session_start();
    include ("connect.php");

    if ($_SERVER['REQUEST_METHOD'] == 'POST')
    {

    header('Content-type: application/json');

    $valid = false;
    $message = '';
    //get the name and comment entered by user
    $userName = $_POST['userName'];
    $password = $_POST['password'];
    //echo password_hash($password, PASSWORD_DEFAULT);

    $userName = mysqli_real_escape_string($con, $_POST['userName']);
    $password = mysqli_real_escape_string($con, $_POST['password']);


    //select results from the form input
    $query = "SELECT * FROM registration WHERE userName = '$userName' and password = '$password'";
    $result = mysqli_query($con, $query) or die ("Failed to query database.");
    $num1=mysqli_num_rows($result);
    $row = mysqli_fetch_assoc($result);

    if($num1==1)
    {
    $_SESSION['userName']=$userName;
    header("Location: index.php");
    }

    else {
   // If the password does not exist in the table, the ``$valid`` variable define as false.
   $valid = true;
   $message = 'Login details are incorrect.';

    echo json_encode(
    $valid ? array('valid' => $valid) : array('valid' => $valid, 'message' =>     $message)
    );
    }


    }

$(document).ready(function() {
  $('#header-form').bootstrapValidator({
    live : 'disabled',
    // To use feedback icons, ensure that you use Bootstrap v3.1.0 or later
    feedbackIcons: {
        valid: 'glyphicon glyphicon-ok',
        invalid: 'glyphicon glyphicon-remove',
        validating: 'glyphicon glyphicon-refresh'
    },
    fields: {
        userName: {
            message: 'The username is not valid',
            validators: {
                notEmpty: {
                    message: 'The username is required'
                }
            }
        },
        password: {
            validators: {
                notEmpty: {
                    message: 'The password is required'
                },
                remote: {
                    message: 'The password is incorrect.',
                    url: "/Trndda-Beta/pages/login.php"
                }
            }
        }
    }
});
});