Russian letter X and utf-8?

Question

PHP

Good evening!
I am parsing news from the old version of the site to the new one. The old site is in UTF-8, the new one will also be in UTF-8.
Faced with the problem that instead of the Russian letter X, an incomprehensible symbol is shown. Accordingly, when writing to a new table, everything that was in the name after the letter X is cut off.
When trying to convert a string from utf8 to windows-1251 and back, at the first stage I get the error iconv(): Detected an illegal character in input string
This is how it turns out when parsing:
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Representatives of commercial organizations provided assistance. ......
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the parser is made in PHP and is run from the console

Answer 1

Change all x to normal

Answer 2

When parsing for the first time, put the u modifier on the type regular expression like this:
('/текст/ismu', $res)

Answer 3

1. I don’t see the point of transcoding something, you have both sites in UTF-8.
2. I also don’t see the point in the parser. What, the customer did not give you access to the database, or at least a dump?
3. Figure out what you really have for the symbol (its code).