Yes. The way you do that is the same as for JBoss Web Server.
Here is one post that discusses this
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4146675 (the end result
is the Portal and PHP running on the same app server).
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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4185552#...
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