UPGRADING

PHP 8.5 UPGRADE NOTES

1. Backward Incompatible Changes
2. New Features
3. Changes in SAPI modules
4. Deprecated Functionality
5. Changed Functions
6. New Functions
7. New Classes and Interfaces
8. Removed Extensions and SAPIs
9. Other Changes to Extensions
10. New Global Constants
11. Changes to INI File Handling
12. Windows Support
13. Other Changes
14. Performance Improvements

========================================
1. Backward Incompatible Changes
========================================

- BZ2:
  . bzcompress() now throws a ValueError when $block_size is not between
    1 and 9.
  . bzcompress() now throws a ValueError when $work_factor is not between
    0 and 250.

- Core:
  . It is no longer possible to use "array" and "callable" as class alias names
    in class_alias().
  . Loosely comparing uncomparable objects (e.g. enums, \CurlHandle and other
    internal classes) to booleans was previously inconsistent. If compared to a
    boolean literal $object == true, it would behave the same way as (bool)
    $object. If compared to a statically unknown value $object == $true, it
    would always return false. This behavior was consolidated to always follow
    the behavior of (bool) $object.
  . The return value of gc_collect_cycles() no longer includes strings and
    resources that were indirectly collected through cycles.
  . It is now allowed to substitute static with self or the concrete class name
    in final subclasses.
  . The tick handlers are now deactivated after all shutdown functions, destructors
    have run and the output handlers have been cleaned up.
    This is a consequence of fixing GH-18033.
  . Traits are now bound before the parent class. This is a subtle behavioral
    change, but should closer match user expectations, demonstrated by GH-15753
    and GH-16198.

- Intl:
  . The extension now requires at least ICU 57.1.

- LDAP:
  . ldap_get_option() and ldap_set_option() now throw a ValueError when
    passing an invalid option.

- MySQLi:
  . Calling the mysqli constructor on an already-constructed object
    is now no longer possible and throws an Error.

- PCNTL:
  . pcntl_exec() now throws ValueErrors when entries of the $args parameter
    contain null bytes.
  . pcntl_exec() now throws ValueErrors when entries or keys of the
    $env_vars parameter contain null bytes.

- PCRE:
  . The extension is compiled without semi-deprecated
    PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK compile option.
    https://github.com/PCRE2Project/pcre2/issues/736#issuecomment-2754024651

- PDO:
  . The constructor arguments set in conjunction with PDO::FETCH_CLASS now
    follow the usual CUFA (call_user_func_array) semantics.
    This means string keys will act like a named argument.
    Moreover, automatic wrapping for by-value arguments passed to a by-ref
    parameter has been removed, and the usual E_WARNING about this is now
    emitted.
    To pass a variable by-ref to a constructor argument use the general
    array value reference assignment: $ctor_args = [&$valByRef]
  . Attempting to modify a PDOStatement during a call to PDO::fetch(),
    PDO::fetchObject(), PDO::fetchAll() will now throw an Error.
  . The value of the constants PDO::FETCH_GROUP, PDO::FETCH_UNIQUE,
    PDO::FETCH_CLASSTYPE, PDO::FETCH_PROPS_LATE, and PDO::FETCH_SERIALIZE
    has changed.
  . A ValueError is now thrown if PDO::FETCH_PROPS_LATE is used with a fetch
    mode different than PDO::FETCH_CLASS, consistent with other fetch flags.
  . A ValueError is now thrown if PDO::FETCH_INTO is used as a fetch mode in
    PDO::fetchAll(), similar to PDO::FETCH_LAZY.

- PDO_FIREBIRD:
  . A ValueError is now thrown when trying to set a cursor name that is too
    long on a PDOStatement resulting from the Firebird driver.

- SimpleXML:
  - Passing an XPath expression that returns something other than a node set
    to SimpleXMLElement::xpath() will now emit a warning and return false,
    instead of silently failing and returning an empty array.

- SPL:
  . ArrayObject no longer accepts enums, as modifying the $name or $value
    properties can break engine assumptions.
  . SplFileObject::fwrite's parameter $length is now nullable. The default
    value changed from 0 to null.

