Book Image

WordPress Plugin Development: Beginner's Guide

Book Image

WordPress Plugin Development: Beginner's Guide

Overview of this book

If you can write WordPress plug-ins, you can make WordPress do just about anything. From making the site easier to administer, to adding the odd tweak or new feature, to completely changing the way your blog works, plug-ins are the method WordPress offers to customize and extend its functionality. This book will show you how to build all sorts of WordPress plug-ins: admin plug-ins, Widgets, plug-ins that alter your post output, present custom "views" of your blog, and more. WordPress Plug-in Development (Beginner's Guide) focuses on teaching you all aspects of modern WordPress development. The book uses real and published WordPress plug-ins and follows their creation from the idea to the finishing touches, in a series of carefully picked, easy-to-follow tutorials. You will discover how to use the WordPress API in all typical situations, from displaying output on the site in the beginning to turning WordPress into a CMS in the last chapter. In Chapters 2 to 7 you will develop six concrete plug-ins and conquer all aspects of WordPress development. Each new chapter and each new plug-in introduces different features of WordPress and how to put them to good use, allowing you to gradually advance your knowledge. This book is written as a guide to take your WordPress skills from the very beginning to the level where you are able to completely understand how WordPress works and how you can use it to your advantage.
Table of Contents (14 chapters)
WordPress Plugin Development
Credits
About the Author
About the Reviewer
Preface
Index

Plugging in your first plugin


Usually, the first step in plugin creation is coming up with a plugin name. We usually want to use a name that is associated with what the plugin does, so we will call this plugin, WP Digg This. WP is a common prefix used to name WordPress plugins.

To introduce the plugin to WordPress, we need to create a standard plugin header. This will always be the first piece of code in the plugin file and it is used to identify the plugin to WordPress.

Time for action — Create your first plugin

In this example, we're going to write the code to register the plugin with WordPress, describe what the plugin does for the user, check whether it works on the currently installed version of WordPress, and to activate it.

  1. Create a file called wp-digg-this.php in your favourite text editor. It is common practice to use the plugin name as the name for the plugin file, with dashes '-' instead of spaces.

  2. Next, add a plugin information header. The format of the header is always the same...