We began this chapter by exploring the importance and architecture of WordPress plugins. Here, we identified the importance of creating reusable plugins by categorizing such plugins into three types called reusable libraries, extensible plugins, and pluggable plugins.

While building these plugins, we learned the use of actions, filters, and pluggable functions within WordPress. The integration of a media uploader was very important for web applications, which works with file-related functionalities. Also, we looked at how we can extend our content restrictions module with custom actions and filters. Finally, we discussed some important tips for building extendable plugins.

In the next chapter, Chapter 7, Customizing the Dashboard for Powerful Backends, we will master the use of the WordPress admin section to build highly customizable backends using existing features. Stay tuned, as this will be important...