There are a number of different tools that allow you to validate and test a Drupal site. Inspecting your custom code allows you to adhere to coding standards and ensure that you stamp our common coding problems. Adding tests allows you to make certain that the functionality of your Drupal site works correctly.
This year's DrupalCon Europe was hosted between the 17th and 20th of October, in the French city of Lille. My DrupalCon adventure began early on Monday morning when Chris Maiden picked me up to drive to France via the EuroStar train. We arrived in Lille a little after 4pm, which was really good going for a nearly 400+ mile trip.
Using frameworks to handle the authentication of your PHP application is perfectly fine to do, and normally encouraged. They abstract away all of the complexity of managing users and sessions that need to work in order to allow your application to function.
A sparkline is a very small line graph that is intended to convey some simple information, usually in terms of a numeric value over time. They tend to lack axes or other labels and are added to information readouts in order to expand on numbers in order to give them more context.
Drupal's modular system allows for all kinds of additions to be added to your site through plugins, entities and configuration.