Please correct me if I am wrong, but as far as I remember the combination of PHP and sqlite fails fairly quickly when if comes to concurrent users?

Don't get me wrong, I am very fond of sqlite, but to use it efficiently you have to manage the connections to the database and from what I have heard, that doesn't work particularly well with PHP.

This doesn't mean that the above recommendation is wrong (in fact, I used similar approaches in the past), I just thought that it should be mentioned and if someone wants to build something that has a lot of concurrent users by design, he knows which part will be the first bottle neck.