public function SignUpUser()
 {
     $user = addslashes(trim($_POST['username']));
     $psw = addslashes(trim($_POST['password']));
     $fname = addslashes(trim($_POST['fname']));
     $lname = addslashes(trim($_POST['lname']));
     $email = addslashes(trim($_POST['email']));
     $birthday = addslashes(trim($_POST['birthday']));
     $phone = addslashes(trim($_POST['phone']));
     $name = addslashes(trim($_POST['nameshow']));
     $address = addslashes(trim($_POST['address']));
     $district = addslashes(trim($_POST['district']));
     $province = addslashes(trim($_POST['province']));
     $postcode = addslashes(trim($_POST['postcode']));
     $sqlProvince = "select PROVINCE_NAME from province where PROVINCE_ID = '" . $province . "'";
     $result = mysqli_query(parent::getLink(), $sqlProvince);
     $pro = "";
     while ($data = mysqli_fetch_array($result)) {
         $pro = $data['PROVINCE_NAME'];
     }
     $address .= " อ." . $district . " จ." . $pro;
     //$pattern = "/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])\w{8,16}$/";
     $pattern = "/^(?=.*\\d)(?=.*[a-zA-Z])(?=.*[0-9])\\w{8,16}\$/";
     if (!preg_match($pattern, $psw)) {
         echo "not match";
         exit;
     }
     $sql = "INSERT INTO user ";
     $sql .= " VALUES(0, '{$user}' , '{$psw}' , 'member' , '{$fname}' , '{$lname}' , '{$email}' , '{$birthday}' ,'{$address}','{$phone}');";
     //$select = "select username,password from user where username = '******' AND password = '******'";
     //$r_s = mysqli_query(parent::getLink(), $select);
     $rs = mysqli_query(parent::getLink(), $sql);
     if ($rs) {
         echo "success";
         exit;
     } else {
         echo "error";
         exit;
     }
 }
            <div class="navbar-header">
                <button class="navbar-toggle collapsed menu-nav" data-toggle="collapse" data-target="#topNav" >
                    MENU
                </button> 
                <a href="admin.php" class="navbar-brand">         
                    <font size="5">Management User</font>   
                </a>
            </div>          
        </div>
    </nav>
    <?php 
include_once './config/config.php';
$id = $_GET['id'];
$sql = "select * from user where user_id = '" . $id . "'";
$db = new dbConnection();
$rs = mysqli_query($db->getLink(), $sql);
$username = "";
$firstname = "";
$lastname = "";
$password = "";
$type = "";
$email = "";
$birthday = "";
$address = "";
$phone = "";
while ($row = mysqli_fetch_array($rs)) {
    $username = $row['username'];
    $firstname = $row['firstname'];
    $lastname = $row['lastname'];
    $password = $row['password'];
    $type = $row['type'];