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Date: Sat, 22 Jun 2019 22:43:43 +0200
Message-ID: <CAF+90c-52xiX9h=YHYdpQOO7oBS_6Dk2aP0bGuWU=p0sCdMa=A@mail.gmail.com>
To: Bruce Weirdan <weirdan@gmail.com>
Cc: will@wkhudgins.info, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000008f0fa7058befa30b"
Subject: Re: [PHP-DEV] [RFC] Desire to move RFC add_str_begin_and_end_functions
 to a vote
From: nikita.ppv@gmail.com (Nikita Popov)

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On Sat, Jun 22, 2019 at 10:27 PM Bruce Weirdan <weirdan@gmail.com> wrote:

> On Sat, Jun 22, 2019 at 6:32 PM Nikita Popov <nikita.ppv@gmail.com> wrote:
> >
> > The normal str_starts_with() function is perfectly  safe to use on UTF-8
> strings,
>
> Only if you assume strings to be normalized to the same form. Checking if
> NFC
> string starts with NFD substring by checking them bit by bit is going
> to yield false negatives [1]
>
> [1] https://3v4l.org/4HgUL
>

That's correct, but not really relevant in the context of the discussion,
as mbstring does not perform Unicode normalization, so mb_* functions
wouldn't change anything about this. (Not that basic string operations
should be performing implicit Unicode normalization...)

Nikita

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