Addition to BBCODE

I think adding php bbcode tags (simalar to those found in vBulletin) is a good idea. For example:

[PHP]
<?php
echo "This is example code, no real functionility";
?>
[/PHP]

This is easy to implement because PHP comes with all needed functions (and pun bb is written in PHP). It just makes PHP code much easier to read and better looking. Obviously not a absolute critical feature but a useful one all the same.