(OT) Anyone got PHP5 installed?

[Donn]

Hi, a little off topic...

I see PHP5 is available (I'm assuming it's on the backports repo).
Wondering if I can just "aptitude install php5" or if I must worry about 
php4 ? I don't want to break php4 but at the same time I need to move on to 
php5.

If they both live together, how does one tell apache to use one and not the 
other?

Please kick my lazy butt off to a better list if asking this here is not 
kosher. :)

/d