========================================
2. New Features
========================================

- Core:
  . Closure is now a proper subtype of callable
  . Added support for Closures and first class callables in constant
    expressions.
    RFC: https://wiki.php.net/rfc/closures_in_const_expr
    RFC: https://wiki.php.net/rfc/fcc_in_const_expr
  . Fatal Errors (such as an exceeded maximum execution time) now include a
    backtrace.
    RFC: https://wiki.php.net/rfc/error_backtraces_v2
  . Added the #[\NoDiscard] attribute to indicate that a function's return
    value is important and should be consumed.
    RFC: https://wiki.php.net/rfc/marking_return_value_as_important
  . Added the (void) cast to indicate that not using a value is intentional.
    The (void) cast has no effect on the program's execution by itself, but
    it can be used to suppress warnings emitted by #[\NoDiscard] and possibly
    also diagnostics emitted by external IDEs or static analysis tools.
    RFC: https://wiki.php.net/rfc/marking_return_value_as_important
  . Added asymmetric visibility support for static properties.
    RFC: https://wiki.php.net/rfc/static-aviz

- Curl:
  . Added support for share handles that are persisted across multiple PHP
    requests, safely allowing for more effective connection reuse.
    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement
  . Added support for CURLINFO_USED_PROXY (libcurl >= 8.7.0),
    CURLINFO_HTTPAUTH_USED, and CURLINFO_PROXYAUTH_USED
    (libcurl >= 8.12.0) to the curl_getinfo() function.
    When curl_getinfo() returns an array, the same information
    is available as "used_proxy", "httpauth_used", and "proxyauth_used"
    keys.
    CURLINFO_USED_PROXY gets zero set if no proxy was used in the
    previous transfer or a non-zero value if a proxy was used.
    CURLINFO_HTTPAUTH_USED and CURLINFO_PROXYAUTH_USED get bitmasks
    indicating the http and proxy authentication methods that were
    used in the previous request. See CURLAUTH_* constants for
    possible values.

- DOM:
  . Added Dom\Element::$outerHTML.

- XSL:
  . The $namespace argument of XSLTProcessor::getParameter(),
    XSLTProcessor::setParameter() and XSLTProcessor::removeParameter()
    now actually works instead of being treated as empty.
    This only works if the $name argument does not use Clark notation
    and is not a QName because in those cases the namespace is taken
    from the namespace href or prefix respectively.

- Zlib:
  . flock() is now supported on zlib streams. Previously, this always
    failed to perform any locking action.

========================================
3. Changes in SAPI modules
========================================

- CLI:
  . Trying to set a process title that is too long with cli_set_process_title()
    will now fail instead of silently truncating the given title.
  . Added a new --ini=diff option to print INI settings changed from the builtin
    default.

- FPM:
  . FPM with httpd ProxyPass decodes the full scirpt path script path. Added
    fastcgi.script_path_encoded INI setting to prevent this new behevior.

========================================
4. Deprecated Functionality
========================================

- Hash:
  The MHASH_* constants have been deprecated.  These have been overlooked
  when the mhash*() function family has been deprecated per
  https://wiki.php.net/rfc/deprecations_php_8_1#mhash_function_family

========================================
5. Changed Functions
========================================

- Intl:
  . IntlDateFormatter::setTimeZone()/datefmt_set_timezone()
    throws an IntlException on uninitialised classes/clone failures.

  . grapheme_extract() properly assigns $next value when skipping over
    invalid starting bytes. Previously there were cases where it would
    point to the start of the grapheme boundary instead of the end.

- PCNTL:
  . pcntl_exec() now has a formal return type of false.

- PDO_PGSQL:
  . PDO::pgsqlCopyFromArray also supports inputs as Iterable.
  . Pdo\Pgsql::setAttribute and Pdo\Pgsql::prepare supports
    PDO::ATTR_PREFETCH sets to 0 which set to lazy fetch mode.
    In this mode, statements cannot be run parallely.

