The wonderful non-intuitive php include statement

Ok .. I have some classes set up to do some database queries and what
not. The database configuration is an XML file. Now I need to include
this class in a few pages, in different directories. Here is an
example of the class.

class foo {
private $xml;

function foo() {
$this->xml = simplexml_load_file('config/dbconfig.xml);
}

public function dbStuff() {
//do some db stuff
}

etc......
}


I am using apache which has php set up as a module. This class (which
resides 2 directories deep e.g htdocs/classes/foo) works fine in
main.php which resides in htdocs. But if I include this class in
another php file which is in a different directory .... say htdocs/
forums I get this type of error:

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O
warning : failed to load external entity "config/dbconfig.xml"

I tried using set_include_path(), which I could not get to work right,
and I also tried to set 'include_path' in php.ini which also did not
work. PHP include seems to work very non-intuitive which is driving me
nuts. They really need to implement this a little better. I really
don't see why the simplexml_load_file works in htdocs/classes/foo and
not htdocs/forums.

.

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