How to build a "many writers and many readers" message queue?

Question

PHP

Chat. People/bots write messages, other people/bots read all sorts of messages/objects.
Store enough in memory (for the sake of speed). If you need to save for centuries, then I will add a reader who will read the queue and store it on disk. MemcacheQ
fits very nicely , but it has one reader :(

Answer 1

https://www.rabbitmq.com/

Answer 2

kafka.apache.org