Bug #81349 [NEW]: mb_detect_encoding misdetcts ASCII in some cases

From: phofstetter at sensational dot ch Operating system: macOS PHP version: 8.1.0beta2 Package: mbstring related Bug Type: Bug Bug description:mb_detect_encoding misdetcts ASCII in some cases Description: ------------ mb_detect_encoding() seems to have changed quite a bit between PHP 8.0 and 8.1 and mostly for the better, TBH. However, here's a test case where it misdetects a string as being ASCII when it absolutely cannot be because byte 0 is outside of the 7bit range of ASCII. If byte 1 is any non-letter character aside of space, the misdetection will happen. If it's any letter or space, it's fine. While in <= PHP 8.0, the function had it's quirks, it would never detect a string with a character with its high-bit set as ASCII. Test script: --------------- <?php echo(mb_detect_encoding("\xe4,a", ['ASCII', 'UTF-8', 'ISO-8859-1'])."\n"); echo(mb_detect_encoding("\xe4 a", ['ASCII', 'UTF-8', 'ISO-8859-1'])."\n"); Expected result: ---------------- ISO-8859-1 ISO-8859-1 Actual result: -------------- ASCII ISO-8859-1 -- Edit bug report at https://bugs.php.net/bug.php?id=81349&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81349&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81349&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81349&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81349&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81349&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81349&r=support Expected behavior: https://bugs.php.net/fix.php?id=81349&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81349&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81349&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81349&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81349&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81349&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81349&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81349&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81349&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81349&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81349&r=mysqlcfg