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WordPress Playground and PHP WASM (WebAssembly)

Project Page | Live demo | Documentation and API Reference

WordPress Playground is an experimental in-browser WordPress that runs without a PHP server thanks to the magic of WebAssembly.

Why is WordPress Playground useful?

WordPress Playground exists to make WordPress instantly accessible for users, learners, extenders, and contributors by building foundational software tools developers can use to create interactive, zero-setup, JavaScript applications with WordPress.

Playground aims to facilitate:

– Learning WordPress Through Exploration – Learning WordPress Development Through Writing Code – Instant access to WordPress ecosystem

Learn more about the vision and the roadmap.

Getting started

WordPress Playground has a live demo available.

You can embed WordPress Playground in your project via an <iframe> – find out how in the documentation. Note the embed is experimental and may break or change without a warning.

You can connect to the Playground using the JavaScript client. Here's an example of how to do it in the browser using an iframe HTML element and the startPlaygroundWeb function from the @wp-playground/client package.

index.html:

<!DOCTYPE html>
<iframe id="wp-playground" style="width: 1200px; height: 800px"></iframe>
<script type="module">
	import { startPlaygroundWeb } from 'https://unpkg.com/@wp-playground/client/index.js';

	const client = await startPlaygroundWeb({
		iframe: document.getElementById('wp-playground'),
		remoteUrl: `https://playground.wordpress.net/remote.html`,
		blueprint: {
			landingPage: '/wp-admin/',
			preferredVersions: {
				php: '8.0',
				wp: 'latest',
			},
			steps: [
				{
					step: 'login',
					username: 'admin',
					password: 'password',
				},
				{
					step: 'installPlugin',
					pluginZipFile: {
						resource: 'wordpress.org/plugins',
						slug: 'friends',
					},
				},
			],
		},
	});

	const response = await client.run({
		// wp-load.php is only required if you want to interact with WordPress.
		code: '<?php require_once "/wordpress/wp-load.php"; $posts = get_posts(); echo "Post Title: " . $posts[0]->post_title;',
	});
	console.log(response.text);
</script>

WordPress Playground Tools

WordPress Playground Tools are independent applications built on top of WordPress Playground. They are located in a different repository: WordPress/playground-tools.

These tools include:

Cloning WordPress Playground repo

The vanilla git clone command will take ages. Here's a faster alternative that will only pull the latest revision of the trunk branch:

git clone -b trunk --single-branch --depth 1 git@github.com:WordPress/wordpress-playground.git

Running WordPress Playground locally

You also can run WordPress Playground locally as follows:

git clone -b trunk --single-branch --depth 1 git@github.com:WordPress/wordpress-playground.git
cd wordpress-playground
npm install
npm run dev

A browser should open and take you to your very own client-side WordPress at http://127.0.0.1:5400/!

Any changes you make to .ts files will be live-reloaded. Changes to Dockerfile require a full rebuild.

From here, the documentation will help you learn how WordPress Playground works and how to use it to build amazing things!

And here's a few more interesting CLI commands, which expect that you have nx installed globally:

# Build and run PHP.wasm CLI
nx start php-wasm-cli

# Build latest WordPress releases
nx recompile-wordpress:all playground-remote

# Recompile PHP 5.6 - 8.2 releases to .wasm for web
nx recompile-php:all php-wasm-web

# Recompile PHP 5.6 - 8.2 releases to .wasm for node
nx recompile-php:all php-wasm-node

# Builds the documentation site
nx build docs-site

# Builds the Playground Client npm package
nx build playground-client

# Bonus: Run PHP.wasm in your local CLI:
npx @php-wasm/cli -v
PHP=7.4 npx @php-wasm/cli -v
npx @php-wasm/cli phpcbf

How can I contribute?

WordPress Playground is an open-source project and welcomes all contributors from code to design, and from documentation to triage. If the feature you need is missing, you are more than welcome to start a discussion, open an issue, and even propose a Pull Request to implement it.

Here's a few quickstart guides to get you started:

WordCamp Contributor Day

If you're participating in a WordCamp Contributor Day, you can use the following instructions to get started: WordCamp Contributor Day.

Backwards compatibility

This experimental software may break or change without a warning. Releasing a stable API is an important future milestone that will be reached once the codebase is mature enough.

Prior art

WordPress Playground forked the original PHP to WebAssembly build published in https://github.com/oraoto/pib and modified later in https://github.com/seanmorris/php-wasm.

Another strong inspiration was the Drupal in the browser demo which proved you can run non-trivial PHP software in the browser.

A worthy mention is Wasm Labs’s closed-source WordPress in the browser shared before this project was first published. There is no public repository available, but their technical overview gives a breakdown of the technical decisions that project took. WordPress Playground draws inspiration from the same PHP in the browser projects and makes similar technical choices.

Governance

WordPress Playground is a WordPress.org project started and maintained by Adam Zielinski. As Adam is on sabbatical until September 26th, Dennis Snell is the current maintainer.

Playground tools like wp-now or the interactive code block are maintained by their authors in the playground-tools monorepo.

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