I don't know why you'd want to do this. It's much easier and more secure (I know it's internal-only) to adjust the permissions on the files that 'need root access' so that Apache can read them.
You need to edit /etc/httpd/conf/httpd.conf and change the 'User apache' and/or 'Group apache' lines to run apache as an alternate user.
For more information, read the documentation available at
http://httpd.apache.org/docs-project/