Ovrimos SQL Server, is a client/server, transactional RDBMS combined with Web capabilities and fast transactions.
Ovrimos SQL Server is available at http://www.ovrimos.com/. You'll need to install the sqlcli library available in the Ovrimos SQL Server distribution.
To enable Ovrimos support in PHP just compile PHP with the --with-ovrimos parameter to configure script.
Example 1. Connect to Ovrimos SQL Server and select from a system table