Articles

The Batch API is a powerful feature in Drupal that allows complex or time consuming tasks to be split into smaller parts.

For example, let's say you wanted to run a function that would go through every page on you Drupal site and perform an action. This might be removing specific authors or removing links in text. You might create a small loop that just loads all pages and performs the action on those pages.

This is normally fine on sites that have a small number of pages, like under 100 pages. But what happens when the site has 10,000 pages, or a million? Your little loop will soon hit the limits of PHP execution times or memory limits and cause the page to be terminated. How do you know how far your loop progressed through the data? What happens if you tried to restart the loop?

A common web design pattern is to incorporate an image into the design of the page. This creates a tighter integration with the image and the rest of the page.

The main issue in designing a page around the image is that the colours of the page must match the image. Otherwise this creates a dissonance between the image and the styles of the site.

In this article I will look at extracting a colour palette from an image so that it can be used in the design of a web page.

XML is a useful format for configuration, data storage, and transmitting data from one system to another. As a human readable format that can be easily read by machines it quickly gained favor in lots of different systems as a mechanism for data storage.

Many systems transparently make use of XML without the user ever seeing it. The API system SOAP is built around XML data, and it is normally possible to ask API endpoints to respond in either JSON or XML. It is common to see XML files used in configuration of systems as they can be easily edited and parsed when needed.

I have a lot of CDs. It isn't a "serious" collection, but I have been collecting CDs for at least 30 years so I have a couple of hundred there.

Taking a large CD collection everywhere with you isn't feasible, so I've been ribbing my collection to MP3 for a number of years. Recently, I've started to notice that MP3 doesn't have amazing sound quality, which is more apparent on higher quality audio equipment. MP3s are fine for cars and similar, but not ideal for listening on more serious sound systems.

Since my CD player died a few years ago I have been unable to listen to them in any other way. There is just something about the physical experience of playing music from a medium like the CD that appeals to me so I have still been buying CDs since then.

I was watching a video from NDC by Dylan Beattie the other day on The Story of Typography and a particular section stood out to me.

The talk ranges from the initial start of writing symbols to the formation of typography as an art form and the creation of eInk displays. Well worth a watch if you have some time to spare.

The part that was interesting to me was then discussing early word processors and the ASCII character standard. Early word processors couldn't store the amount of data required to fully render a font, so characters were rendered using a bitmap system.

Drupal's migration system allows the use of a number of different plugins to perform source, processing, and destination functions. 

Process plugins are responsible for copying and sometimes manipulating data into the destination. There are a number of different process plugins that allow you to get data in different ways and and apply it to your destination fields.

Both the core Migrate module and the excellent Migrate Plus module contain a number of different process plugins that you can use to process your data in different ways.

Pi day was a few weeks ago, but I came across this simple approximation of pi recently and decided to put together an example in PHP since it seemed pretty simple.

This approximation of pi centers around a real world example, but we can simulate this using some code.

Let's say you have a dart board that fits inside a square area so that it is flush with the outside of the square. Then you pick someone who is particularly bad at darts and get them to start throwing darts. Record where the darts hit and after a million or so darts you will have a number of darts that hit the board and a number of darts that hit the background.

A parabolic curve is a type of curve where every point is an equal distance from a focal point. There a number of different way to generate this sort of curve using math, but one of the simplest is to use straight lines to create the illusion of the curve.

The curve is created by diving two axis into equal points and then drawing a line from the first point on one axis to the last point on the opposite axis. Each line of the curve is drawn in the same way, repeating the process of drawing a line between opposite points for every point along the axis.

April 23rd, 2024 saw the first LocalGov Drupal Camp, held at the Birmingham Council buildings in Birmingham city center.

It's been ages since I attended an in person Drupal Camp in the UK, so when I saw that the LocalGov Drupal people were organising one just down the road for me I jumped at the chance to grab a ticket.

LocalGov Drupal is a distribution that combines Drupal, some configuration, some contributed modules, and some glue code with the aim of making it easier for councils to generate sites.

One of Drupal's strengths is its ability to create communities of users who contribute towards the content of the site. Whether you have an open forum, where users can create their own accounts, or a closed magazine with just a few editors your need to take the security of your users seriously.

Out of the box, Drupal has a number of account protection features that assist in making sure that users are authenticated correctly.

For example, the user login page is protected by a brute force system and will lock accounts after a number of incorrect password attempts in a short amount of time.