我的数据库驱动程序类应该支持复制（PHP）吗？

I'm currently writing a PHP application and drivers (classes) for the database engines. I was wondering if I need to write a replication support (master-slave)? I'm a bit new to this, so, what kind of things should my project or classes worry about if I want to support load balancing/replication? Oh and this is about MySQL.I'm currently writing a PHP application and dri