6- Azure Service Bus
Microsoft Azure Service Bus is a fully managed enterprise integration message broker. It support familiar concepts like Queues, Topics, Rules/Filters and much more.
High Level Architecture
Evaluation Table - Details
Azure Service Bus supports AMQP 1.0, and couple of languages, PHP support is again limited for the protocol
|acknowledge()||Available||accept() / release()|
|subscribe()||*Workaround||Long Polling might need to be implemented, unless we find a good library that supports AMQP 1.0 for PHP; Java has full support for required features.|