Returns and optionally sets the filename for a system item (module,
theme, etc.). The filename, whether provided, cached, or retrieved
from the database, is only returned if the file exists.
Returns an array of files objects of the given type from the site-wide
directory (i.e. modules/), the all-sites directory (i.e.
sites/all/modules/), the profiles directory, and site-specific directory
(i.e. sites/somesite/modules/). The returned array…
The Drupal installation happens in a series of steps. We begin by verifying
that the current environment meets our minimum requirements. We then go
on to verify that settings.php is properly configured. From there we
connect to the configured database…