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To: Nicolai Scheer <nicolai.scheer@gmail.com>,
 PHP Internals <internals@lists.php.net>
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Date: Thu, 11 Apr 2019 15:41:26 +0200
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Subject: Re: default_charset and mb_internal_encoding
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 02.04.2019 at 11:42, Nicolai Scheer wrote:

> I'm currently in the process of migrating an old application from php 5.=
6
> to 7.2.
> In the process, I fiddled with the default_charset ini setting.
>
> The documentation states (c.f.
> https://www.php.net/manual/en/ini.core.php#ini.default-charset):
>
> "In PHP 5.6 onwards, "UTF-8" is the default value and [...] The value of
> default_charset
> will also be used to set the default character set for [...] and for
> mbstring functions
> if the mbstring.http_input mbstring.http_output mbstring.internal_encodi=
ng
> configuration option is unset."
>
> As such, I'd expect to be able to set default_charset to iso-8859-1 and
> mbstring to pick that same setting for its internal encoding (if the
> mentioned directives are unset, that is).
>
> This seems not to be the case:
>
> <?php
> ini_set( 'default_charset', 'iso-8859-1' );
> var_dump( ini_get("mbstring.internal_encoding") );
> var_dump( ini_get("mbstring.http_input") );
> var_dump( ini_get("mbstring.http_output") );
> echo mb_internal_encoding() . "\n";
> echo mb_strlen( "\xc3\xb6" ) . "\n";
> echo mb_strlen( "\xc3\xb6", '8bit' ) . "\n";
>
> This outputs (7.2.15 on a CentOS box):
> string(0) ""
> string(0) ""
> string(0) ""
> UTF-8
> 1
> 2
>
> The default_charset is set but mbstring settings are not, so I'd expect =
to
> get 2 as the character/byte count in both cases.
>
> If I throw a mb_internal_encoding("iso-8859-1") in the mix, both string
> lengths are equal.
>
> Since the mentioned mbstring directives are deprecated as of 5.6.0 - do =
I
> really need to use mb_internal_encoding() instead?
> Is the documentation wrong or am I just misinterpreting it? I thought th=
at
> default_charset should act as some kind of "master setting" in order not=
 to
> have to set all specific settings as well (e.g. iconv, mbstring).
>
> Usually we use UTF-8, so I did not come across this before...
>
> Any insight?

<https://3v4l.org/ZvQ67> confirms the reported behavior.  A quick look
at the code, too.  I suggest you file a ticket on <https://bugs.php.net/>.

Thanks,
Christoph M. Becker