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

Loading a language file in the plugin initialization

The final step to plugin translation is to put the code in place to load a translation file. This is done by registering an action hook callback and calling a single function when it gets executed.

This recipe shows how to load the translation file created in the previous recipe.

Getting ready

You should have already followed the Making admin page code ready for translation and Translating text strings using Poedit recipes to have the proper files required for this recipe. Alternatively, you can get the resulting code (Chapter 11/ch11-hello-world/ch11-hello-world-v3.php and Chapter 11/ch11-hello-world/languages folder) for these recipes from the code bundle. You should rename the file ch11-hello-world-v3.php to ch11-hello-world.php and copy the languages folder next to the renamed file before starting the recipe.

How to do it...

  1. Navigate to the ch11-hello-world folder of the WordPress plugin directory of your development installation.
  2. Open the...