My PHP script that is based on the two-factor verification security principle. Once the user logs in, their cellphone is texted by my program by utilizing Twilio's 3rd party API. Once the login takes place, if the password works, then the user is redirected to another page where the user inputs the pin number that was texted to their phone." [master (root-commit) c414fd2] My PHP script that is based on the two-factor verification security principle. Once the user logs in, their cellphone is texted by my program by utilizing Twilio's 3rd party API. Once the login takes place, if the password works, then the user is redirected to another page where the user inputs the pin number that was texted to their phone.