(PHP 4, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_get_file — Get the value of the /F key
fdf_get_file ( resource $fdf_document ) : string
Gets the value of the /F
key.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
Returns the key value, as a string.
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https://www.php.net/manual/en/function.fdf-get-file.php