attempts to mimic JS"s charCodeAt method, and the result of "c".charCodeAt () is 99.

I use mb_convert_encoding (99, "UTF-8"," Unicode, UCS-2, UCS-4, ASCII") , but the output remains the same.

(converted successfully with chr (99) , but what I want is to convert in deUnicode-- you know, it definitely exceeds the number of 255s).

question:

• Unicode converts c to 99. In PHP, how to convert 99 into c in the way of deUnicode?