Improve a few parameter names in ext/spl

Use the same names which are used by zend functions.

Remove unnecessary PHPDoc-alike blocks from tests

Closes GH-5759

Improve error messages of various extensions

Closes GH-5278

Automatically implement Stringable interface

Reindent phpt files

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.

Convert warnings to TypeError in php_spl.c

Closes GH-4991

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.

Don't silence fatal errors with @

Remove $errcontext argument to error handlers

I'm removing the argument entirely here, but we might want to change
this to passing null or and empty array instead, if the impact of
d

Remove $errcontext argument to error handlers

I'm removing the argument entirely here, but we might want to change
this to passing null or and empty array instead, if the impact of
dropping it entirely turns out to be too large.

This was deprecated as part of https://wiki.php.net/rfc/deprecations_php_7_2
as a doc-only deprecation.

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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

Committing for Robin Fernandes