&reftitle.setup;

&reftitle.required; You need the FDF toolkit SDK available from &spec.pdf.fdf;. As of PHP 4.3.0 you need at least SDK version 5.0. The FDF toolkit library is available in binary form only, platforms supported by Adobe are Win32, Linux, Solaris and AIX.

&reference.fdf.configure;

&reftitle.resources; Most fdf functions require a fdf resource as their first parameter. A fdf resource is a handle to an opened fdf file. fdf resources may be obtained using fdf_create, fdf_open and fdf_open_string.