Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instea

Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instead of looping and skipping 100000 times.

Add a new test of array_slice handling unset offsets.

Closes GH-4860.

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Allow array_splice() length to be null

Add Z_PARAM_LONG_OR_NULL macro

Comparison cleanup:

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

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime constructor also accepts zero arguments
* hash_update_file() stream context is optional
* xmlwriter_write_dtd_entity() $isparam argument is optional

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Remove most uses of ZEND_PARSE_PARAMETERS_END_EX()

As ZPP now throws, it makes no sense to specify an explicit return
value.

Promote warnings to error in array_flip()

Closes GH-4576.

Promote warnings to errors in array_push()

This is in line with the engine change from
https://wiki.php.net/rfc/engine_warnings.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Indicate entry is skipped in error message

Merge branch 'PHP-7.4'

Check for exception after calling count_values()

To avoid a duplicate error if count_values() throws.

Promote warnings to errors in array_walk(_recursive)()

Promote warnings to errors in compact()

Promote warnings to errors in array_merge(_recursive)() and array_replace()

Promote warnings to errors in extract()

Promote warnings to errors in max()

Promote warnings to errors in min()

Assert that symbol table is available in compact()

I believe NULL here is no longer possible due to the dynamic call
check. A similar assumption already exists in the extract()
imple

Assert that symbol table is available in compact()

I believe NULL here is no longer possible due to the dynamic call
check. A similar assumption already exists in the extract()
implementation.

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Promote warnings to errors in array_rand()

Convert remaining array function arginfo to PHP stubs

Promote warnings to errors in array_pad()

Promote warnings to errors in array_column()

Promote warnings to errors in array_combine()

Promote warnings to errors in array_multisort()