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 a client-side content submission form

The first step toward giving visitors the ability to contribute to a website is to present a form that they can use to submit new content. This recipe shows how to create a shortcode that can easily be inserted on any WordPress page to render a simple form.

Getting ready

You should be running the final version of the Chapter 4 - Book Reviews plugin created in Chapter 4, The Power of Custom Post Types. Alternatively, you can download the final resulting code (ch4/ch4-book-reviews/ch4-book-reviews-v12.php) from the book's GitHub page.

How to do it...

Follow these steps to create a new shortcode that displays a simple form:

  1. Navigate to the WordPress plugins directory of your development installation.
  2. Create a new directory called ch7-book-review-user-submission and open it.
  3. Create a text file called ch7-book-review-user-submission.php.
  4. Open the new file in a code editor and add an appropriate header at...