Allow array_diff() and array_intersect() with single array argument

Both of these functions are well-defined when used with a single
array argument -- rejecting this case was an artifici

Allow array_diff() and array_intersect() with single array argument

Both of these functions are well-defined when used with a single
array argument -- rejecting this case was an artificial limitation.
This is not useful when called with explicit arguments, but removes
edge-cases when used with argument unpacking:

// OK even if $excludes is empty.
array_diff($array, ...$excludes);

// OK even if $arrays contains a single array only.
array_intersect(...$arrays);

This matches the behavior of functions like array_merge() and
array_push(), which also allow calls with no array or a single
array respectively.

Closes GH-6097.

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Rename standard array function parameters to $array

This is targeting 8.0.

`$arg` seems like a poor choice of a name,
especially if the function were to have arguments added.

Rename standard array function parameters to $array

This is targeting 8.0.

`$arg` seems like a poor choice of a name,
especially if the function were to have arguments added.

In many cases, the php.net documentation already has $array for these functions.
E.g. https://www.php.net/manual/en/function.array-intersect.php

I'd assume that since named arguments was added to 8.0 near the feature freeze,
PHP's maintainers had planned to make the names consistent
and gradually use the same name for docs and implementation.

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Remove unnecessary PHPDoc-alike blocks from tests

Closes GH-5759

Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return typ

Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return type errors match the format of argument errors.

Closes GH-5625

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Improve argument error messages in ext/standard

Closes GH-5198

Reindent phpt files

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.

Convert some warnings to TypeErrors in array functions

This is manual type and argument number checking code that was not
covered by the zpp move to TypeErrors.

Trim trailing whitespace in *.phpt

Trim trailing whitespace in *.phpt

Trim trailing whitespace in *.phpt

Trim trailing whitespace in *.phpt

Trim trailing whitespace in tests

Make array parsing parameters error messages consistency with ZPP failure

Array tests: checked on PHP 5.2.6, 5.3 and 6.0 (Windows, Linux and Linux 64 bit).