This post discusses the challenges of integrating PHP applications and introduces Ecotone with RabbitMQ as a solution to simplify the integration process. It explains the difference between the logical and physical parts of a system and how Ecotone's Distributed Bus works to provide higher-level abstractions for communication between services. The post also covers topics such as sending commands and publishing events, keeping events private, distributing all events, decoupled message classes, error handling, and more.