Is this possible?

I would like to have multiple domains and have them forwarded to different folders, so I'd only need one hosting account. Example: www.domain1.com goes to www.domain.com/domain1 www.domain2.com goes to www.domain.com/domain2 I would like to do this in php. Of course, to do this, I'd need to get the url the user is requesting into the script. If this possible? Thanks in advance, Leif K-Brooks.