Deprecate ${} string interpolation

https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Add %0 format to run-tests.php

This format matches against null bytes, and prevents the test
expectation from being interpreted as binary data.

bless_tests.php will automaticall

Add %0 format to run-tests.php

This format matches against null bytes, and prevents the test
expectation from being interpreted as binary data.

bless_tests.php will automatically replace \0 with %0 as well.

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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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Drop non-well formed numeric strings in strings function tests

Remove unnecessary PHPDoc-alike blocks from tests

Closes GH-5759

Improve some TypeError and ValueError messages

Closes GH-5377

Improve undefined variable error messages

Closes GH-5312

Define Stringable with __toString():string method

Change argument error message format

Closes GH-5211

Make type error messages more consistent

Closes GH-5092

Fix #78880: Another bunch of spelling errors

Promote warnings to exceptions in string search related functions

GH-5004

Convert some notices to warnings

Part of https://wiki.php.net/rfc/engine_warnings.

Improve strpos and strstr function family implementation

Adjust tests for zpp TypeError change

Always treat needles as strings

This is part of https://wiki.php.net/rfc/deprecations_php_7_3.

Trim trailing whitespace in *.phpt

Deprecate non-string needles in string search functions

Part of https://wiki.php.net/rfc/deprecations_php_7_3.

Use int instead of integer in type errors

PHP requires integer typehints to be written "int" and does not
allow "integer" as an alias. This changes type error messages to
match the a

Use int instead of integer in type errors

PHP requires integer typehints to be written "int" and does not
allow "integer" as an alias. This changes type error messages to
match the actual type name and avoids confusing messages like
"must be of the type integer, integer given".

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Fix #72948: Uncatchable "Catchable" fatal error for class to string conversions

E_RECOVERABLE errors are reported as "Catchable fatal error". This is
misleading, because they actually ca

Fix #72948: Uncatchable "Catchable" fatal error for class to string conversions

E_RECOVERABLE errors are reported as "Catchable fatal error". This is
misleading, because they actually can't be caught via try-catch statements.
Therefore we change the wording to "Recoverable fatal error" as suggested by
Nikita.

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strpos()/stripos(): Add support for negative offsets

Scalar type hints with ZPP casting rules

Use "float" and "integer" in typehint and zpp errors

non living code related typo fixes

Fix test after fix for bug #63943 (Bad warning text from strpos() on empty needle)
See commit c05ee74e7ff28b49018bf3e8f452bfd5386d1b68