Bug #77907 [Asn]: mb-functions do not respect default_encoding

Edit report at https://bugs.php.net/bug.php?id=77907&edit=1 ID: 77907 Updated by: nikic@php.net Reported by: n dot scheer at binserv dot de Summary: mb-functions do not respect default_encoding Status: Assigned Type: Bug Package: *Unicode Issues Operating System: CentOS 7.6.1810 PHP Version: 7.2.17 Assigned To: nikic Block user comment: N Private report: N New Comment: https://github.com/php/php-src/pull/4035 Probably 7.4 only, this is a non-trivial change. Previous Comments: ------------------------------------------------------------------------ [2019-04-16 14:13:20] nikic@php.net Working on this right now... ------------------------------------------------------------------------ [2019-04-16 14:06:54] n dot scheer at binserv dot de Description: ------------ 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_encoding 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). In the test script below the output of mb_strlen should be "2" in both cases, as iso-8859-1 is a single byte encoding. This is not the case, instead it seems that the two bytes are recognized as the utf-8 character "ö". If mb_internal_encoding is set explicitly, the mb-functions work as expected. But it should in fact not be needed to use mb_internal_encoding() nor the ini setting for it, because default_charset should be used as default. Test script: --------------- <?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")); var_dump(mb_internal_encoding()); var_dump(mb_strlen( "\xc3\xb6" )); var_dump(mb_strlen( "\xc3\xb6", '8bit' )); mb_internal_encoding('iso-8859-1'); var_dump(mb_internal_encoding()); var_dump(mb_strlen( "\xc3\xb6" )); var_dump(mb_strlen( "\xc3\xb6", '8bit' )); Expected result: ---------------- string(0) "" string(0) "" string(0) "" string(5) "UTF-8" int(1) int(2) string(10) "ISO-8859-1" int(2) int(2) Actual result: -------------- string(0) "" string(0) "" string(0) "" string(5) "UTF-8" int(2) int(2) string(10) "ISO-8859-1" int(2) int(2) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77907&edit=1