Can the Russian name saved in cookies be cut to the first letter?

Question

PHP

Hello everyone, please help. There is a Name written in cookies, on the php page I display it with this value <?php echo mb_substr ($_COOKIE['name567'],0,1); ?> (Only the first letter of the name is needed)
The whole site is encoded in utf8

On the local server, cuts to 1 letter and displays Cyrillic. I upload to the server
in place of the letter a question mark in a triangle. how can I solve this problem?

Answer 1

mb_internal_encoding("UTF-8");