Using form helper? Is there a way to modify the DOM?

So I figure that I needed to modify the DOM. I found this package which will let me modify the DOM from PHP: PHP Simple HTML DOM Parser. The question is when do I do this? I can load the entire view file into a string, modify it, and then "Dump the internal DOM tree back into a string. If the $filename is set, result string will save to file". I am concerned because this is multi user system. I could surely keep the $string in a session, but how do then get load_view() to display it?

proof that an old dog can learn new tricks