Looking for an open source php/mysql ajax chat room (not 1-to-1 private chat). What would you guys recommend?
I am going to need to make hundreds of instances of the chat room (eg. each user group has their own exclusive chat room)
Take a look at phpFreeChat. It's an active project which is easy to implement.
I think Ajax Chat is great. https://blueimp.net/ajax/
Very customizable appearance and integration into your site.
I was hunting for a solution that fit in well with my existing layout... I thought phpfreechat was difficult... you may have more luck.
I think this can help you, its a very detailed article for your problem.
来源：https://stackoverflow.com/questions/1093251/php-mysql-ajax-chat