PHP-8.4.0RC2 has several bug fixes and improvements. BcMath has seen performance improvements, including bcpow() and ext/bcmath. XML serializer errors have been fixed, and MBString has been updated to Unicode 16.0. Opcache has fixed issues with dasm_x86.h and opcache_jit_blacklist(). PHPDBG has fixed issues with ifuncs, PCRE has been fixed, and PDO_PGSQL has fixed issues with PQclosePrepared. Reflection has added missing ReflectionProperty::hasHook[s]() methods, SimpleXML has fixed issues with spl_fixedarray. SOAP has fixed bugs with stream context HTTP headers in array form, and TSRM prevents the closing of unrelated handles. Windows has been fixed, and Zip has added ZipArchive::ER_TRUNCATED_ZIP in libzip 1.11.

php-8.4.0RC2

- BcMath:
. bcpow() performance improvement. (Jorg Sowa)
. ext/bcmath: Check for scale overflow. (SakiTakamachi)
. [RFC] ext/bcmath: Added bcdivmod. (SakiTakamachi)
. Fix GH-15968 (Avoid converting objects to strings in operator calculations).
(SakiTakamachi)

- Curl:
. Added CURLOPT_DEBUGFUNCTION as a Curl option. (Ayesh Karunaratne)

- Debugging:
. Fixed bug GH-15923 (GDB: Python Exception <class 'TypeError'>:
exceptions must derive from BaseException). (nielsdos)

- DOM:
. Fix XML serializer errata: xmlns="" serialization should be allowed.
(nielsdos)
. Fixed bug GH-15910 (Assertion failure in ext/dom/element.c). (nielsdos)
. Fix unsetting DOM properties. (nielsdos)

- MBString:
. Fixed bug GH-15824 (mb_detect_encoding(): Argument $encodings contains
invalid encoding "UTF8"). (Yuya Hamada)
. Updated Unicode data tables to Unicode 16.0. (Ayesh Karunaratne)

- Opcache:
. Fixed bug GH-15657 (Segmentation fault in dasm_x86.h). (nielsdos)
. Added opcache_jit_blacklist() function. (Bob)

- PHPDBG:
. Fixed bug GH-15901 (phpdbg: Assertion failure on i funcs). (cmb)

- PCRE:
. Fix UAF issues with PCRE after request shutdown. (nielsdos)

- PDO_PGSQL:
. Fixed GH-15986 (Double-free due to Pdo\Pgsql::setNoticeCallback()). (cmb,
nielsdos)
. Fixed GH-12940 (Using PQclosePrepared when available instead of
the DEALLOCATE command to free statements resources). (David Carlier)

- Reflection:
. Add missing ReflectionProperty::hasHook[s]() methods. (ilutov)
. Add missing ReflectionProperty::isFinal() method. (ilutov)

- SimpleXML:
. Fixed bug GH-15837 (Segmentation fault in ext/simplexml/simplexml.c).
(nielsdos)

- SOAP:
. Fixed bug #73182 (PHP SOAPClient does not support stream context HTTP
headers in array form). (nielsdos)
. Fixed bug #62900 (Wrong namespace on xsd import error message). (nielsdos)
. Fixed bug GH-15711 (SoapClient can't convert BackedEnum to scalar value).
(nielsdos)

- SPL:
. Fixed bug GH-15918 (Assertion failure in ext/spl/spl_fixedarray.c).
(nielsdos)

- Standard:
. Add support for backed enums in http_build_query(). (ilutov)
. Fixed bug GH-15982 (Assertion failure with array_find when references are
involved). (nielsdos)

- Streams:
. Fixed bugs GH-15908 and GH-15026 (leak / assertion failure in streams.c).
(nielsdos)
. Fixed bug GH-15980 (Signed integer overflow in main/streams/streams.c).
(cmb)

- TSRM:
. Prevent closing of unrelated handles. (cmb)

- Windows:
. Fixed minimal Windows version. (cmb)

- Zip:
. Added ZipArchive::ER_TRUNCATED_ZIP added in libzip 1.11. (Remi)

Release php-8.4.0RC2 · php/php-src