(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_get_version — Gets version number for FDF API or file
fdf_get_version ([ resource $fdf_document ] ) : string
Return the FDF version for the given document, or the toolkit API version number if no parameter is given.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
Returns the version as a string. For the current FDF toolkit 5.0 the API version number is 5.0 and the document version number is either 1.2, 1.3 or 1.4.
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https://www.php.net/manual/en/function.fdf-get-version.php