What is the best PHP chat room class?: I need a simple chat package

This package can Websocket chat that stores messages in MySQL using PDO.

It takes HTTP Websocket connections to handle chat messages exchanged between users in a chat room.

It also supports exchanging messages privately between users.

This package implements a chat system with Websockets or AJAX as fallback.

It generates HTML with JavaScript to connect to a chat server using Websockets.

It falls back to AJAX long polling requests if Websockets are not supported by the user browser version.

It provides the following features:

- Registration, login and password recovery of the users
- Search, add and group user contacts
- Broadcast messages to groups of users
- Desktop notifications, sound alerts, automatic scroll to new messages
- Exchange files between users
- Multiple chat sessions in different tabs
- Keep the history of old chat messages
- File Attachments
- Desktop notifications, sound alert, auto scroll to message
- Audio and video chat using WebRTC

By default it works with files for storage so it does not require a database server.