_x000D_ _x000D_ I am using PHP for a year now. I used to build my website using a way that i think it will not be suitable for an application that has multiple interfaces (web, Android, IOS..). I simply create an html page or a form and then handle the inputs in PHP script. This is a simple example of a login script: This is the login form: Here is the login process handled in a PHP script: 0){ $_SESSION['username']=$username; header('Location:myblog.php'); } else header('Location:index.php?error=Please check your username and your password!'); }else header('Location:index.php?error=Username and password are mandatory!'); ?> As you see, i call the html input fields by name and check user input. I believe this is a bad practice to build a website. So my question is what is the best practice to create a web application in PHP that deals with several interfaces? i just want the main concept. Also it would be very good with a small example. Thanks