Question about syntax
I know the difference is that the PHP delimiters are interpreted at the server rather than the client, but it wouldn't be too hard to write support for the <?X ?> thing into clients! One could then argue that you could use this style for all tags - or even reduce HTML to something that looks like LISP in order to reduce code size and therefore bandwidth - but that's straying into the realm of syntax debate ... (and I happen to like LISP so I'm biased!).
Die Welt ist ein Irrenhaus und hier ist die Zentrale!