A: 

edit: there is a discussion on the topic here:

http://www.apachefriends.org/f/viewtopic.php?f=16&t=34389&sid=c99e3edebef9f297aff3f2f179c50ccc&p=141255

Silfverstrom
I'll read the whole topic later! Thanks!!
Keira Nighly
+3  A: 

I think that the PDO driver for sqlite3 is called 'sqlite', so you already have it installed. The sqlite2 driver is older.

PDO_SQLITE is a driver that implements the PHP Data Objects (PDO) interface to enable access to SQLite 3 databases.

In PHP 5.1, the SQLite extension also provides a driver for SQLite 2 databases; while it is not technically a part of the PDO_SQLITE driver, it behaves similarly, so it is documented alongside it. The SQLite 2 driver for PDO is provided primarily to make it easier to import legacy SQLite 2 database files into an application that uses the faster, more efficient SQLite 3 driver. As a result, the SQLite 2 driver is not as feature-rich as the SQLite 3 driver.

From http://php.net/manual/en/ref.pdo-sqlite.php

Tom Haigh
Oh okay! Thanks!
Keira Nighly