Setting up a staging server with apache

[John Steel <john.steel@xxxxxxxxxxxxxxx>]

I'm new to PHP but not J2EE. In J2EE you can set the container to 
resolve separate apps based off their hostname as long as you set them 
up as web-apps in the config.
So for example, you can on a single PC visit 
http://localhost:8080/www.example1.com and 
http://localhost:8080/www.example2.com. What you are really doing is 
just qualifying 1 host having multiple web-apps. Its useful because you 
can expose this PC to the web as a staging server, and outside users can 
see them by using URL's like 
http://staging.example.com:8080/www.example1.com and 
http://staging.example.com:8080/www.example2.com. This is all handled 
entirely by the J2EE server. When you want to populate production 
machines you copy the staging content to live, where the real URL is 
mapped appropriately.

I am trying to reproduce this setup for PHP development which will 
manage separate hosts running separate apps (Drupal, MediaWiki, etc).
If I try to use Apache VirtualHosts I get stuck - I know I could set up 
www.example1.com and www.example2.com as separate entries but that means 
messing externally with with the IP addresses/hostnames. Is this 
possible with a rewrite rule? I.e., if you see 
http://localhost:8010/{$hostname} you really mean ServerName={$hostname} 
in httpd.conf?
Any smarter solutions very welcome, thanks.

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