Promote some warnings to ValueError in mbstring

Promoted warnings are:
* Empty encoding lists
* Unknown language
* Start and Width out of bound

Convert some if blocks to assertions

Fix Bug #79448 0 is a valid Unicode codepoint, but mb_substitute_character(0) fails

Promote unknown encoding throws in encoding array/string list

For the string list we emit still emit a warning by comparing arg_num to 0

Closes GH-5337

Refactor mb_substr_count()

Promote empty needle warning to ValueError
Convert if branch into an assertion as if mbfl_substr_count fails this now implies a bug
Thus mb_substr_count()

Refactor mb_substr_count()

Promote empty needle warning to ValueError
Convert if branch into an assertion as if mbfl_substr_count fails this now implies a bug
Thus mb_substr_count() can only return int now, fix stubs accordingly

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Convert if branch to assertion in mb_strlen

This operation should never fail, therefore it's converted to an assertion.
Thus this mb_strlen() can now only return int, fix stubs according

Convert if branch to assertion in mb_strlen

This operation should never fail, therefore it's converted to an assertion.
Thus this mb_strlen() can now only return int, fix stubs accordingly

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Promote mb_str_split warning to ValueError

Also add a TODO about documenting this funcion on PHP.net
Convert some checks to assertions as if they don't hold something went wrong during m

Promote mb_str_split warning to ValueError

Also add a TODO about documenting this funcion on PHP.net
Convert some checks to assertions as if they don't hold something went wrong during memory allocation
Due to these changes this function cannot return false anymore, fix stubs accordingly

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Merge mb_strstr() variants under a common implementation

This reduces heavy ducplicate code

Improve code flow

These nested if-else blocks are unnecessary since we return early.

Promote empty string warning to ValueError in mb_ord()

Fix bug 79441

Promote unsupported encoding warnings to ValueError

Use php_mb_get_encoding instead of mbfl_name2encoding to get encoding

This reduces the number of places where the error message template is used.
Also promote the mb_check_encoding() war

Use php_mb_get_encoding instead of mbfl_name2encoding to get encoding

This reduces the number of places where the error message template is used.
Also promote the mb_check_encoding() warning to ValueError and add a test to cover the behaviour.

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Move encoding fetching out of php_mb_convert_encoding()

Remove unnecesary check in php_mb_check_encoding()

The caller makes sure that this is not NULL.

Convert some unknown encoding warnings to ValueErrors in ext/mbstring

Promotes only the warnings where the encoding comes only from a string.
Functions which accept an array of encodings

Convert some unknown encoding warnings to ValueErrors in ext/mbstring

Promotes only the warnings where the encoding comes only from a string.
Functions which accept an array of encodings will be fixed at a later stage.

Closes GH-5317

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Make sure mbstring.internal_encoding deprecation is always thrown

It was not thrown if the setting was specified via -d at least.

mb_detect_order(): Use proper array|string argument

Remove persistent arg from parse_encoding_array()

It is always zero.

mb_check_encoding(): Make var a proper array|string arg

mb_detect_encoding(): Use proper array|string parameter

Needed to add support for nullabiltiy in some places.

mb_convert_variables(): Make $from an array|string argument

mb_convert_encoding(): Make $input a proper array|string arg

mb_convert_encoding(): Make $from_encodings a proper array|string arg

Switching to FastZPP, as we don't support this in normal zpp.

Parse mb_convert_encoding() encodings only once

Instead of re-parsing them for every converted value. Also reuse
the generic parse_array() helper.