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)

Accessing user settings from action and filter hooks

After creating a default set of values for our plugin's configuration and creating an interface to allow users to modify and update those values, we are now ready to start using these options when pages are rendered using our additional plugin functionality. Going back to the Google Analytics example created in Chapter 2, Plugin Framework Basics, this recipe shows how to access the plugin options data using a familiar function to make the existing code much more flexible.

Getting ready

You should have already followed the Adding custom help pages recipe, and the resulting plugin should be active on your development site. Alternatively, you can get the resulting code (ch3/ch2-page-header-output/ch2-page-header-output-v8.php) from the book's GitHub page. You should rename the ch2-page-header-output-v8.php file as ch2-page-header-output.php before starting this recipe.

How to do it...

Follow these steps to learn...