How do I dynamically auto distill and .eps file to create a .pdf?

I am developing a site where I need to dynamically edit text in an
.eps file.  The problem is that I need to maintain 300 dpi (where as
dynamically creating an html page and converting to .pdf format will
only maintain 72 dpi).  I also need to maintain the drop shadow on the
dynamic text to keep the text constant with the static text on the
page.

I have been told that I can have my server can automatically create a
.eps file that can contain the dynamic text I need and then have the
server automatically distill the file and create a pdf based on that. 
I need to know how to do this.

We have a Linux server and the site is coded in PHP.

http://www.ghostscript.com/ is the key. I used this on a project if
you want a specific example.

I am not sure about your exact needs with respect to the content of
the .eps or the final .pdf file.

But I think, you could use LaTeX to create arbitrary documents
including graphics and text at your choice.

LaTeX files are ascii files, where the text is contained in plain
form. The rest are commands regarding style and inclusion of graphics.

So what you would need is

1) get an understanding for LaTeX 
http://www.latex-project.org/guides/
http://en.wikibooks.org/wiki/LaTeX

2) install tetex on your linux machine, (be sure to have dvips and ps2pdf included)

3) create a template.tex file that matches the general layout (size,
font, graphics) of your wanted look (sorry there is too less info
about your needs) for testing purposes.

4) setup a script that generates a file ready.tex which contains the
variable text at the apprioate places in this template.tex file

5) you need the commands 
latex ready  (gives you a file ready.dvi)
dvips ready  (gives you a file ready.ps)
ps2pdf ready (gives you a file ready.pdf)

You would need to use some parameters to reduze the size of the pdf,
but for this I would need more details about the content of the pdf,
the size and so on.