variant com_get_active_object(string $progid[, int $code_page])
Using com_get_active_object() in a web server context is not always a smart idea. Most COM/OLE applications are not designed to handle more than one client concurrently, even (or especially!) Microsoft Office. You should read » Considerations for Server-Side Automation of Office for more information on the general issues involved.
com_get_active_object() is similar to creating a new instance of a COM object, except that it will only return an object to your script if the object is already running. OLE applications use something known as the "Running Object Table" to allow well-known applications to be launched only once; this function exposes the COM library function GetActiveObject() to get a handle on a running instance.
If the requested object is running, it will be returned to your script just like any other COM object.
- string $progid:
progidmust be either the ProgID or CLSID for the object that you want to access (for example Word.Application).
- int $code_page: Acts in precisely the same way that it does for the COM class.