In a php file I typically generate links like this:
<a href="admin.php?t=email&id=3">Edit Primary Email</a>
When I look at this in FireFox's "View Source" window, I notice it highlights it in red, and says "& did not start a character reference", which is true, but is this valid for a query string? It still works (and gets rid of the 'error') if I change it to &
; but I'm curious now about the official way it should be (which I think is the first).