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 an administration page menu item in the settings menu

After defining default values for plugin configuration options, the next step to creating a plugin configuration page is to build a place where users will be able to view and change these values. By using the WordPress API, we can create new items in the administration menu that will later allow us to create custom plugin configuration pages.

Getting ready

You should have already followed the Storing user settings using arrays recipe to have options data available to manage. Alternatively, you can get the resulting code (ch3/ch2-page-header-output/ch2-page-header-output-v3.php) from the book's GitHub page. You should rename the file ch2-page-header-output-v3.php as ch2-page-header-output.php before starting this recipe.

How to do it...

Follow these steps to create a new menu item that will appear under the Settings subsection of the administration menu:

  1. Navigate to the root directory of your WordPress...