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

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1. Backward Incompatible Changes
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- 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.

- 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.

- 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.

- 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.

- SPL:
  . ArrayObject no longer accepts enums, as modifying the $name or $value
    properties can break engine assumptions.

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

- Core:
  . Added support for Closures in constant expressions.
    RFC: https://wiki.php.net/rfc/closures_in_const_expr

- 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.

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3. Changes in SAPI modules
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- 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.

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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

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

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

- 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.

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

- 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.

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

- 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.

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

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

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

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

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

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

- Core:
  . PHP_BUILD_DATE.

- POSIX:
  . POSIX_SC_OPEN_MAX.

- Sockets:
  . IPPROTO_ICMP/IPPROTO_ICMPV6.
  . TCP_FUNCTION_BLK (FreeBSD only).

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

- 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.

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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.

* 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.

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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()`.

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

- XMLWriter:
  . Improved performance and reduce memory consumption.