Can anyone tell the amount of circulating supply??? How OP did not tell that. I am a trader and I am buying. How to know how much to buy???

Hello. I want to ask does anyone have PHP function or class or something about this problem.
I want to generate valid bitcoin address from "12 words"

I want to register 1 address for each user that register on my website. Each address must be unique and Valid.

Is this even possible??? Thank you for help