Remove copyright years.

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Fixed crash

Fixed crash

Implement ??= operator

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

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree

Implement ??= operator

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

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree that this is possible. In particular
in $a[foo()] ?? $b function foo() is only ever called once.
However, the variable access themselves will be reevaluated.

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Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwe

Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwei9@hotmail.com>
Co-authored-by: Joe Watkins <krakjoe@php.net>
Co-authored-by: Dmitry Stogov <dmitry@zend.com>

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Implement ZEND_ARRAY_KEY_EXISTS opcode to speed up array_key_exists()

Future-proof email addresses

Future-proof email addresses...

Fixed bug #77058

Account for the fact that undef must be interpreted as null for
the purposes of INC/DEC inference.

Improve "narrowing" error message

By including the opcode name.

Trim trailing whitespace in source code files

Trim trailing whitespace in source code files

Replace ZEND_ACC_ANON_BOUND, ZEND_ACC_UNRESOLVED_PARENT and ZEND_ACC_UNRESOLVED_INTERFACES with single ZEND_ACC_LINKED.

ZEND_DECLARE_CLASS, ZEND_DECLARE_INHERITED_CLASS and ZEND_DECLARE_INHERITED_CLASS_DELAYED don't need return value anymore.

Keep information about unresolved parent class in zend_class_entry->parent_name

Avoid hash lookups in BIND_STATIC and BIND_LEXICAL opcode handlers.
Encode static variable offset into opline->extended_value.

Partial revert of 30156d588c07e26d4e752ddb62344e96854d4773

Fixed bug #63217

Don't automatically convert literal string keys to integers on
array access, as we may be dealing with an ArrayAccess object,
rather than a plain array.

Fix typo in compound dim assign op inference

Thankfully a harmless one, just makes inference results worse.

Cleanup conditions

Restored zend_array_element_type() prototype

Update array_element_type inference for previous change

LIST_R and DIM_IS return value can't be MAY_BE_REF anymore.

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...

Improved type inference. Result of opcodes using ZVAL_COPY_DEREF can't be MAY_BE_REF.