title: using qrcode to login a website php
body: <p>I am thinking of making a Login system where a user enters their username, password and scans a QR code which is then sent to a PHP page.</p>
  
  <p>I would then use those credentials to authenticate the user.</p>
  
  <p>I have a PHP login page and an android application to scan a QR code but do not know how to link them.</p>
  
  <p>Also does anyone know if this has been done before?</p>