I've downloaded your files into a directory meetupapi, and set up my auth key in the config file.
I try out the following basic script
getMembers( array( 'group_urlname' => 'Holistic-Media-network','format'=>'xml'));
print_r($members);
?>
..and i just get the request key being displayed in the browser but not executed.
https://api.meetup.com/2/members?key=1234567zxzxzxzxzxzxzxzx&group_urlname=Holistic-Media-network&format=xml
(I've replaced my key here with a dummy string 1234567zxzxzxzxzxzxzxzx)
Why am i not getting an xml file returned? If I enter the URL into the address bar, the XML file I'm looking for is returned.
With hope,
Jazz Rasool