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)

Creating a new WordPress REST endpoint

The REST API is an interface that allows application developers to exchange data with the core of a WordPress site. This API can be used for anything, from developing a mobile application that displays WordPress pages or custom post types to creating a complete replacement interface for content creation.

The new WordPress block editor was built using the REST API to interact with the rest of WordPress. As such, plugins occasionally need to extend the REST API to be able to implement new endpoints. This allows custom block JavaScript code to get access to data that is not part of the default WordPress REST API.

Getting ready

You should have already followed the Managing multiple sets of user settings from a single admin page recipe in Chapter 3, User Settings and Administration Pages, 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...