Apache CONF:如何在不显示源位置的情况下添加外部目录

I'm having a real brain fart right now, and forgot whats required in httpd.conf to include files from directories outside the web root folder. The whole idea is that I can call files from other folders, without listing the location in the HTML/PHP source files.

Having a hard time searching through google and apache's site, could someone refresh my memory?

EDIT: Example, I'm using 'require_once "pdo-db-conn.php";' in a PHP file, but php-db-conn.php is actually outside the web root. The idea is that I don't need to list the external directory within my production php source code.

I've done it before, and it included listing directories which apache would search for files.

For Apache, you are looking for either Alias or AliasMatch.

For PHP, you are looking for include_path