How to decode Cyrillic in the text of the letter =D0=A1?

Question

PHP

Hello.
I pick up letters using the imap protocol, save them in the database for later reading.
Russian characters are represented as "=D0=A1 =D1=83=D0=B2=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0=B5=D0=BC"
Tell me how Is it correct to convert them to UTF-8?

Answer 1

The issue was resolved by investigating what it is.
The function quoted_printable_decode correctly translates into Cyrillic.