About marking read topics

[Koji]

Hello, I'm having a bit of trouble setting up the logic. How can I mark the content read as read with PHP? It seems to work in the notification logic, but not exactly like a notification :laugh: On the left, there are topics listed from the database, and when clicked, you can read the topic on the right side without refreshing the page. For example, in the left block, I want to display the titles of unread topics in bold and the read ones normally. If anyone has ideas on how I can solve this, I would appreciate your input.