- PGSQL:
  . pg_copy_from also supports inputs as Iterable.
  . pg_connect checks if the connection_string argument contains
    any null byte.
  . pg_close_stmt checks if the statement_name argument contains
    any null byte.

- POSIX:
  . posix_ttyname sets last_error to EBADF when encountering
    an invalid file descriptor.
  . posix_isatty raises an E_WARNING message when encountering
    an invalid file descriptor.
  . posix_fpathconf checks invalid file descriptors and sets
    last_error to EBADF and raises an E_WARNING message.

- Reflection:
  . The output of ReflectionClass::toString() for enums has changed to
    better indicate that the class is an enum, and that the enum cases
    are enum cases rather than normal class constants.

- Session:
  . session_start is stricter in regard of the option argument.
    It throws a ValueError if the whole is not a hashmap or
    a TypeError if read_on_close value is not a valid type
    compatible with int.

- SNMP:
  . snmpget, snmpset, snmp_get2, snmp_set2, snmp_get3, snmp_set3
    and SNMP::__construct() throw a ValueError when the hostname
    is too large, contains any null byte or if the port is given
    when negative or greater than 65535, timeout and retries values
    are lower than -1 or too large.

- Sockets:
  . socket_create_listen, socket_bind and socket_sendto throw a
    ValueError if the port is lower than 0 or greater than 65535,
    also if any of the hints array entry is indexes numerically.
  . socket_addrinfo_lookup throws a TypeError if any of the hints
    values cannot be cast to a int and can throw a ValueError if
    any of these values overflow.
  . socket_set_option with MCAST_LEAVE_GROUP/MCAST_LEAVE_SOURCE_GROUP
    options will throw an exception if the value isn't a valid object
    or array.
  . socket_create/socket_bind can create AF_PACKET family sockets.
  . socket_getsockname gets the interface index and its string
    representation with AF_PACKET socket.

- Zlib:
  . The "use_include_path" argument for the
    gzfile, gzopen and readgzfile functions had been changed
    from int to boolean.
  . gzfile, gzopen and readgzfile functions now respect the default
    stream context.

========================================
6. New Functions
========================================

- Core:
  . get_error_handler() allows retrieving the current user-defined error handler
    function.
    RFC: https://wiki.php.net/rfc/get-error-exception-handler
  . get_exception_handler() allows retrieving the current user-defined exception
    handler function.
    RFC: https://wiki.php.net/rfc/get-error-exception-handler

- Curl:
  . curl_multi_get_handles() allows retrieving all CurlHandles current
    attached to a CurlMultiHandle. This includes both handles added using
    curl_multi_add_handle() and handles accepted by CURLMOPT_PUSHFUNCTION.
  . curl_share_init_persistent() allows creating a share handle that is
    persisted across multiple PHP requests.
    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement

- DOM:
  . Added Dom\Element::insertAdjacentHTML().

- Enchant:
  . Added enchant_dict_remove_from_session() to remove a word added to the
    spellcheck session via enchant_dict_add_to_session().
  . Added enchant_dict_remove() to put a word on the exclusion list and
    remove it from the session dictionary.

- PGSQL:
  . pg_close_stmt offers an alternative way to close a prepared
    statement from the DEALLOCATE sql command in that we can reuse
    its name afterwards.
  . pg_service returns the ongoing service name of the connection.

- Reflection:
  . ReflectionConstant::getFileName() was introduced.
  . ReflectionConstant::getExtension() and
    ReflectionConstant::getExtensionName() were introduced.

========================================
7. New Classes and Interfaces
========================================

- Curl:
  . CurlSharePersistentHandle representing a share handle that is persisted
    across multiple PHP requests.
    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement

========================================
8. Removed Extensions and SAPIs
========================================

========================================
9. Other Changes to Extensions
========================================

- Fileinfo:
  . Upgraded to file 5.46.

- PCRE:
  . Upgraded to pcre2lib from 10.44 to 10.45.

- Readline:
  . The return types of readline_add_history(), readline_clear_history(), and
    readline_callback_handler_install() have been changed to true, rather
    than bool.

