pdf_open

how can i open an existing pdf document??

cpdf_open: manual
The cpdf_open() function opens a NEW pdf document. The first parameter
turns document compression on if it is unequal to 0. The second optional
parameter sets the file in which the document is WRITTEN...

pdf_open_file ( resource pdfdoc, string filename): manual
Create a NEW PDF file using the supplied file name.


:-((((

You can create a PDF document, but there is no way to re-open it!!

HELP me please