[VOTE] Locale-independent case conversion

I voted yes because I want to see this happen but I raised a point
in https://externals.io/message/116141#116259
https://externals.io/message/116141#116259 and didn't get an answer:

Despite their name, I never used natcase functions for natural
language
processing. I use them eg to sort lists of files in a directory,
to account
for numbers mainly. But that's not what I would call natural
language
processing. I'm not aware of anyone using them for that
actually. I'm
wondering if it's a good idea to postpone migrating them to an
hypothetical
future as to me, the whole reasoning of the RFC applies to them.

I wish the strnatcasecmp() and natcasesort() function, but also the
SORT_NATURAL flag were also covered by this RFC.
Is that possible? Would it make sense?

I'm not going to migrate those functions at this time. It's just a
project scope decision.

-- Tim Starling

btw why is this code not getting dotted capital i on 3v4l?
https://3v4l.org/D1WG1#v7.4.26
it gets ["res_hex"]=> string(2) "49"

<?php
setlocale(LC_ALL, "Turkish");
$str="i";
$res=strtoupper($str);
var_dump([
"str"=>$str,
"str_hex"=>bin2hex($str),
"res"=>$res,
"res_hex"=>bin2hex($res),
]);
?>

Le jeudi 25 novembre 2021, 06:05:37 CET Tim Starling a écrit :

Voting is now open for my RFC on locale-independent case conversion.

https://wiki.php.net/rfc/strtolower-ascii

Hello,

The RFC is missing information about alternatives:
Do all of these function have an mbstring version?
Are those locale dependant or have an option for it?

To reuse the example from the RFC, if I want to convert a UTF string to
uppercase using Turkish rules and get dotted capital I, what should I use?

Côme

--

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Hello,

The RFC is missing information about alternatives:
Do all of these function have an mbstring version?

The following functions have an mbstring version: strtolower,
strtoupper, stristr, stripos, strripos.

mb_convert_case() provides functionality equivalent to lcfirst,
ucfirst and ucwords.

There is no mbstring version of str_ireplace, that is
https://bugs.php.net/bug.php?id=75225

There is no mbstring equivalent for the array sorting functions with
SORT_FLAG_CASE, but there is Collator::asort() in intl.

Are those locale dependant or have an option for it?

The mbstring functions are locale-independent.

Unfortunately there do not seem to be PHP wrappers for the family of
case conversion functions in ICU's ustring.h. There is
IntlChar::tolower() and IntlChar::toupper(), but they provide
locale-independent case conversion, equvialent to mbstring. It's not
ideal to change the case of a string character by character, since
some languages have multi-character mappings. ICU calls this
context-sensitive case conversion.

Considering the lack of wide character support or context-sensitive
case conversion in the existing strtoupper/strtolower, I would
consider this missing functionality rather than functionality which I
am removing.

To reuse the example from the RFC, if I want to convert a UTF string to uppercase using Turkish rules and get dotted capital I, what should I use?

For case-insensitive comparison you can use Collator. But for display
you just have to do it yourself. For the Turkish Wikipedia and other
Turkic language websites we are currently using str_replace().

-- Tim Starling