========================================
10. New Global Constants
========================================

- Core:
  . PHP_BUILD_DATE.

- Curl:
  . CURLINFO_USED_PROXY.
  . CURLINFO_HTTPAUTH_USED.
  . CURLINFO_PROXYAUTH_USED.

- Intl:
  . DECIMAL_COMPACT_SHORT.
  . DECIMAL_COMPACT_LONG.

- POSIX:
  . POSIX_SC_OPEN_MAX.

- Sockets:
  . IPPROTO_ICMP/IPPROTO_ICMPV6.
  . TCP_FUNCTION_BLK (FreeBSD only).
  . TCP_FUNCTION_ALIAS (FreeBSD only).
  . TCP_REUSPORT_LB_NUMA (FreeBSD only).
  . TCP_REUSPORT_LB_NUMA_NODOM (FreeBSD only).
  . TCP_REUSPORT_LB_NUMA_CURDOM (FreeBSD only).
  . TCP_BBR_ALGORITHM (FreeBSD only).
  . AF_PACKET (Linux only).
  . IP_BINDANY (FreeBSD/NetBSD/OpenBSD only).
  . SO_BUSY_POLL (Linux only).

========================================
11. Changes to INI File Handling
========================================

- Core:
  . Added fatal_error_backtraces to control whether fatal errors should include
    a backtrace.
    RFC: https://wiki.php.net/rfc/error_backtraces_v2

- Opcache:
  . Added opcache.file_cache_read_only to support a read-only
    opcache.file_cache directory, for use with read-only file systems
    (e.g. read-only Docker containers).
    Best used with opcache.validate_timestamps=0,
    opcache.enable_file_override=1,
    and opcache.file_cache_consistency_checks=0.
    Note: A cache generated with a different build of PHP, a different file
    path, or different settings (including which extensions are loaded), may be
    ignored.

========================================
12. Windows Support
========================================

* The configuration variables PHP_VERSION, PHP_MINOR_VERSION, and
  PHP_RELEASE_VERSION are now always numbers.  Previously, they have been
  strings for buildconf builds.

* phpize builds now reflect the source tree in the build dir (like that already
  worked for in-tree builds); some extension builds (especially when using
  Makefile.frag.w32) may need adjustments.

* --enable-sanitzer is now supported for MSVC builds.  This enables ASan and
  debug assertions, and is supported as of MSVC 16.10 and Windows 10.

* The --with-uncritical-warn-choke configuration option for clang builds is
  no longer supported.  Select warnings to suppress via CFLAGS instead.

* COM:
  . The extension is now build shared by default; previously it defaulted to a
    static extension, although the official Windows binaries built a shared
    extension.

* FFI:
  . It is no longer necessary to specify the library when using FFI::cdef()
    and FFI::load(). However, this convenience feature should not be used in
    production.

* Streams:
  . If only pipe streams are contained in the $read array, and the $write and
    $except arrays are empty, stream_select() now behaves similar to POSIX
    systems, i.e. the function only returns if at least one pipe is ready to be
    read, or after the timeout expires.  Previously, stream_select() returned
    immediately, reporting all streams as ready to read.

========================================
13. Other Changes
========================================

- Core:
  . The high resolution timer (`hrtime()`) on macOS now uses the recommended
    `clock_gettime_nsec_np(CLOCK_UPTIME_RAW)` API instead of
    `mach_absolute_time()`.
  . Exceptions now exclude arguments passed in the stack trace. If the old
    behaviour is desired, then set `zend.exception_ignore_args=0` in INI
    settings.
    RFC: https://wiki.php.net/rfc/exception_ignore_args_default_value

- CLI/CGI:
  . The `-z` or `--zend-extension` option has been removed as it was
    non-functional. Use `-d zend_extension=<path>` instead.

========================================
14. Performance Improvements
========================================

- ReflectionProperty:
  . Improved performance of the following methods: getValue(), getRawValue(),
    isInitialized(), setValue(), setRawValue().

- XMLReader:
  . Improved property access performance.

- XMLWriter:
  . Improved performance and reduce memory consumption.