This is my created php real-time chat, I've created iframe wich reloads itself every 1.5 seconds and that's how it's real-time xD Idk if there are this kind of chats but this was my idea and I just wanted to do something fun.
Ok now how to use it, just download or clone the repository after what simply run it on a server, for ex. I runned in ngrok. And then when your client visits the website you can chat with him/her by overwriting and saving admin.txt, and if he/she typed you a message you'll see it in your chat.txt, ( advice simply keep them both opened and enjoy the chat)) )