Zend Server is a complete, Oracle-enabled, enterprise-ready Web application Server for running and managing PHP applications that require a high level of reliability, performance and security. Connectivity to Oracle databases is delivered out of the box. We have a long history of working with Zend and the PHP community to ensure that the latest and greatest Oracle features are available in the PHP database connectivity libraries.
Oracle now hosts an rpm package on their ULN servers called zend-server-repo, which updates yum to also look at the software repositories hosted by Zend. (Note: you may need to use a proxy server to get to it, if you have ULN locally mirrored, or mirror the Zend repo as well!) When a user wants to install Zend Server, just a simple command will install the zend-server product directly.
FYI, the zend rpm is located in the el5_addons channel. For more info and details, read the original article.