new php script and sqlite

Hi, I'm currently using a text file to store data which the php script will read and write back to. I've a few questions: 1) I'm thinking of using sqlite, but not sure whether this will be widely available on most hosts, as I intend for the php script to be deployed without needing to much with much configuration. Is sqlite included with most php setups? 2) Should I be using sqlite 2 or 3? Thanks for your time! Regards. Eric