Recently, I encountered a problem installing the previous version of php on Debian. (I'm using the testing branch, php came as 5.6.x, but I needed to roll back to 5.5.x). Let's see how we can install the previous version.
Nginx is an HTTP server. Compared to apache, it is more resilient and capable of handling a larger number of connections. It is mainly used on production servers, although it is rarely configured for local development, even though it is no more difficult than configuring apache + php.