Allow empty needles in mb_strpos and mb_strstr function family.

MBstring analogous implementation to 6d578482a933be7597b686b59a935b316161d251

Closes GH-4977

Use RETURN_THROWS() in various places

Use RETURN_THROWS() after try_convert_to_string()

Use RETURN_THROWS() after zend_value_error()

Use RETURN_THROWS() during ZPP in most of the extensions

Except for some bigger ones: reflection, sodium, spl

Convert string|array union parameter types

Closes GH-4995

Remove deprecated behaviour of passing encoding as third parameter in mb_strrpos()

Merged GH-5011

Expect appropriate parameter type in the first place

`mb_encode_numericentity()` and `mb_decode_numericentity()` accepted
arbitrary zvals as `$convmap`, but ignored anything else than ar

Expect appropriate parameter type in the first place

`mb_encode_numericentity()` and `mb_decode_numericentity()` accepted
arbitrary zvals as `$convmap`, but ignored anything else than arrays.
This appears to be an unresolved relict of their ZPP conversion for
PHP 5.3[1]. We now expect an array in the first place.

We also expect `count($convmap)` to be a multiple of four (else we
throw a `ValueError`), and do no longer special case empty `$convmap`.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=1c77f594294aee9d60e7309279c616c01c39ba9d>

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Explicitly declare empty parameter list

Add MBString arginfo stubs

Add support for mbstring.regex_retry_limit

This is very similar to the existing mbstring.regex_stack_limit,
but for backtracking. The default value matches pcre.backtrack_limit.
Only

Add support for mbstring.regex_retry_limit

This is very similar to the existing mbstring.regex_stack_limit,
but for backtracking. The default value matches pcre.backtrack_limit.
Only used on libonig >= 2.8.0.

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Fix #78609: mb_check_encoding() no longer supports stringable objects

We apply type juggling for other types than array.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Remove unused parameter

Cf. <https://bugs.php.net/78579>.

Fix #78579: mb_decode_numericentity: args number inconsistency

mb_decode_numericentity() accepts a fourth optional parameter, which is
unused, however. Since this parameter doesn't do a

Fix #78579: mb_decode_numericentity: args number inconsistency

mb_decode_numericentity() accepts a fourth optional parameter, which is
unused, however. Since this parameter doesn't do any harm, and to avoid
the small BC break, we're keeping this parameter for PHP 7, but adjust
the arginfo.

For PHP 8, we will remove this parameter.

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Deprecate encoding as 3rd param to mb_strrpos()

Fix unused variable warnings when mbregex disabled

Cheaper checks for exceptions thrown from __toString()

Allow exceptions in __toString()

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

And convert some object to string conversion related recoverable
fatal errors into Error excep

Allow exceptions in __toString()

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

And convert some object to string conversion related recoverable
fatal errors into Error exceptions.

Improve exception safety of internal code performing string
conversions.

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Fixed compatibility with phpdbg

Fix internal_encoding fallback in mbstring

By introducing a hook that is called whenever one of
internal_encoding / input_encoding / output_encoding changes, so
that mbstring can adj

Fix internal_encoding fallback in mbstring

By introducing a hook that is called whenever one of
internal_encoding / input_encoding / output_encoding changes, so
that mbstring can adjust it's internal state.

This also makes internal_encoding work with zend multibyte.

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Avoid misc uninitialized variable warnings

Avoid misc uninitialized variable warnings

Fix key leaks in mb_convert_encoding()

Avoid onig match param unused variable warning