Setting “mbstring.detect_order” in phpunit.xml and using function "mb-detect-order" doesn't work

[athaden]

Q	A
PHPUnit version	11.5.44
PHP version	8.4.7
Installation Method	Composer

Summary

I want to check encoding of values. So I use function "mb_detect_encoding" without no optional parameters. So the function will use the values of "mbstring.detect_order" via function "mb_detect_order" and "mbstring.strict_detection" from php.ini. However, If i set the values via phpunit.xml, However, when I set the values via phpunit.xml, the value from “mbstring.detect_order” is adopted and can be read via ini_get, but the “mb_detect_order” function still returns the wrong result and so the result of "mb_detect_encoding" isn't correct.

How to reproduce

Setting values in phpunit.xml:

<phpunit>
  <php>
    <ini name="mbstring.detect_order" value="ISO-8859-1, UTF-8"/>
    <ini name="mbstring.strict_detection" value="true"/>
  <php>
</phpunit>

Method ini_get('mbstring.detect_order') returns "ISO-8859-1, UTF-8".
Method mb_detect_order() returns php default (an array with values "ASCII" and "UTF-8").
Method mb_detect_encoding(mb_convert_encoding('ÄäÖöÜüß', 'ISO-8859-1', 'UTF-8')) returns "UTF-8".

When using php.ini, the behavior is as follows:

mbstring.detect_order = ISO-8859-1, UTF-8
mbstring.strict_detection = true

Method ini_get('mbstring.detect_order') returns "ISO-8859-1, UTF-8".
Method mb_detect_order() returns also an array with values "ISO-8859-1" and "UTF-8".
Method mb_detect_encoding(mb_convert_encoding('ÄäÖöÜüß', 'ISO-8859-1', 'UTF-8')) returns "ISO-8859-1".

[sebastianbergmann]

PHPUnit uses PHP's ini_set() function to set settings for the PHP runtime configured using the <ini> element in PHPUnit's XML configuration file. Not all PHP runtime configuration settings can be set using the ini_set() function, though. Maybe this is the case for the configuration settings you configure?

[ToBee94]

ini_set('mbstring.detect_order') doesn't update the current_detect_order_list of the mbstring module.

current_detect_order_list is only set by the function mb_detect_order himself or at php_mb_populate_current_detect_order_list which is called at the loading of mbstring module (with the ini values from the system runtime).

[sebastianbergmann]

Thank you, @ToBee94, so this is not a PHPUnit issue then.