PHP is generally geared towards the application, not the backend. The backend is comprised of things like database servers, message queue systems, etc. It is, o

PHP is generally geared towards the application, not the backend. The backend is comprised of things like database servers, message queue systems, etc. It is, of course, not impossible to implement those services with PHP, but I don't think it is very common. Java, C, and C++ have been the traditional languages for that level with a few other more esoteric ones mixed in on occasion for certain tasks.