(PHP 4, PHP 5, PHP 7) Close an FDF document void

(PHP 4, PHP 5, PHP 7) Open a FDF document resource

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

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Return error code for last fdf operation

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Sets a submit form action of a field