Round Robin Load Balanced PHP ADODB class

Attached is a Word document with a simple ADODB ([login to view URL]) wrapper class to load balance MYSQL between a read replica and a master read / write instance. We need this class expanded so that asimple round-robin load balancing across the read replicas occurs. The Word document also gives an example of a round robin PHP class that may be of use. Code should work on PHP 5.3 and latest ADODB [login to view URL]