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

Adding custom categories for custom post types

To keep items organized on a site, administrators often use the built-in WordPress categories and terms to identify similar items. Looking back at the Book Reviews system that we have been putting in place so far in this chapter, a type of categorization that would be helpful is a book type (for example, Science Fiction, Documentary, Fiction, Poetry, and so on).

This recipe shows how to create a new category (known as a taxonomy in the WordPress backend) and associate it with the Book Review custom post type.

Getting ready

You should have already followed the Displaying custom post type data in shortcodes recipe, to have a starting point for this recipe, and the resulting plugin should still be active in your development site. Alternatively, you can get the resulting code (Chapter 4/ch4-book-reviews/ch4-book-reviews-v4.php) from the downloaded code bundle and rename the file ch4-book-reviews.php.

How to do it...

  1. Navigate to the ch4-book-reviews folder...