CORBA for PHP is a PHP Extension to use CORBA objects in PHP5(Zend Engine 2). It uses MICO as its ORB and will also provide an Idl-to-PHP language mapping specification and compiler.
For a PHP4 CORBA support look at the great Universe-phpext.
OpenORM is an OpenSource Object Relational mapping broker based on Scott Ambler whitepapers.
It's developed on C++ and the objects that it persist are CORBA objects.
We are currently using omniORB2 as our ORB and PostgreSQL as our database server.