Chris Jones has pointed out a new article on the Oracle Technology Network about using PHP on the Oracle HTTP Server for 11g.
Oracle HTTP Server is the web server component in Oracle Fusion Middleware. Based on the Apache infrastructure, Oracle HTTP Server allows developers to program their site in a variety of languages and technologies. [...] Although PHP interpreter, language and server side module (mod_php) do not ship with the Oracle HTTP Server 11g release, Oracle will assists customers in configuration and inclusion of mod_php into Oracle HTTP Server. Note that Oracle does not support the PHP interpreter and language but it supports Oracle HTTP Server 11g release with mod_php included.
The tutorial steps you through the installation of a PHP component on the Oracle HTTP server to get the latest version of the interpreter up and running (PHP 5.3 as of the time of this post). The main part of the install is getting the mod_php extension for the server installed and working with the needed Oracle (OCI8) support. You'll need to be able to configure and make/make install to get it all working so be sure either you have the rights (or a handy admin is nearby).