@NogDogAug 16.2008 — #Search engines access your site via HTTP requests just like browsers do, so they see just what a browser would see: the [X]HTML output of the page, not the PHP source code.
@NogDogAug 17.2008 — #No, I'm saying the opposite. They will see the exact same thing your browser sees. If you do a "view source" from your browser after loading your PHP page and you see the meta tag, then the search engines will see it, too. [list=1]
[*]browser OR search engine requests PHP page via HTTP
[*]server interprets HTTP request and invokes PHP parser for selected PHP file
[*]PHP processes PHP file, sending all standard output back to the web server
[*]Web server sends the output back to the client (browser or search engine)
[*]client reads that output and does whatever it wants to with it