my son was about 2 1/2. I don't usually watch Dr. Phil, but I watched his show about potty training, and his way worked for us. Basically when you start potty training seriously, start by making it fun (party atmosphere, get his stuffed animals to potty too). We did first practices outside on the back porch, waiting til he had to pee. I had bought a secret new toy (water squirters) that were the prize for when he peed right on his potty chair. That worked, and having a couple accidents (when they are really training and making the switch) helps to reinforce that going potty feels better than wet pants. But going poo-poo is harder, my son could not clean up himself, he did some of the times, but was not wiping himself well and would get rashes. So I had to help him with that even when he was in kindergarten.
I am thankful he only had couple accidents at night. I used to be a bedwetter when I was a kid, that isn't something you can train kids to stop, unfortunately, I took some meds for it, and did all kinds of beeper machines that were annoying and finally stopped at age 11. that is a different thing than just a potty training issue, but just wanted to share.