Use ZSTR_ API to access zend_string elements (this is just renaming without semantick changes).

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>
Date: Fri Jun 26 01:23:31 2015 +0200

Use the new 'ZSTR' macros in the rest of the code.

Does not change anything to the generated code (thanks to compat macros) but cleaner.

commit b3526439104ac7a89a8e0c79dbebf33b22bd01b8
Author: Francois Laupretre <francois@tekwire.net>
Date: Thu Jun 25 13:45:06 2015 +0200

Improve zend_string API

Add missing methods

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Feature: Enhanced array_column() to also work with object elements.

Fix more proto comments

Fixed crash in Zend/tests/bug69891.phpt on x86 (32-bit).
compare_function() now has to be compatible with binary_op_type (use fastcall convention).
Introduced new zval_compare_function() to b

Fixed crash in Zend/tests/bug69891.phpt on x86 (32-bit).
compare_function() now has to be compatible with binary_op_type (use fastcall convention).
Introduced new zval_compare_function() to be used as zval comparison callback instead of compare_function().

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Micro optimization

Improved variable name validation

Support references in convert_to_*

conver_to_* functions now accept REFERENCE values, which will be
unwrapped before performing the usual conversion. This is consistent
with convert_

Support references in convert_to_*

conver_to_* functions now accept REFERENCE values, which will be
unwrapped before performing the usual conversion. This is consistent
with convert_scalar_to_number and matches the expected behavior in
a couple random use-sites I checked.

Also includes a couple fixes/cleanups elsewhere and two tests for
cases that previously didn't work (though the reference issue existed
all over the place).

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Get rid of more ZVAL_ZVAL() macros

Avoid zval duplication in ZVAL_ZVAL() macro (it was necessary only in few places).
Switch from ZVAL_ZVAL() to simpler macros where possible (it makes sense to review remaining places)

Make convert_to_* safe with rc>1

This only involves switching zval_dtor to zval_ptr_dtor for arrays
and making the convert_to_object for arrays a bit more generic.

All the other

Make convert_to_* safe with rc>1

This only involves switching zval_dtor to zval_ptr_dtor for arrays
and making the convert_to_object for arrays a bit more generic.

All the other changes outside zend_operators.c just make use of
this new ability (use COPY instead of DUP).

What's still missing: Proper references handling. I've seen many
convert_to* calls that will break when a reference is used.

Also fixes bug #69788.

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Fixed bug #69723 (Passing parameters by reference and array_column)

fix typos

Signed-off-by: olshevskiy87 <olshevskiy87@bk.ru>

Improve fast_is_[not_]identical() functions to teturn value instead of takeing additional arguments.
Pair INSTANCEOF with the following JMPZ/JMPNZ.

Clean up some type conversions

While at it also fix some type checks in iconv and drop dead and
unported code in standard/filters.

Fix bug #69413

Use new macros

Fixed bug #69371 (Hash table collision leads to inaccessible array keys)

Fix separation in array_multisort

This manifested in Zend/tests/bug52939.phpt when running without
opcache (no immutablization).

Micro opt

Fixed bug #69299 (Regression in array_filter's $flag argument in PHP 7)

fix datatype mismatches

Changed HashTable layout:

Removed HashTable->arHash (reduced memory consumption). Now hash slots may be accessed using HT_HASH() macro.
Hash slotas are allocated together with Buckets (b

Changed HashTable layout:

Removed HashTable->arHash (reduced memory consumption). Now hash slots may be accessed using HT_HASH() macro.
Hash slotas are allocated together with Buckets (before them) and lay in reverse order from HashTable->arData base address (see comments in Zend/zend_types.h)
Indexes in hash table and conflict resolution chains (Z_NEXT) may be stored as indeces or offsets in bytes, depending on system (32 or 64-bit).
HashTable data filelds are reordered to keep the most useful for zend_hash_find() data in the same CPU cache line.

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Use specialized macro for string zval creation

Array - make krsort FAST_ZPP compatibility