Book Image

WordPress Plugin Development Cookbook - Second Edition

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook - Second Edition

By: Yannick Lefebvre

Overview of this book

WordPress is a popular, powerful, and open Content Management System. Learning how to extend its capabilities allows you to unleash its full potential, whether you're an administrator trying to find the right extension, a developer with a great idea to enhance the platform for the community, or a website developer working to fulfill a client's needs. This book shows readers how to navigate WordPress' vast set of API functions to create high-quality plugins with easy-to-configure administration interfaces. With new recipes and materials updated for the latest versions of WordPress 4.x, this second edition teaches you how to create plugins of varying complexity ranging from a few lines of code to complex extensions that provide intricate new capabilities. You'll start by using the basic mechanisms provided in WordPress to create plugins and execute custom user code. You will then see how to design administration panels, enhance the post editor with custom fields, store custom data, and modify site behavior based on the value of custom fields. You'll safely incorporate dynamic elements on web pages using scripting languages, and build new widgets that users will be able to add to WordPress sidebars and widget areas. By the end of this book, you will be able to create WordPress plugins to perform any task you can imagine.
Table of Contents (20 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Chapter 2. Plugin Framework Basics

In this chapter, we will cover the following topics:

  • Creating a plugin file and header
  • Adding output content to page headers using plugin actions
  • Using WordPress path utility functions to load external files and images
  • Modifying the site generator meta tag using plugin filters
  • Adding text after each item's content using plugin filters
  • Inserting link statistics tracking code in page body using plugin filters
  • Troubleshooting coding errors and printing variable content
  • Creating a new simple shortcode
  • Creating a new shortcode with parameters
  • Creating a new enclosing shortcode
  • Loading a style sheet to format plugin output
  • Writing plugins using object-oriented PHP