ob_start();
    require("../includes/header.php");
    if($_SERVER["REQUEST_METHOD"] == "POST"){
        $p_num = $_POST["username"];
        $pwd = $_POST["password"];
        ob_clean();

        $query = "SELECT * FROM `$user_table` WHERE `user_id` = '$p_num'";
        $result = mysqli_query($connect, $query) or die(mysqli_error($connect));

        while($row = mysqli_fetch_assoc($result)){
            $user_id = "{$row['user_id']}";
            $first_name = "{$row['first_name']}";
            $last_name = "{$row['last_name']}";
            $user_name = $first_name ." " .$last_name;
            $password = "{$row['password']}";
            $image = "{$row['image']}";
            $email = "{$row['email']}";
            $program = "{$row['program']}";
            $role = "{$row['role']}";
            $status = "{$row['logged_in']}";
            $registered = "{$row['registered']}";

            if(($user_id == $p_num) && password_verify($pwd, $password)){
                $_SESSION["id"] = $user_id;
                $_SESSION["user"] = $user_name;
                $_SESSION["program"] = $program;
                $_SESSION["pass"] = $password;
                $_SESSION["image"] = $image;
                $_SESSION["email"] = $email;
                $_SESSION["role"] = $role;
                $_SESSION["status"] = $status;
                $_SESSION["registered"] = $registered;
                $loggedin = "UPDATE `$user_table` SET `logged_in` = 1 WHERE `user_id` = '$user_id'";

                if($_SESSION["status"] == 1){
                    header("Location: ../pages/denied_login.php");
                }
                elseif($_SESSION["registered"] == 0){
                    header("Location: ../pages/not_registered.php");
                }
                else{
                    header("Location: ../pages/instructor.php");
                    mysqli_query($connect, $loggedin);
                }
            }
            else{
                header("Refresh: 1; URL=../index.php");
            }
        }
        echo json_encode(array("success"=>1));
    }

$("#login").on("click", function(){
        $.post("../php/login.php", {}, function(response){
            if(response.success == "1"){
                location.replace("../pages/instructor.php");
            }
        })
    })