How do I access the Drupal class from a standalone PHP file?

Question

How do I use the \Drupal class in an standalone PHP file?

Answer 1

You can make use of drush php-script command.

drush scr /path/to/file.php

Answer 2

You can use drush in a shebang, if you have drush installed.

This is an example for a standalone php file, where you can access Drupal classes:

#!/usr/bin/env drush

$sitename = \Drupal::config('system.site')->get('name');

echo "This is the site $sitename\n";

See http://www.drush.org/en/master/shellscripts/

Answer 3

Since most of the drupal core components are composer packages you can load them quite easily using composer:

composer require drupal/component_name

You just need to require the composer's autoloader into your PHP script and you can quite easily use these classes in your own scripts.