https://www.php.net/manual/en/migration83.other-changes.php#migration83.other-changes.functions.mbstring" rel="nofollow">https://www.php.net/manual/en/migration83.other-changes.php#migration83.other-changes.functions.mbstring Most locales only consider `ASCII` and `UTF-8` (see `mb_detect_order()`), and when a byte sequence invalid in both tested encodings (such as 0x91 for ‘ in Windows-1252) is encountered, one of them might now be chosen as the most fitting encoding. (This is done using the heuristics introduced in PHP 8.1: php/php-src@28b346b) Compare the output of the following script across PHP versions: <?php $result = hex2bin("91"); var_dump(mb_detect_encoding($result)); var_dump(mb_detect_encoding($result, 'auto', true)); var_dump(mb_convert_encoding($result, 'UTF-8', 'auto')); Let’s run the `mb_detect_encoding()` ourselves with `$strict` argument set to `true`, to ensure consistent behaviour across all PHP versions. This might potentially cause a regression is some cases. Not sure. Additionally, since we are now ensuring all encodings are valid, we can drop the warning capture mechanism. It does not work on PHP ≥ 8.0 anyway, since that raises a `ValueError` instead of a warning when an invalid encoding is provided. https://www.php.net/manual/en/function.mb-convert-encoding.php#refsect1-function.mb-convert-encoding-errors Also adjust the confusing string in tests. https://www.php.net/manual/en/function.mb-convert-encoding.php https://www.php.net/manual/en/function.mb-detect-encoding.php https://www.php.net/manual/en/function.mb-detect-order.php

Commits

Commits on Mar 15, 2025

mbstring: Make encoding detection stricter