I just spent a few minutes writing up my experience configuring PHP and CodeIgniter to use an Oracle database, and thought it might be beneficial to the community.
http://www.abbett.org/2007/12/02/using-oracle-with-php-and-codeigniter/
It covers enabling PHP’s Oracle support, configuring CodeIgniter to connect to an Oracle database, and using Active Record against an Oracle database. It might be useful to anyone encountering:
== “Unable to load dynamic library” / php_oci8.dll errors
== “Use of undefined constant OCI_COMMIT_ON_SUCCESS” notices
== ORA-12514 warnings
== ocifetchinto / ociexecute warnings