I have websites hosted on 1and1 and the servers default to PHP 4 and if you want PHP 5 or 6 you add "AddType x-mapp-php5(or 6) .php" and it'll run the scripts as PHP 5 or 6.
There isn't a lot of information out there about how such a system is setup, I've contact 1and1 support asking to talk to a tech but I've little hope they'll give me any info about how this work.
I have a ubuntu server in my basement running mysql/apache that I can use a dev box but half my apps are php4 and half are php5 currently the only way to work things is to uninstall one, and reinstall the other to get php4/5 use.
Does anyone have any idea how to setup "AddType x-mapp-php5 .php" capability so i don't have to keep uninstall/installing php over and over again?