Server, PHP and MySQL and SQLite setup

[kd4ttc]

Well, more info: SQLite now has a version 3 available that is recommended. That calls for running the PDO module in PHP. I understand that all versions of Apache will support that. SQLite verison 3 is also the standard that Apple uses in the OS.
So, it seems that correct thing is to upgrade PHP on the server to 5.x, leave Apache as is, and implement PDO in PHP. All versions of everything support MySQL.
The feedback I am interested in is whether my analysis is correct, and whether there are any issues on upgrading PHP that would affect the server.
Steve