In this new entry to his Oracle blog Chris Jones explains some of the prompts you're given when you go to install the latest OCI8 drivers for PHP.

There's two versions - the short one that runs through a basic install, grabbing the package and change up your config and the other that talks about how to pull down and configure a certain version of the need comes up.

You can find out more about this updated package on its PECL page and the Changelog for anything more specific.