3 Questions about Session and Cookies usage with PHP

Q1
Since sessions in PHP rely on cookies being enabled on the users computer, what happens if the user decides not to use cookies, how could I still maintain the session or how can use sessions in php without using cookies?

Q2
In my php file how would I be able to detect if a user has cookies enabled?
I have a php page that has a simple message saying “Please enable cookies”. I want to redirect to this page if the user has cookies disabled?

Q3
Can someone tell me if it is possible to set and access a cookie in the same page like you can do with sessions?

Thanks