Implement new custom object serialization mechanism

RFC: https://wiki.php.net/rfc/custom_object_serialization

Fix bug #73948

If PREG_UNMATCHED_AS_NULL is used, make sure that unmatched capturing
groups at the end are also set to null, rather than just those in the
middle.

Sync the changes to ext/filter with 7.4, now that it works.

- Removed --with-pcre-dir
- The filter extension can now be built as shared on Unix with ./configure

Unbundle ext/wddx

The extension is now available from <https://pecl.php.net/package/wddx>.

Cf. <https://wiki.php.net/rfc/deprecate-and-remove-ext-wddx>.

Fix #77094: Add flags support for pcre_replace_callback(_array)

Fixed bug #72685

We currently have a large performance problem when implementing lexers
working on UTF-8 strings in PHP. This kind of code tends to perform a
large number of matches

Fixed bug #72685

We currently have a large performance problem when implementing lexers
working on UTF-8 strings in PHP. This kind of code tends to perform a
large number of matches at different offsets on a single string. This
is generally fast. However, if /u mode is used, the full string will
be UTF-8 validated on each match. This results in quadratic runtime.

This patch fixes the issue by adding a IS_STR_VALID_UTF8 flag, which
is set when we have determined that the string is valid UTF8 and
further validation is skipped.

A limitation of this approach is that we can't set the flag for interned
strings. I think this is not a problem for this use-case which will
generally work on dynamic data. If we want to use this flag for other
purposes as well (mbstring?) then it might be worthwhile to UTF-8 validate
strings during interning. But right now this doesn't seem useful.

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weakrefs upgrading note

Fix #71890: Add support for crc32c Castagnoli's polynomial.

This variant of crc32 is heavily used by storage systems, such as iSCSI, SCTP,
Btrfs, ext4, and is increasingly being used in

Fix #71890: Add support for crc32c Castagnoli's polynomial.

This variant of crc32 is heavily used by storage systems, such as iSCSI, SCTP,
Btrfs, ext4, and is increasingly being used in API (such as Google Cloud
Storage, and Apache Kafka).

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Revert "Detect invalid uses of parent:: during compilation"

This reverts commit a9e6667817c38f22f4645ec5b4e5c6b0e4b928fa.

Breakage found in the wild: Mockery uses a parent:: call in

Revert "Detect invalid uses of parent:: during compilation"

This reverts commit a9e6667817c38f22f4645ec5b4e5c6b0e4b928fa.

Breakage found in the wild: Mockery uses a parent:: call in the
implementation regardless of whether the class has a parent or not:
https://github.com/mockery/mockery/blob/4324afeaf9d95b492507e6587abb3f024e2576de/library/Mockery/Mock.php#L600

This change is not worth the compat break in 7.4.

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Remove mysqli embedded server support

This code is not compatible with PHP 7.0. The fact that nobody
complained that the mysqli embedded server functionality doesn't
build anymore se

Remove mysqli embedded server support

This code is not compatible with PHP 7.0. The fact that nobody
complained that the mysqli embedded server functionality doesn't
build anymore seems like a strong signal that we can drop it...

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Fixed bug #77631

Do not include unbound anonymous classes in get_declared_classes().

Note that earlier PHP versions would include the anonymous class in
get_declared_classes(),

Fixed bug #77631

Do not include unbound anonymous classes in get_declared_classes().

Note that earlier PHP versions would include the anonymous class in
get_declared_classes(), and return false until the class was bound,
but would not crash.

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use pkg-config for libedit

UPGRADING entry for pcntl_unshare [skip ci]

Deprecate case-insensitive constants via typelib import

As of PHP 7.3.0, case-insensitive constants are deprecated. We catch
up on this with regard to ext/com_dotnet, which allows to im

Deprecate case-insensitive constants via typelib import

As of PHP 7.3.0, case-insensitive constants are deprecated. We catch
up on this with regard to ext/com_dotnet, which allows to import
constants from typelibs, by triggering a deprecation notice whenever
`com_load_typelib()` is called with `$case_sensitive` being `false`,
and whenever `com.autoregister_casesensitive` is set to `false`,
regardless of whether there are actually constants in the typelib which
would be imported.

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Implement ReflectionReference

RFC: https://wiki.php.net/rfc/reference_reflection

Update NEWS and UPGRADING [ci skip]

Implement mb_str_split()

RFC: https://wiki.php.net/rfc/mb_str_split

Correct section number in UPGRADING

This make the top list follow the bottom numbering

[ci skip]

Adding bunch of FreeBSD socket options flags specifics.

SO_USER_COOKIE primarly to be traced via dtrace instrumentation.
If SO_USER_COOKIE is available, the rest is so the former is

Adding bunch of FreeBSD socket options flags specifics.

SO_USER_COOKIE primarly to be traced via dtrace instrumentation.
If SO_USER_COOKIE is available, the rest is so the former is
two years old while the rest is from around 2008.

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Deprecate ext/wddx

Cf. <https://wiki.php.net/rfc/deprecate-and-remove-ext-wddx>.

Add UPGRADING notes for oniguruma unbundling

Disable PEAR by default

Installation of PEAR can be enabled using --with-pear, but will
through a deprecation warning during ./configure.

[ci skip] Update changelog

[ci skip] Move OPcache configure option changes

Mark ldap_control_paged_result and ldap_control_paged_result_response as deprecated

These functions have serious limitations and may confuse users.
Same operations can be done using the

Mark ldap_control_paged_result and ldap_control_paged_result_response as deprecated

These functions have serious limitations and may confuse users.
Same operations can be done using the new ldap control system in search
operations.

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