php - Use of undefined root path

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I'm following a tutorial there I get an undefined constant ROOT_PATH. I have a register page that includes a file called path.php that contains the constant ROOT_PATH, below that I have another include that links a file called users like this.

<?php



include(ROOT_PATH . "/app/database/db.php");
include(ROOT_PATH . "/app/helpers/validateUser.php");

$errors = array();
$username = '';
$email = '';
$password = '';
$passwordConf = '';


if(isset($_POST['register-btn'])){
    $errors = validateUser($_POST);
  

    if(count($errors) ===0){
        

        unset($_POST['register-btn'], $_POST['passwordConf']);
        $_POST['admin'] = 0;
    
        $_POST['password'] = password_hash($_POST['password'], PASSWORD_DEFAULT);
    
        $user_id = create('users', $_POST);
        $user = selectOne('users', ['id' => $user_id]);
    
        

        $_SESSION['id'] = $user['id'];
        $_SESSION['username'] = $user['username'];
        $_SESSION['admin'] = $user['admin'];
        $_SESSION['message'] = 'you are now logged in';
        $_SESSION['type'] = 'success';

        if($_SESSION['admin']){
            header('location: ' . BASE_URL . '/admin/dashboard.php');

        } else {
            header('location: ' . BASE_URL . '/index.php');
        }

        header('location: ' . BASE_URL . '/index.php');
        exit();

    } else{
        $username = $_POST ['username'];
        $email = $_POST ['email'];
        $password = $_POST ['password'];
        $passwordConf = $_POST ['password'];
    }

if(isset($_POST['login-btn'])){
    $errors = validateLogin($_POST);

    if(count($errors) === 0){
        $user = selectOne('users', ['username' => $_POST['username']]);

        if ($user && password_verify($_POST['password'], $user['password'])){

            $_SESSION['id'] = $user['id'];
            $_SESSION['username'] = $user['username'];
            $_SESSION['admin'] = $user['admin'];
            $_SESSION['message'] = 'you are now logged in';
            $_SESSION['type'] = 'success';
    
            if($_SESSION['admin']){
                header('location: ' . BASE_URL . '/admin/dashboard.php');
    
            } else {
                header('location: ' . BASE_URL . '/index.php');
            }
    
            header('location: ' . BASE_URL . '/index.php');
        }
            exit();
        } else{
            array_push($errors, 'wrong credentials');
        }
     }
   }

now according to him I do not need to link path.php in users because on the register page there I linked path.php goes to the users.php but I still get this message: Warning: Use of undefined constant ROOT_PATH - assumed 'ROOT_PATH' (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\phpblogtut\app\controlers\users.php on line 5

this is register.php :

   <?php include("path.php"); ?>
<?php include(ROOT_PATH . "/app/controlers/users.php"); ?>
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <!-- Font Awesome -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" />
  <!-- Custom CSS -->
  <link rel="stylesheet" href="assets/css/style.css">
  <title>Register</title>
</head>
<body>
  <!-- header -->
  <?php include(ROOT_PATH . '/app/includes/header.php');?>
  <!-- // header -->
  <div class="auth-content">
    <form action="register.php" method="post">
      <h3 class="form-title">Register</h3>
    <?php include(ROOT_PATH . "/app/helpers/formErrors.php");?>
      
      <div>
        <label>Username</label>
        <input type="text" name="username" value="<?php echo $username; ?>" class="text-input">
      </div>
      <div>
        <label>Email</label>
        <input type="email" name="email" value="<?php echo $email; ?>" class="text-input">
      </div>
      <div>
        <label>Password</label>
        <input type="password" name="password" value="<?php echo $password; ?>" class="text-input">
      </div>
      <div>
        <label>Confirm Password</label>
        <input type="password" name="passwordConf" value="<?php echo $passwordConf; ?>" class="text-input">
      </div>
      <div>
        <button type="submit" name="register-btn" class="btn">Register</button>
      </div>
      <p class="auth-nav">Or <a href="<?php echo BASE_URL . '/login.php' ?> ">Sign In</a></p>
    </form>
  </div>
  <!-- JQuery -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="assets/js/script.js"></script>
</body>
</html>

this is path.php :

<?php
    define('ROOT_PATH',realpath(dirname('_FILE_'))); 
    define("BASE_URL", 'http://localhost/phpblogtut');

Answer

Solution:

I think you're missing to include path.php in users.php

your users.php file should be

<?php include_once("path.php"); ?> // **include path.php in users.php**
<?php include(ROOT_PATH . "/app/database/db.php");
    include(ROOT_PATH . "/app/helpers/validateUser.php"); ?>

and the register.php file should be

<?php include_once("path.php"); ?> // remove this line if this files includes users.php
    <?php include(ROOT_PATH . "/app/controlers/users.php"); ?>

Answer

Solution:

If you want to use a constant, you have to include the file containing the constant, if it was not declared in the same PHP file. So, you need to include path.php.

<?php 
    include('path.php');
    include(ROOT_PATH . "/app/database/db.php");
    include(ROOT_PATH . "/app/helpers/validateUser.php");

Could you link the tutorial?

Source