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)

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.

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 (the ch12/ch12-hello-world/ch12-hello-world-v3.php file and the ch12/ch12-hello-world/languages folder) for these recipes from the book's GitHub page. You should rename the file ch12-hello-world-v3.php to ch12-hello-world.php and copy the languages folder next to the renamed file before starting the recipe.

How to do it...

Follow these steps to load the translation file created in the previous recipe:

  1. Navigate to the ch12-hello-world folder of the WordPress plugin directory...