What is the difference in index.php and qa-config-example.php

Question

This might be a very basic question, but these two pages have been troubling me. I am unable to understand the difference in the index.php and qa-config-example.php of q2a source code.

What are these two pages and what do they render?

Answer 1

index.php is basically the starting point for the web application (the main() function if you will).

qa-config-example.php has no function by itself. It's a configuration example that must be renamed to qa-config.php and filled with the desired configuration values. It's then sourced by other PHP files so that they have access to the config settings.