fdf_open Open a FDF document resourcefdf_open stringfilename The fdf_open function opens a file with form data. This file must contain the data as returned from a PDF form or created using fdf_create and fdf_save. You can process the results of a PDF form POST request by writing the data received in $HTTP_FDF_DATA to a file and open it using fdf_open. Starting with PHP 4.3 you can also use fdf_open_string which handles temporary file creation and cleanup for you. ]]> See also fdf_open_string, fdf_close, fdf_create and fdf_save.