(PHP 4 >= 4.3.0, PHP 5, PHP 7)
fdf_get_version — Gets version number for FDF API or file
$fdf_document
] ) : stringReturn the FDF version for the given document, or the toolkit API version number if no parameter is given.
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.