http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/html/chat-app.txt
If the variable has been passed via a URL, such as the link mentioned above, we proceed to end the session of the user's name.
Before destroying the user's name session with the session_destroy() function, we want to write a simple exit message to the chat log.