(PHP 4 >= 4.3.0, PHP 5)
fdf_set_version — Sets version number for a FDF file
Sets the FDF version for the given document.
Some features supported by this extension are only available in newer FDF versions.
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
The version number. For the current FDF toolkit 5.0, this may be either 1.2, 1.3 or 1.4.
如果成功则返回 TRUE,失败则返回 FALSE。