Let's say you had a class that you wanted to use, but there was some sort of error in creating the object. This might be that the wrong parameters were passed, or the third party service (eg. a database) wasn't available at the time of creation.
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.