Navigating through the commits and files will help you build:
PHP 7.2 is no longer maintained, but you can checkout the v3.x
tags.
PHP 7.1 is no longer maintained, but you can checkout the v2.x
tags.
PHP 5.6+ is no longer maintained, but you can checkout the v1.x
tags.
$ composer create-project minishlink/web-push-php-example
$ cd web-push-php-example
You can change the VAPID keys in the keys folder with this guide. Don't forget to update the public key in app.js too.
$ php -S localhost:8000 router.php
And open localhost:8000.