. Parameter defaults are implicit in C
> code, and sometimes based on argument count checks. When named parameters
> are involved, one generally cannot assume that if a later (optional)
> parameter is passed, all earlier (optional) parameters are passed as well.

IIRC I did some work on that when making the skipped parameter RFC, but
I think we have no choice but to make all internal functions we control
have proper default implementation. Older modules may be lagging though,
so another option would be to add some kind of flag to internal
functions that would block named parameters if not set, and make
extension writers fix their functions and then set this flag explicitly.
Of course we'll set this flag for all functions in core, after fixing
those of them that need fixing. Maybe not a flag but using different
macro/API function, etc. - the idea is that some explicit change would
be needed. Yes, that means additional work...

More complicated but milder option would be to only check the flag if
there's a "gap" in parameters - but this may have higher learning curve
as extension writers wouldn't even know their extension needs work until
someone skips a parameter.
-- 
Stas Malyshev
smalyshev@gmail.com