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

Storing user settings using arrays

While the previous recipe worked quite well in creating entries in the site's options table for each individual plugin option, another way to manage user settings is to store them as arrays in the database.

This recipe creates the same option as the previous one, but also adds a second option and uses an array instead of individual options to store them. It also incorporates an upgrade strategy to deal with the creation of additional options as a plugin evolves over time.

Getting ready

You should have already followed the recipe entitled Inserting link statistics tracking code in page body using plugin filters in Chapter 2, Plugin Framework Basics, to have a starting point for this recipe. Alternatively, you can get the resulting code (Chapter 2/ch2-page-header-output/ch2-page-header-output-v2.php) from the code bundle downloaded from the Packt website ( and rename the file ch2-page-header-output.php.

How to do it...

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