Alot of people share the same kind of problems getting this setup on linux.  I was assigned this problem 2 days ago and I was successful.  My combination was PHP4 RC2, Easysoft OOB, and unixODBC.  These three products work very well together and are real easy to install.  More info http://www.easysoft.com/products/oob/main.phtml. ps also works good with Perl's DBI.