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

Displaying new user data in user list page

As new fields are added to user profiles, it can be very useful for site administrators to see this data in the site user list and be able to filter users to see only the ones that were assigned certain values. This recipe shows how to add extra columns to the user listing of the WordPress administration area and how to add a filter function to reduce the number of records shown.

Getting ready

You should have already followed the Processing and storing user custom data 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 7/ch2-private-item-text/ch2-private-item-text-v4.php) from the downloaded code bundle, renaming it ch2-private-item-text.php.

How to do it...

  1. Navigate to the ch2-private-item-text folder of the WordPress plugin directory of your development installation.
  2. Open the ch2-private-item-text.php file in a text editor.
  3. Add...