(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets version number for FDF API or file

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Returns the FDF document as a string

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Sets an javascript action of a field

(PHP 4, PHP 5, PHP 7) Create a new FDF document

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Read a FDF document from a string

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Get the value of the /Encoding key

(PHP 4, PHP 5, PHP 7) Get the next field name

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Sets target frame for form

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Return error description for FDF error code

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Sets an option of a field