replace client-side maxi with php smart client in EC2 and still get fault tolerant

With unpredictability of ip in EC2, dns name seems to be the best way to set up and id the cluster nodes. With client side maxi, one is able to specify a list of couch base nodes in case of any single node failure (at least that's what the doc stated. I have not tested this). such as

./moxi URI1[,URI2[,...,URI3]]...]

If instead of client-side maxi, I wants to use php smart client, how can I obtain this capability? What I need is for the client to continue to have access to the cluster if one of the node (URI) becomes unavailable. This will also allow me to add new client boxes and know that even if one of the node is down, the client can still reach the cluster thru other nodes.