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 fields to the user editor

Similar to the taxonomy editor, the user editor allows developers to add extra fields through action hooks and facilitates this task by using the same HTML structure, whether a new user is being created or an existing one is modified. This recipe shows how to assign a callback function to add a new section to the user editor.

Getting ready

To create a complete plugin with a stylesheet and administration panel, you should have already followed the Storing stylesheet data in user settings recipe in Chapter 3, User Settings and Administration Pages, to have a starting point for this recipe. Alternatively, you can get the resulting code (Chapter 3/ch2-private-item-text-edit-stylesheet/ch2-private-item-text.php) from the downloaded code bundle and rename ch2-private-item-text-edit-stylesheet to ch2-private-item-text.

It is also possible to just create a new empty plugin file and follow this chapter's recipes by making a folder called ch2-private-item-text...