php-ews class library always returns null

I am trying to make SOAP calls to our Exchange server using the classes I found here:

http://code.google.com/p/php-ews/

I have coded up a few examples, starting with the basic example as below and no matter what I try and do this always returns null.

$ews = new ExchangeWebServices('exchange.example.com', 'user', 'password');

$request = new EWSType_FindFolderType();
$request->Traversal = EWSType_FolderQueryTraversalType::SHALLOW;
$request->FolderShape = new EWSType_FolderResponseShapeType();
$request->FolderShape->BaseShape = EWSType_DefaultShapeNamesType::ALL_PROPERTIES;

$request->IndexedPageFolderView = new EWSType_IndexedPageViewType();
$request->IndexedPageFolderView->BasePoint = 'Beginning';
$request->IndexedPageFolderView->Offset = 0;

$request->ParentFolderIds = new EWSType_NonEmptyArrayOfBaseFolderIdsType();
$request->ParentFolderIds->DistinguishedFolderId = new EWSType_DistinguishedFolderIdType();
$request->ParentFolderIds->DistinguishedFolderId->Id = EWSType_DistinguishedFolderIdNameType::INBOX;

$response = $ews->FindFolder($request);
var_dump($response);

H开发者_JAVA技巧as anyone else encountered this error, or can maybe shed some light on it for me?

Your request looks fine, it should work. Did you set up services.wsdl with your EWS server address? (see http://ewswrapper.lafiel.net/basic-info/working-with-ewswrapper/ for some more info)

Try looking at the actual call before it is send and the response before it is interpreted. To do so in NTMLSoapClinet.php print $request at the top of __doRequest() function and end script execution (ie. die()) and then try printing $response befor it is returned in __doRequest() function and end script execution. This should give you some more insight on what's going on.