Global variables are a concept in PHP that allow you to access these variables from any scope during a page request. WordPress ships with a specific set of global variables, and it's useful to know what they are, and how to use them correctly. In this session you'll learn how global variables work, the list of global variables available in a typical WordPress request, and now to correctly use and interact with them.

1. 1
Common WordPress APIs:
Global Variables
Jonathan Bossenger
Learn.WordPress.org

2. 2
👋🏽 Welcome!
As you join, let everyone know in the chat where you’re
joining us from…
Hello!
○ My name is Jonathan Bossenger
○ From Cape Town, South Africa
○ Developer educator at Automattic
○ Sponsored to work with the Training Team
○ jonathanbossenger.com

3. Learn.WordPress.org
Global Variables
Jonathan Bossenger

4. Announcements
○ Welcome.
○ Please let me know if you can’t see this slide!
○ We are presenting in focus mode, but please feel free to enable your video.
○ You are welcome to ask questions.
○ You are welcome to post questions in the chat, or unmute to ask questions.

5. Announcements
○ Make sure your local install is ready
○ If I am going too fast, please let me know!
○ We will be posting this session to https://wordpress.tv/ afterwards.
○ For WordPress tutorials and courses please visit https://learn.wordpress.org/
○ For WordPress developer news and updates please visit
https://developer.wordpress.org/news/

6. Learning outcomes
○ What are global variables in PHP?
○ How to define global variables to use them?
○ Why global variables are considered bad?
○ What global variables are available in WordPress?
○ How to interact with WordPress global variables?

7. Question time
○ On a scale of 1 to 5, how well do you know this topic?

8. Requirements
○ A default local WordPress install
○ A text editor
○ At least one active theme and plugin
• I’ll be using Twenty Twenty-Three and Create Block Theme

9. Let’s go!

10. Resources
○ https://www.php.net/manual/en/language.variables.scope.php
○ https://developer.wordpress.org/apis/global-variables/