How do I add text to an existing pdf file using php?

[Little Princess]

I have a pdf file that someone else created. It's not copy protected or privileged or anything like that (it's actually a government form). I want to set up a web page where I get info from the user and based on that info, I add various text fields to the pdf file. The pdf file is two pages and all the text I'll be adding will be to the first page.

I've looked at the pdf file and it's not decipherable by human eyes. I've used acrobat to add typewriter text but the stuff it added to the file is also not decipherable by human eyes.

Is there an existing library (or something) that will allow me to open up an existing pdf file (on my webserver), add displayable text to it, then push the resulting pdf file to the user?

[annyphp]

Hi,
Free and open source PHP PDF Projects. It allow you generate PDF file and manipulate PDF file.
Recommended:Fpdf 1.6