(PHP 4, PHP 5)
fdf_save — Save a FDF document
Saves a FDF document.
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
If provided, the resulting FDF will be written in this parameter. Otherwise, this function will write the FDF to the default PHP output stream.
如果成功则返回 TRUE，失败则返回 FALSE。