(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_set_version — Sets version number for a FDF file
fdf_set_version ( resource $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_document
The 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.
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.fdf-set-version.php