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<html>
<head>
<title>PHP Project: Login</title>
</head>
<body>

<?php

//Error reporting
ini_set('display_errors', '1');
error_reporting(E_ALL);

//Start the session
session_start();

//Session Variables
$_SESSION['username'] = $_POST["username"];
$_SESSION['password'] = $_POST["password"];

//Validation Function
function validate_input($val_user, $val_pass)
{
    if ($val_user == null && $val_pass == null)
    {
        //No username or password were entered
        return 1;
    }
    else
    {
        if ($val_user == null)
        {
            //No username entered
            return 2;
        }
        else
        {
            if ($val_pass == null)
            {
                //No password was entered
                return 3;
            }
            else
            {
                //User input was validated successfully
                return 0;
            }
        }
    }
}

switch (validate_input($_SESSION['username'], $_SESSION['password']))
{
    case 0:
    {
        //User input was validated successfully
        echo "Success! :>";
        //do stuff
        break;
    }
    case 1:
    {
        //No username or password were entered
        echo "You did not enter a username OR password";
        break;
    }
    case 2:
    {
        //No password was entered
        echo "You did not enter a username";
        break;
    }
    case 3:
    {
        //No password was entered
        echo "You did not enter a password";
        break;
    }
}

?>

</body>
</html>