(PHP 4, PHP 5 <= 5.0.5)
cpdf_save_to_file — Writes the pdf document into a file
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().
성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.