fdf_set_version Sets version number for a FDF file stringfdf_set_version resourcefdf_document stringversion This function will set the fdf version for the given fdf_document. Some features supported by this extension are only available in newer fdf versions. For the current FDF toolkit 5.0 version may be either '1.2', '1.3' or '1.4'. See also fdf_get_version.