Forbid use of not fully linked classes

Merge branch 'PHP-7.4'

Fixed bug #77633

Add a new class flag to inherit get_iterator() when implementing
the Iterator/IteratorAggregate interfaces and use it for
ArrayIterator.

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

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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Adios, yearly copyright ranges

Micro optimizations

Replace ZEND_ACC_ANON_BOUND, ZEND_ACC_UNRESOLVED_PARENT and ZEND_ACC_UNRESOLVED_INTERFACES with single ZEND_ACC_LINKED.

Get rid of ZEND_ACC_CTOR, ZEND_ACC_DTOR and ZEND_ACC_IMPLEMENTED_ABSTRACT

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VER

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VERIFY_ABSTRACT_CLASS opcodes.

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Fix some misspellings

Removed useless IS_UNDEF checks

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Improved user iterator implementation to reduce zend_class_entry memory consumption and avoid race condition during resolving/caching of user iterator functions of internal classes in ZTS build.

Fixed ability to call plain functions through zend_call_method()

zend_fcall_info_cache.calling_scope is not used by zend_call_function() and doesn't have to be initialized.
It's used only as a result of zend_is_callable() in forward_static_call and spl_autoloa

zend_fcall_info_cache.calling_scope is not used by zend_call_function() and doesn't have to be initialized.
It's used only as a result of zend_is_callable() in forward_static_call and spl_autoload.

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year++

zend_fcall_info_cache.initialized is removed (zend_fcall_info_cache is initialized if zend_fcall_info_cache.function_handler is set).

Move constants into read-only data segment

Move zend_object_iterator_funcs structures into read-only data segment

further sync for vim mode lines

"Countable" interface is moved from SPL to Core

Update copyright headers to 2017

Drop dead code in zend_call_method

As no_separation=1 is used this can not happen anymore.

Merge branch 'PHP-7.1'