Account Kit lets people quickly register for and login to your app by using just their phone number or email address — no password needed. It's reliable, easy to use and gives you a choice about how you sign up for apps.
This is a demo version of facebook account kit integration with PHP which was explained in the https://www.youtube.com/watch?v=o2-PCiiJzr4 video. This demo has the form to submit and integrate account kit from frontend javascript and verifing the validation from the backend PHP server.