I am currently considering installing a custom PHP with APC. This is something I have no experience doing and I have a few questions. Forgive me if they're silly.
I'm looking at the PHP 5.3 + Xdebug + APC install script. Is this something I can run by itself and get all those things setup, or is there additional steps that need to be taken first?
I'm currently on a free trial for VPS, though I'm considering moving back to shared when it's done since I have not seen any performance increase after the move. I have both mediawiki and an SMF forum installed, and I've been trying to improve their performance.
After installing a custom php, is it automatically set for all of my domains? Or is this something I would have to select under each domain settings? I ask mainly because I want to know if this will do bad things to my currently active websites if something goes wrong during installation.