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

If the above explained example doesn't work try this:

$path = $_SERVER['DOCUMENT_ROOT'];
chdir($path."/drupal");
define('DRUPAL_ROOT', getcwd()); //the most important line
require_once './includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);