Comparison cleanup:

- introduce zend_compare() that returns -1,0,1 dirctly (without intermediate zval)
- remove compare_objects() object handler, and keep only compare() handler

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Add ext/gmp stubs

Merge branch 'PHP-7.4'

Remove unused gmp_unary_ui_op() function

Replace ZVAL_COPY() and ZVAL_COPY_VALUE() for IS_OBJECT by cheaper macros

Avoid uninitialized variable warnings in gmp

Avoid uninitialized variable warnings in gmp

Refactor zend_object_handlers API to pass zend_object* and zend_string* insted of zval(s).

Merge branch 'PHP-7.4'

* PHP-7.4:
Remove local variables

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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Remove yearly range from copyright notice

Remove year range from copyright notice

Remove deprecated gmp_random() function

Deprecated in PHP 7.2 as part of
https://wiki.php.net/rfc/deprecations_php_7_2.

Fix typos in code comments

Fixed wrong zval_dtor() usage

Use zval_ptr_dtor() instead of zval_dtor() in internal functions that destroy new created object (This is safer and produces less code)

Replace legacy zval_dtor() by zval_ptr_dtor_nogc() or even more specialized destructors.
zval_dtor() doesn't make a lot of sense in PHP-7.* and it's used incorrectly in some places.
Its occur

Replace legacy zval_dtor() by zval_ptr_dtor_nogc() or even more specialized destructors.
zval_dtor() doesn't make a lot of sense in PHP-7.* and it's used incorrectly in some places.
Its occurances should be replaced by zval_ptr_dtor() or zval_ptr_dtor_nogc(), or even more specialized destructors.

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Export standard object handlers, to avoid indirect access

Use zend_string_release_ex() instread of zend_string_release() in places, where we sure about string persistence.

Merge branch 'PHP-7.2'

Merge branch 'PHP-7.1' into PHP-7.2

Fix incorrect printf modifiers

Reduce variable scope

Remove effectless assignment