Drupal: how to access to Drupal's APIs with a standalone php script?

Question

When I create a new script in a separate php file to run for Drupal, I need to add the following lines on top in order to access all Drupal APIs:

require_once \'./in

Answer 1

yes, it's one way to enter drupal api.
Sometime chdir("dir to drupal dir"); required, if you call php script from other directory.