Form PDF: Create and load PDF forms in FDF format

This class can be used to create and load PDF forms in FDF format using only pure PHP code.

It can generate an FDF document from an associative array of form values. The generated document can be saved to a file.

The class can also do the opposite, i.e. extract form values into an associative arrat from FDF files.

It can also convert an FDF file to a PDF file using the pdftk program.