In addition to the Apache Tuscany projects which provide implementations of SDO and SCA for Java and for C++, there is an open source implementation of SDO for PHP hosted on the PECL site at http://pecl.php.net/package/sdo .

There is an overview of SDO for PHP at http://www.zend.com/pecl/tutorials/sdo.php and you can find full documentation in the PHP Manual at http://php.net/manual/en/ref.sdo.php .