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

Creating an administration page menu item in the settings menu

After defining default values for plugin configuration options, the next step is to create a place where users will be able to view and change these values. By using the WordPress API, we are able to create new items in the administration menu that will later allow us to create custom plugin configuration pages. This recipe shows how to create a new menu item that will appear under the Settings subsection of the administration menu.

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 (Chapter 3/ch2-page-header-output/ch2-page-header-output-v3.php) from the downloaded code bundle. 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...

  1. Navigate to the root directory of your WordPress development installation.
  2. Open the wp-config.php...