WordPress Plugin Development Cookbook

Create plugins for WordPress through detailed recipes that cover the creation of shortcodes, custom post types, and custom blocks, integrate data from external sources, and do much more with this recipe-based guide

Key Features

• Create plugins that change and extend WordPress to perform virtually any task
• Extend the WordPress Block Editor (Gutenberg) and other components with the help of detailed examples and explanations
• Customize WordPress to meet your project's needs and create plugins that benefit the entire community

Book Description

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.

What you will learn

• Discover action and filter hooks, which form the basis of plugin creation
• Explore the creation of administration pages and add new content management sections through custom post types and custom fields
• Add new components to the block editor library
• Fetch, cache, and regularly update data from external sources
• Bring in external data sources to enhance your content
• Make your pages dynamic by using JavaScript, jQuery, and AJAX and adding new widgets to the platform
• Add support for plugin translation and distributing your work to the WordPress community

Who this book is for

This book is for WordPress users, developers, and site integrators interested in creating new plugins to address their personal needs, fulfill client requirements, and bring new capabilities to the WordPress community. Basic knowledge of PHP and WordPress is expected.

Table of Contents

1. Preparing a Local Development Environment
2. Plugin Framework Basics
3. User Settings and Administration Pages
4. The Power of Custom Post Types
5. Customizing Post and Page Editors
6. Extending the Block Editor
7. Accepting User Content Submissions
8. Customizing User Data
9. Leveraging JavaScript, jQuery, and AJAX Scripts
10. Adding New Widgets to the WordPress Library
11. Fetching, Caching, and Regularly Updating External Site Data
12. Enabling Plugin Internationalization
13. Distributing Your Plugin on WordPress.org

Yannick Lefebvre is a plugin developer who has created multiple plugins on the official WordPress repository. His first creation, Link Library, is used on thousands of sites worldwide. With a background in computer science, he wrote his first plugin in 2004 and quickly started sharing his creations with the community. He is actively involved in the Montreal WordPress community, has presented multiple times at WordCamp Montreal, and offers custom plugin development services. By day, Yannick works for CM Labs Simulations, a company providing software tools and simulators for vehicles and heavy equipment.