Derick Rethans has announced the first official release of his D-Bus extension that makes it possible for PHP applications (and ones built in other languages) to interact directly with each other.
A few days ago I made the first beta release of the D-Bus extension that I have been working on for a while. D-Bus is a message bus system, a simple way for applications to talk to one another. I started working on this because my cellphone. [...] However, many other applications on the Linux desktop speak D-Bus. This includes system services such as the notification daemon, the screen saver and hardware plug-in detection as well as desktop applications such as Pidgin and Empathy.