Probably. I'm a pretty poor developer. I'm a sysadmin who sometimes writes PHP apps for work. So, I'll look into PDO. :D
generalpf: I will do so! Do you have any go-to references that you prefer? Or shall I just dig through the PHP docs?
I think that for a comment at some level of nesting N, the ability to replay is delayed by Y seconds. IIRC this is to prevent stupid back-and-forth arguments.