Cheaper reference construction

Added special cases for array_diff(), when first argument is an empty array or an array with single element.

Use cheaper API

Use cheaper functions

Remove RAND_RANGE() macro

The behavior of RANGE_RANGE() is 7.1 changed completely, from
rescaling an already generated number to generating a number
itself. Because of this str_shuff

Remove RAND_RANGE() macro

The behavior of RANGE_RANGE() is 7.1 changed completely, from
rescaling an already generated number to generating a number
itself. Because of this str_shuffle() ended up generating two
random numbers on every iteration.

To avoid further misuse the function is dropped entirely. Extensions
for PHP >= 7.1 should directly call php_mt_rand_range().

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Use cheaper SEPARATE macros

Use cheaper functions

Avoid unnecessary reference-counting on strings.

RC manipulation cleanup

Revert array_slice passthrough optimization

This reverts commit fabb5b7a7421280b43e6f11c59d9446f6b21e3e6.
This reverts commit e751e6cebad959592f223f99ffd2a60cdf51bed0.

Don't optimize input arrays with suffix holes

array_slice() passthrough for preserve_keys=true as well

Do not create a new array when slicing all of input array.

Encapsulate reference-counting primitives.
Prohibit direct update of GC_REFCOUNT(), GC_SET_REFCOUNT(), GC_ADDREF() and GC_DELREF() shoukf be instead.
Added mactros to validate reference-count

Encapsulate reference-counting primitives.
Prohibit direct update of GC_REFCOUNT(), GC_SET_REFCOUNT(), GC_ADDREF() and GC_DELREF() shoukf be instead.
Added mactros to validate reference-counting (disabled for now).
These macros are going to be used to eliminate race-condintions during reference-counting on data shared between threads.

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Avoid HashTable allocations for empty arrays (using zend_empty_array).

Fix datatypes and compiler warnings

Switch to size_t

Not critical as an unsigned is already used, but fixes a couple of
warnings in other areas.

Normalize signature

Fix datatypes and compiler warnings

Switch to size_t

Not critical as an unsigned is already used, but fixes a couple of
warnings in other areas.

Normalize signature

It's a function with the usual compare semantics, returning a platform
specific at least produces unnecessary warnings elsewhere and is otherwise
inappropriate.

Fix return value

Drop unused var

Fix compiler warnings

Fix compiler warning

Fix var name in arginfo

Fix cast

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HASH_FLAG_PERSISTENT renamed into IS_ARRAY_PERSISTENT and moved into GC_FLAGS (to be consistent with IS_STR_PERSISTENT).

Refactored recursion pretection

Fix typo retuns to returns

Kill compiler warnings in ext/standard

Optimize array_unique()

In SORT_STRING mode, instead of sorting the array, build a hash of
seen elements.

Use inlined version of zval_ptr_dtor() in array_map() loop

Remove superfluous semicolons

Avoid useless dereferences and separations during paramter passing.

Improved new Zend Parameter Parsing API to avoid useless dereferences.
This derefernce made sense only for explicit paramter passing by reference, but this feature was removed in PHP-7.
The i

Improved new Zend Parameter Parsing API to avoid useless dereferences.
This derefernce made sense only for explicit paramter passing by reference, but this feature was removed in PHP-7.
The improvement is 100% backward compatible, only few "tricky" functions may be affected (e.g. extract and usort).

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