All the information is on www.php.net/fdf.
I just read the above page and I can't for the life of me figure out why anyone would want to do this. Of course, it's likely that I am simply being myopic. Would anyone who's actually used fdf enlighten as to the need to do it this way?
PDF forms offer a lot more formatting capabilities than HTML forms. This is sometimes needed to exactly reproduce forms for you business (especially with goverment/army forms).
You can also email the forms around easier than an HTML form and the user can't modify it at all.
Finally, you can have the actual form submitted along with the user data (will be present in RAW_POST_DATA, IIRC), so you can save the form along with the data in the database and then present it back to the user whenever you want.
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