Properly report unknown encoding in encoding lists

And clean up the related array and list parsing code.

Move encoding fetching outside php_mb_stripos()

Fix mb_ord() crash if internal encoding not supported

enc_name can be NULL here. Take the name from the mbfl_encoding
instead.

Fix length inconsistency in mb_convert_encoding

Don't mix strlen() and ZSTR_LEN(). If the encoding contains a
NULL byte, this will overflow the buffer.

NULL bytes will still mak

Fix length inconsistency in mb_convert_encoding

Don't mix strlen() and ZSTR_LEN(). If the encoding contains a
NULL byte, this will overflow the buffer.

NULL bytes will still make this behave oddly because the consuming
code will cut off the string there, but let's address that in master...

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Fix memory leak in mb_str_split

Only fetch to_encoding once in mb_convert_encoding()

Instead of doing it on every conversion. This is both more efficient
and avoids generating multiple warnings.

Allow empty needle in mb_strrchr()

Convert warnings to ValueError in mb_strpos function family.

Closes GH-5109

Handle mb_str(r)ipos offset consistently as well

Move offset error checking into mbfl_strpos

This avoids calculating the full length only in order to validate
the offset, as mbfl_strpos needs to find the offset internally
anyway.

Add #defines for mbfl_strpos error conditions

Don't leak encoding_str

Fix #79154: mb_convert_encoding() can modify $from_encoding

We must not modify arrays passed by value.

Fix #79149: SEGV in mb_convert_encoding with non-string encodings

We must not assume that `hash_entry` `IS_STRING`, but rather use
`encoding_str` which is guaranteed to be.

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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