No probs about the quick reply, just slackin off at work 😉
Now, about the question. Even if it was possible to do what you're asking, (which I don't think it is), that would make it extrememly difficult for the user 😉 The browser still needs html to interpret. When a PHP script is served from a web server, the php is all interpreted on the server, and then output, using HTML, (or xml, or any other interpreted scripting language really), to the browser, which in turn interprets what it has recieved. The users never actually see the php code, only the results of the script.
🙂