I'm trying to include zenphoto template functions in an external website, like described here:

http://www.zenphoto.org/2008/01/hacks/#zenphoto-as-plugin

Zenphoto ends up throwing this error at me:

Zenphoto Error
MySQL Error: Zenphoto could not connect to the database server. Check your zp-config.php file for the correct host, user name, and password. Note that you may need to change the host from localhost if your web server uses a separate MySQL server, which is common in large shared hosting environments like Dreamhost and GoDaddy. Also make sure the server is running, if you control it.
Backtrace:

in db_connect (functions-db.php [64])
in query (functions-db.php [120])
in query_full_array (functions.php [104])
in getoption (functions.php [41])
in require_once (functions-db.php [5])
in require_once (auth_zp.php [3])
in require_once (classes.php [6])
in require_once (template-functions.php [10])
in require_once (header.php [45])
in require_once (theme.php [472])
in load_template (general-template.php [8])
in get_header (page.php [1])
in include (template-loader.php [34])
in require_once (wp-blog-header.php [20])
in require (index.php [4])

The exact syntax I'm using is this:

define('ZENFOLDER', 'zp-core');
define('WEBPATH', '/home/petruzzo/public_html/staging/zp/');
require_once(WEBPATH . "/" . ZENFOLDER . "/template-functions.php");

I've already checked the config file for zenphoto and I know the information is correct. Plus, the installation of zenphoto works fine on its own. For what it's worth, I'm attempting to run the include on a wordpress site. Both the wordpress site and zenphoto site are in the same database.

Anyone know what's going on here?

Have you tried this outside of the wordprss site? Just want to know if it is a generic problem or an interaction with wordpress.

Well, I wasn't able to get it to work precisely, but it did do better outside wordpress. So I guess either way, wordpress is somehow causing problems.