How to add DB(PDO or SQLite) to my PHP?

Hi, I want to add a simple db to my webserver(aka PHP code), I already tried doing it threw PDO, but it doesn't seems to be working. Can someone explain to me how can I add DB into my php plz?

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@MrVoo, isn't ReplDB only available on (I believe it is.) And that being the case, why would anyone want to use it? I can't speak for anyone else, but using a tool only available in the IDE seems like an extraordinarily bad design to me. Not to mention that ReplDB is not a SQL engine.