The Shield module prevents access to a Drupal site by putting a Apache authentication system across the entire website. This means that to access the site you need a username and password.

This is useful in a number of different situations, but I use it most for protecting dev and staging sites from access. It's not the most complex authentication system in the world, but it's enough to prevent the embarrassment caused by having staging sites being spidered by search engines.

I've been using PHP for a number of years and have seen the same things being done with return values from functions over and over again. I have always thought of this as pretty standard, but the more I think about it the less it makes sense. Looking back over my career I am quite sure that a few serious bugs could have been avoided if I had not mixed return types.

I wanted to impart a piece of advice to do with validation and formatting of user input, although I've never seen anyone suggest it. I guess it would come under the single responsibility principle so it might seem obvious to some people. There can be reasons why this might at least seem like a good idea at the time.

Following on from my last post about sorting colors I have been thinking about different ways of sorting colors. I have been looking at interfaces that allow people to select colors and they will quite normally have a band of colors that does look nicely sorted. As it turns out this is perfectly possible to do if the colors are normalised to remove light and dark variations of different colors.

I came across this sorting algorithm the other day called 'bogo sort'. This is a sort of joke sorting algorithm that is highly ineffective at actually sorting arrays. The name comes from the word 'bogus'.

Here is how it works.

I have been doing some reading and watching lectures of programming theory recently and I was reminded of this algorithm I learned about in university. Binary searching an array is a divide and conquer algorithm that takes an array and searches for a value in that array by splitting the array into halves. The algorithm works like this.

Drupal 8's comment system has the ability to be threaded so that users can reply directly to other users comments and create threads of conversation. I have always found this difficult to use and difficult to read so I wanted to turn it off when I set up this site. The only issue I had was I could turn off the threading but couldn't alter the ordering of the comments.