Both Christopher Jones and Alison Holloway have pointed out some new PHP RPMs for Oracle with improved PDO_OCI and OCI8 functionality.
Good news everyone. We've just released a set of RPMs for PHP which include OCI8 and the Oracle PDO driver, as well as many other PHP extensions. These are for development testing only, as Oracle doesn't support them. The RPMs are based on PHP 5.2.3.
You can grab these latest RPMs from the oss.oracle.com website and to install them, follow the steps outlined on Alison's blog.