(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVNf)
fdf_header — Sets FDF-specific output headers
   This is a convenience function to set appropriate HTTP headers for FDF
   output. It sets the Content-type: to 
   application/vnd.fdf.
  
This function has no parameters.
No value is returned.
