Deprecate passing null to non-nullable arg of internal function

This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the b

Deprecate passing null to non-nullable arg of internal function

This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the behavior
consistent with userland functions, where null is never accepted
for non-nullable arguments.

This change is expected to cause quite a lot of fallout. In most
cases, calling code should be adjusted to avoid passing null. In
some cases, PHP should be adjusted to make some function arguments
nullable. I have already fixed a number of functions before landing
this, but feel free to file a bug if you encounter a function that
doesn't accept null, but probably should. (The rule of thumb for
this to be applicable is that the function must have special behavior
for 0 or "", which is distinct from the natural behavior of the
parameter.)

RFC: https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg

Closes GH-6475.

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Make null byte error a ValueError

Currently we treat paths with null bytes as a TypeError, which is
incorrect, and rather inconsistent, as we treat empty paths as
ValueError. We do t

Make null byte error a ValueError

Currently we treat paths with null bytes as a TypeError, which is
incorrect, and rather inconsistent, as we treat empty paths as
ValueError. We do this because the error is generated by zpp and
it's easier to always throw TypeError there.

This changes the zpp implementation to throw a TypeError only if
the type is actually wrong and throw ValueError for null bytes.
The error message is also split accordingly, to be more precise.

Closes GH-6094.

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ValueError for empty path in stream code

Closes GH-5902

Remove unnecessary PHPDoc-alike blocks from tests

Closes GH-5759

Change argument error message format

Closes GH-5211

Make type error messages more consistent

Closes GH-5092

Make error messages more consistent by fixing capitalization

Closes GH-5066 As a first step, let's capitalize their initial letter when it is applicable.

Clean DONE tags from tests

Remove most of the `===DONE===` tags and its variations.
Keep `===DONE===` if the test output otherwise becomes empty.

Closes GH-4872.

Merge branch 'PHP-7.4'

Fix conflicts between tests with obscure filenames

Adjust tests for zpp TypeError change

Trim trailing whitespace in *.phpt

Trim trailing whitespace in tests

Revert r316345 which fixes all the tests again

- reject paths with trainling spaces using the very good new zend arg

- update test to the zeng arg path argument

Fix Windows tests after #47037

File system tests: checked on PHP 5.3 (Windows, Linux and Linux 64 bit).