(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_set_version — Sets version number for a FDF file
$fdf_document, string $version): bool
Sets the FDF version for the given document.
Some features supported by this extension are only available in newer FDF versions.
fdf_documentThe FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
version
The version number. For the current FDF toolkit 5.0, this may be
either 1.2, 1.3 or
1.4.
成功时返回 true， 或者在失败时返回 false。