Is this a bug in PHP

Hi, Can anyone tell me if the following is a bug in php or a coding error on my part. When I run the following piece of code I get an error: Code: $empty = new VARIANT(); $word = new COM("word.application") or die("Unable to instantiate Word"); $word->Visible = 1; $word->Documents->Add(); $word->ActiveDocument->MailMerge->MainDocumentType = wdFormLetters; $word->ActiveDocument->MailMerge->OpenDataSource ("c:\\temp\\test.xls",$empty,$empty,$empty,$empty,$empty,$empty,$empty,$empt y,$empty,$empty,$empty,"SELECT * FROM test$",$empty,$empty,$empty); Error: Warning: (null)(): Invoke() failed: Type mismatch. Argument: 17 in c:\program files\apache group\apache\htdocs\test6.php on line 93 I didn't think I had specified 17 arguments in the call to OpenDataSource. I have checked what data types OpenDataSource is expecting and according to OLE/COM viewer, it is expecting a BSTR followed by 15 optional variants. If someone could let me know if its me before I report it as a bug that would be good. Thanks in advance Dave