$arr[] = 'Missing parameter in the request : responsibility';
    echo json_encode($arr);
    die;
}
$involvement = null;
if (isset($_POST['involvement']) && !empty($_POST['involvement'])) {
    $involvement = $_POST['involvement'];
} else {
    header('Content-type: application/json');
    $arr = array();
    $arr[] = -1;
    $arr[] = 'Missing parameter in the request : involvement';
    echo json_encode($arr);
    die;
}
$threethings = null;
if (isset($_POST['threethings']) && !empty($_POST['threethings'])) {
    $threethings = $_POST['threethings'];
} else {
    header('Content-type: application/json');
    $arr = array();
    $arr[] = -1;
    $arr[] = 'Missing parameter in the request : threethings';
    echo json_encode($arr);
    die;
}
$conn = mysqli_connect(SERVER_ADDRESS, USER_NAME, PASSWORD, DATABASE);
$result = People::switchCampusAmbassador($anwid, $email, $address, $degree, $graduation, $responsibility, $involvement, $threethings, $conn);
mysqli_close($conn);
header('Content-type: application/json');
echo json_encode($result);