( int compression [, string filename])
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. If it is omitted the document
is created in memory and can either be written into a file with
the cpdf_save_to_file() or written to standard
output with cpdf_output_buffer().
The return value will be needed in further versions of ClibPDF
as the first parameter in all other functions which are writing
to the pdf document.
The ClibPDF library takes the filename "-" as a synonym for
stdout. If PHP is compiled as an apache module this will not
work because the way ClibPDF outputs to stdout does not work
with apache. You can solve this problem by skipping the
filename and using cpdf_output_buffer() to
output the pdf document.
See also cpdf_close() and