Calling Drupal functions in external PHP file

Question

How can I call a Drupal function or get the global variable in a PHP file which is located under the drupal installation folder. I doing it for the first time. Are there any

Answer 1

define('DRUPAL_ROOT', getcwd());

require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
global $user;
print_r($user);