(3.0.8 - 3.0.18 only, PHP 4 >= 4.0.0)
void cpdf_save_to_file (int pdf document, string filename)
The cpdf_save_to_file() function outputs
the pdf document into a file if it has been created in memory.
This function is not needed if the pdf document has been open
by specifying a filename as a parameter of cpdf_open().
See also cpdf_output_buffer(),