Problem with Greek characters

Question

Hello guys. I used this tutorial and it's works only with Latin characters. When I type something in Greek and I update it, it appears in question mark.
This is the tutorial https://www.webslesson.info/2017/01/php-pdo-crud-with-ajax-jquery-and-bootstrap.html?m=1

Answer 1

Ευχαριστώ πολύ!!