I know it is a not everyday issue. But we are trying to access an OCX with php code (not client). The php documentation has a COM object (http://ca3.php.net/manual/en/book.com.php).
Does it work with OCX?
I know that the php server has to be a Windows server.
You should be able to, I have done so in the past (long ago to be honest), works with some, create in the usual way:
$moo = new COM("thing.ocx");
Assuming it's registered and all that usual stuff :)