รบกวนสอบถามหน่อยศึกษาการสร้างเว็บครับ อัพขึ้นโฮลจริงระบบสมาชิกสมัครไม่ได้ครับ

<?php
session_start();

// initializing variables
$username = "";
$email    = "";
$errors = array(); 

// connect to the database
$db = mysqli_connect('localhost', 'root', '123456789', 'registration');

// REGISTER USER
if (isset($_POST['reg_user'])) {
  // receive all input values from the form
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $email = mysqli_real_escape_string($db, $_POST['email']);
  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);

  if (mysqli_connect_errno())
	{
		echo "Database Connect Failed : " . mysqli_connect_error();
		exit();
	}

	//*** Reject user not online
	$intRejectTime = 20; // Minute
	$sql = "UPDATE member SET LoginStatus = '0', LastUpdate = '0000-00-00 00:00:00'  WHERE 1 AND DATE_ADD(LastUpdate, INTERVAL $intRejectTime MINUTE) <= NOW() ";
	$query = mysqli_query($con,$sql);
  // form validation: ensure that the form is correctly filled ...
  // by adding (array_push()) corresponding error unto $errors array
  if (empty($username)) { array_push($errors, "Username is required"); }
  if (empty($email)) { array_push($errors, "Email is required"); }
  if (empty($password_1)) { array_push($errors, "Password is required"); }
  if ($password_1 != $password_2) {
	array_push($errors, "The two passwords do not match");
  }

  // first check the database to make sure 
  // a user does not already exist with the same username and/or email
  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
  $result = mysqli_query($db, $user_check_query);
  $user = mysqli_fetch_assoc($result);
  
  if ($user) { // if user exists
    if ($user['username'] === $username) {
      array_push($errors, "Username already exists");
    }

    if ($user['email'] === $email) {
      array_push($errors, "email already exists");
    }
  }

  // Finally, register user if there are no errors in the form
  if (count($errors) == 0) {
  	$password = md5($password);//encrypt the password before saving in the database

  	$query = "INSERT INTO users (username, email, password) 
  			  VALUES('$username', '$email', '$password')";
  	mysqli_query($db, $query);
  	$_SESSION['username'] = $username;
  	$_SESSION['success'] = "เข้าสู่ระบบสำเร๊จ";
  	header('location: index.php');
  }
}

// LOGIN USER
if (isset($_POST['login_user'])) {
    $username = mysqli_real_escape_string($db, $_POST['username']);
    $password = mysqli_real_escape_string($db, $_POST['password']);
  
    if (empty($username)) {
        array_push($errors, "กรุณาใส่ Username");
    }
    if (empty($password)) {
        array_push($errors, "กรุณาใส่ Password");
    }
  
    if (count($errors) == 0) {
        $password = md5($password);
        $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
        $results = mysqli_query($db, $query);
        if (mysqli_num_rows($results) == 1) {
          $_SESSION['username'] = $username;
          $_SESSION['success'] = "เข้าสู่ระบบสำเร๊จ";
          header('location: index.php');
        }else {
            array_push($errors, "ชื่อผู้ใช้ หรือ รหัสผ่านไม่ถูกต้อง");
        }
    }
  }
  
  ?>