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


Widgets have been present in WordPress from the early days of the platform. They allow users to easily populate sidebars or other areas of their website theme with blocks of content that are provided by WordPress itself (post or page data), or by any plugins that have been installed (for example, bug tracking system information). Looking at a WordPress installation, the default set of widgets include the Archives widget, which lists monthly post archives, and the Recent Comments widget, which provides an easy way to display visitor comments stored on your WordPress website.

Following its open design, WordPress provides functions that allow plugin developers to create new widgets that users will be able to add to their page design. This chapter shows how to use the widget class to create a custom widget. It also covers the second type of widget, the dashboard widget, which can be used to display plugin-specific information on the front page of the administrative area.