PHP 8.1.6 Released – Comprehensive Bug‑Fix Update

PHP 8.1.6 has been released as a bug‑fix version, and the PHP project encourages all users of the 8.1 branch to upgrade. The release includes a series of fixes across many extensions and core components.

Core Fixed bug #8310 (registry settings no longer recognized). Fixed a potential race condition during resource ID allocation. Fixed bug #8133 (failure when preloading constants that contain enum arrays). Fixed the Haiku ZTS build.

Date Fixed bug #7752 (DateTimeZone::getTransitions() returned insufficient data). Fixed bug #8108 (timezone not working as expected). Fixed bug #81660 (DateTimeZone::getTransitions() returned invalid data). Fixed bug #8289 (exceptions from an iterator were not re‑thrown into a generator).

FFI Fixed bug #8433 (leak when assigning a function pointer to a struct in FFI).

FPM Fixed bug #76003 (FPM /status reported an incorrect active process count). Fixed bug #77023 (FPM could not terminate processes). Fixed the comment in the kqueue delete‑callback log message.

Hash Fixed bug #81714 (segmentation fault when serializing the final HashContext).

Iconv Fixed bug #8218 (ob_end_clean does not reset the Content‑Encoding header).

Intl Fixed bug #8364 (msgfmt_format $values may not support references).

MBString Adjusted the error count for invalid UTF‑8 text to match the WHATWG specification, reverting the behavior of PHP 8.0 and earlier.

MySQLi Fixed bug #8267 (MySQLi on Windows used an unsupported format specifier).

SPL Fixed bug #8366 (ArrayIterator could leak when __construct() is called). Fixed bug #8273 (SplFileObject::key() returned an incorrect value).

Streams Fixed the issue where php://temp switching to a temporary file did not retain the file position.

Zlib Fixed bug #8218 (ob_end_clean does not reset the Content‑Encoding header).