How to fix weirdness in PHP chr() behavior?

Question

PHP

The program must return a character using the code from the ASCII table. Up to 128 everything works fine, but after that it gives out questions � instead of symbols. I know that the problem is in the encoding, but I do not know how to solve it. Comrades, tell me, maybe there are some functions or plugins for PHP that allow you to get rid of this nonsense? Thanks in advance to everyone who will respond.

Answer 1

This is normal behavior: there is no character with this code in UTF-8.
First, decide what result you want to get.

Answer 2

I advise you to pay attention to the comments when referring to the php documentation:
php.net/manual/en/function.chr.php#55978