This experiment would not have been possible were it not for the efforts of the WordPress Playground, Derick Rethans, developers behind wasm and PHP. It's a public experiment into running multiple PHP versions via WASM to run code examples.
It is heavily based upon WordPress playground patches, php-wasm and Derick's php-wasm-builder.
This also "borrowed" some code for the HTML and JS to run this experiment from PHP.net documentation.
Example #1 Lewis is an idiot and wanted to use PHP.net JS example
Sort of a hello-world example
<?php
echo "Hello World!";
?>
The above example will output:
string(0) Hello World!