Core:
    Fixed bug #75776 (Flushing streams with compression filter is broken).
    Fixed bug #80811 (Function exec without $output but with $restult_code parameter crashes).
    Fixed bug #80814 (threaded mod_php won't load on FreeBSD: No space available for static Thread Local Storage).
    Changed PowerPC CPU registers used by Zend VM to work around GCC bug. Old registers (r28/r29) might be clobbered by _restgpr routine used for return from C function compiled with -Os.
Dba:
    Fixed bug #80817 (dba_popen() may cause segfault during RSHUTDOWN).
DOM:
    Fixed bug #66783 (UAF when appending DOMDocument to element).
FFI:
    Fixed bug #80847 (CData structs with fields of type struct can't be passed as C function argument).
FPM:
    Fixed bug #80024 (Duplication of info about inherited socket after pool removing).
FTP:
    Fixed bug #80880 (SSL_read on shutdown, ftp/proc_open).
IMAP:
    Fixed bug #80800 (imap_open() fails when the flags parameter includes CL_EXPUNGE).
    Fixed bug #80710 (imap_mail_compose() header injection).
Intl:
    Fixed bug #80763 (msgfmt_format() does not accept DateTime references).
LibXML:
    Fixed bug #73533 (Invalid memory access in php_libxml_xmlCheckUTF8).
    Fixed bug #51903 (simplexml_load_file() doesn't use HTTP headers).
MySQLnd:
    Fixed bug #80837 (Calling stmt_store_result after fetch doesn't throw an error).
Opcache:
    Fixed bug #80839 (PHP problem with JIT).
    Fixed bug #80861 (erronous array key overflow in 2D array with JIT).
    Fixed bug #80786 (PHP crash using JIT).
    Fixed bug #80782 (DASM_S_RANGE_VREG on PHP_INT_MIN-1).
Pcntl:
    Fixed bug #79812 (Potential integer overflow in pcntl_exec()).
PCRE:
    Fixed bug #80866 (preg_split ignores limit flag when pattern with \K has 0-width fullstring match).
PDO_ODBC:
    Fixed bug #80783 (PDO ODBC truncates BLOB records at every 256th byte).
PDO_pgsql:
    Fixed bug #80892 (PDO::PARAM_INT is treated the same as PDO::PARAM_STR).
Session:
    Fixed bug #80889 (Cannot set save handler when save_handler is invalid).
    Fixed bug #80774 (session_name() problem with backslash).
SOAP:
    Fixed bug #69668 (SOAP special XML characters in namespace URIs not encoded).
Standard:
    Fixed bug #80915 (Taking a reference to $_SERVER hides its values from phpinfo()).
    Fixed bug #80914 ('getdir' accidentally defined as an alias of 'dir').
    Fixed bug #80771 (phpinfo(INFO_CREDITS) displays nothing in CLI).
    Fixed bug #78719 (http wrapper silently ignores long Location headers).
    Fixed bug #80838 (HTTP wrapper waits for HTTP 1 response after HTTP 101).
Zip:
    Fixed bug #80825 (ZipArchive::isCompressionMethodSupported does not exist).