Book Image

WordPress Plugin Development Cookbook - Third Edition

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook - Third Edition

By: Yannick Lefebvre

Overview of this book

WordPress is one of the most widely used, powerful, and open content management systems (CMSs). Whether you're a site owner trying to find the right extension, a developer who wants to contribute to the community, or a website developer working to fulfill a client's needs, learning how to extend WordPress' capabilities will help you to unleash its full potential. This book will help you become familiar with API functions to create secure plugins with easy-to-use administration interfaces. This third edition contains new recipes and up-to-date code samples, including new chapters on creating custom blocks for the block editor and integrating data from external sources. From one chapter to the next, you’ll learn 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, followed by recipes covering how to design administration panels, enhance the post editor with custom fields, store custom data, and even create custom blocks. You'll safely incorporate dynamic elements into web pages using scripting languages, learn how to integrate data from external sources, 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 (15 chapters)

Processing and storing custom user data

As user profiles are created or updated, WordPress offers an easy way to register a callback to save custom user data in the site's database.

Getting ready

You should have already followed the Adding custom fields to the user editor recipe to have a starting point for this recipe. The resulting plugin should still be active on your development site. Alternatively, you can get the resulting code directory (ch8/ch2-private-item-text/*) from the book's GitHub page and rename ch2-private-item-text-v3.php to ch2-private-item-text.php. All other .php files can be deleted to avoid confusion when activating the plugin.

How to do it...

Follow these steps to register an action hook to save custom user data:

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