The link: http://tomcatenv.awardspace.com/ above talks about Tomcat 6
I followed that procedure and whilst I got the test page to render OK it failed to run a slide show script (my primary purpose for getting php to work!).
I found another procedure here:
http://php-java-bridge.sourceforge.net/doc/tomcat6.php
You may find this latter procedure is better (I found it quicker and neater) and best of all I found it ran the slide show script I needed.