jjatcal,
You said:
"Do you mean I don't need to create an HTML document (with forms) if I have a PDF forms document?"
Answer: exactly so.
"If so, how do I "host" my PDF on the web server so users can go to it and fill it out???"
The same way you do any HTML page or document of any type! You put the PDF in a directory that maps to a web server URL. Exactly the same as HTML. The only additional step you might need to make, depending on your web server, is to map the PDF extension to MIME type "application/pdf".
As to ASP, PHP, whatever... it does not matter in the least. If you set the PDF form Export Format to HTML, that's what your web server program will see: a regular HTTP Post.
I don't program in PHP, but I believe it references HTML Form variables by prefacing their name with a dollar sign, right?
So if in your HTML Form (or PDF Form with Export Format set to HTML), you have a field named "myTextField", then in the PHP program to which the form is submitted, you would retrieve the value of that field with "$myTextField".
The key point is that your PHP program doesn't need to know anything about PDF or FDF... it's just processing a good old fashioned HTML Form.
Thomas D. Greer
Providing PostScript & PDF
Training, Development & Consulting