Which chat script or private messages can be taken into account?

Question

Chats

There is an admin panel and there is a user account.
What is a simple chat script that would have the following functions in it
- The admin had correspondence with users with auto-update when the user writes to the admin and from the user's side, too, auto-update the chat, so to speak.
- So that the user would have a connection only with the administrator.
- So that the correspondence is saved somewhere in the database or in a file, and if the admin clears the correspondence, then it is also deleted from the client.
- Ability to register the admin login separately.
- Ability to upload pictures and immediately display them as an image and not a file to be downloaded.
- What would be the field for inserting the username (it will be hidden and entered through php output)
- And if there is such that if the message is not read from one or the other side, then a notification is sent to the mail.
- So that the chat is displayed on an existing page for the user and the admin will get only an iframe with the admin panel supposedly.
I superficially explained the principle of operation. In the search, I don’t know how to adequately search for a chat or private messages.

Answer 1

Join. everything you described is here.
* installed on linux, windows
* supports mysql, postgree, sqlite
* integrates with the existing security system
* real-time update (long pooling)
* mit license
https://github.com/vkorotenko/ChatApplication/