Update UPGRADING wrt. PCRE2

The upgrade to PCRE2 should mostly be transparent to existing code, but
apparently there are some minor differences, which warrant a note in
UPGRADING (an

Update UPGRADING wrt. PCRE2

The upgrade to PCRE2 should mostly be transparent to existing code, but
apparently there are some minor differences, which warrant a note in
UPGRADING (and consequently, in the migration guide).

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Fixed bug #76509

In PHP static properties are shared between inheriting classes,
unless they are explicitly overwritten. However, because this
functionality was implemented using ref

Fixed bug #76509

In PHP static properties are shared between inheriting classes,
unless they are explicitly overwritten. However, because this
functionality was implemented using reference, it was possible
to break the implementation by reassigning the static property
reference.

This is fixed by switching the implementation from using references
to using INDIRECTs, which cannot be affected by userland code.

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Use COPY_DEREF for DIM_IS and LIST_R as well

Also add an upgrading note for the behavior change, not that we
expect anyone to be affected...

Remove useless PHPDBG_* constants

The sole purpose of `PHPDBG_FILE`, `PHPDBG_METHOD`, `PHPDBG_LINENO` and
`PHPDBG_FUNC` has been to be passed as first argument to `phpdbg_break`.
How

Remove useless PHPDBG_* constants

The sole purpose of `PHPDBG_FILE`, `PHPDBG_METHOD`, `PHPDBG_LINENO` and
`PHPDBG_FUNC` has been to be passed as first argument to `phpdbg_break`.
However, this functions is replaced as of PHP 5.6.3 by
`phpdbg_break_file`, `phpdbg_break_method` and 'phpdbg_break_func`,
respectively. Therefore, we're finally removing the useless constants.

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RFC: Argon2 Password Hash Enhancements Implementation of Argon2id per RFC https://wiki.php.net/rfc/argon2_password_hash_enhancements

- m4 and Windows configure scripts now forces Argon2 refe

RFC: Argon2 Password Hash Enhancements Implementation of Argon2id per RFC https://wiki.php.net/rfc/argon2_password_hash_enhancements

- m4 and Windows configure scripts now forces Argon2 reference library version >= 20161029
- Implementation tested against 20161029 and 20171227 for Argon2id support
- Updates Argon2 ext/standard/password/tests to run tests for both Argon2i and Argon2id

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Report unknown variables passed to compact()

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen t

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen to be generated during
parsing in our implementation. Additionally reusing the ParseError
class for this purpose would change existing error messages (if
the exception is not caught) from a "Fatal error:" to a "Parse
error:" prefix, and also the error kind from E_COMPILE_ERROR to
E_PARSE.

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Fixe bug #76386

..that is also a duplicate of #67122

Update data tables for Unicode 11

Deprecate image2wbmp()

According to https://wiki.php.net/rfc/image2wbmp, we deprecate
`image2wbmp()`, rename the `$threshold` parameter to `$foreground`, and
remove superfluous code.

[ci skip] Add UPGRADING note

Add note about heredoc BC break

UPGRADING tweaks

Fix a typo and clarify that Reflection changes only affect string
export. No API relevant return values are changed.

[ci skip]

Add some upgrading notes for mbstring

[ci skip] Add upgrading note

Update NEWS and UPGRADING for openssl_pkey_derive

Implement flexible heredoc/nowdoc syntax

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

* The ending label no longer has to be followed by a semicolon or
newli

Implement flexible heredoc/nowdoc syntax

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

* The ending label no longer has to be followed by a semicolon or
newline. Any non-label character is fine.
* The ending label may be indented. The indentation will be stripped
from all lines in the heredoc/nowdoc string.

Lexing of heredoc strings performs a scan-ahead to determine the
indentation of the ending label, so that the correct amount of
indentation can be removed when calculting the semantic values for
use by the parser. This makes the implementation quite a bit more
complicated than we would like :/

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[ci skip] Update UPGRADING

Cf. ce1d69a1f6dcf15d43029301059c25e5bc09a577 and
fef879a2d63899ed25f39b4581c16682afdd0a8f, respectively.

Patch provided by Gabriel Caruso.

Expose functionality for NFKC_Casefold normalization

Replace the deprecated API by the newer one available with ICU 56+

[ci skip] Update UPGRADING

5c5bd3033997583887bd990e54c68adb2934bbdb removed support for `--with-libmbfl`.

Add support for rl_completion_suppress_append and rl_completion_append_character

These options are only available with libreadline.

Remove redundant warning in array_push() and array_unshift()

Cf. https://github.com/php/php-src/pull/3011.

Implement #51368: php_filter_float does not allow custom thousand separators

A set of hard-coded thousand separator characters (presently, `',.`) is
somewhat limited (users may prefer ot

Implement #51368: php_filter_float does not allow custom thousand separators

A set of hard-coded thousand separator characters (presently, `',.`) is
somewhat limited (users may prefer other separators, such as spaces or
underscores), as well as somewhat too liberal (arbitrary combinations
of different thousand separators are presently possible). Therefore we
introduce a `thousand` option analogous to `decimal`, which allows to
define the desired thousand separators as non-empty string, defaulting
to `',.`. While we easily could support empty strings here as well,
that would not make much sense, since this behavior can more easily be
accomplished by not setting the `FILTER_FLAG_ALLOW_THOUSAND` flag in
the first place.

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[ci skip] Add normalizer_get_raw_decomposition to UPGRADING