Access denied to localhost/phpmyadmin (HY000/1130) privileges error

I have a simple database on my localhost and I am following a book

I created tables in it but after I used shared file addresses i.e include ['SERVER_DOCUMENT'].'path of file' the access to PHPMyAdmin is denied.

IT says that:

Cannot connect: invalid settings.
mysqli_real_connect(): (HY000/1130): Host ‘localhost’ is not allowed to connect to this MariaDB server
Connection for controluser as defined in your configuration failed.
mysqli_real_connect(): (HY000/1130): Host ‘localhost’ is not allowed to connect to this MariaDB server
phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server.

I tried uninstalling XAMPP but when I reached the same point again on my book and did everything from start it still did the same thing

<?php
try {
  $pdo = new PDO('mysql:hostname=localhost;dbname=ijdb', 'ijdbuser', 'mypassword');
  $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $pdo->exec('SET NAMES "utf8"');
}
catch (PDOException $e) {
  $error = 'Unable to connect to server' . $e->getMessage();
  include 'error.html';
  exit();
}
?>

index.php

<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/includes/magicquotes.inc.php';
if (isset($_GET['addjoke'])) {
  include 'form.html';
  exit();
}
include $_SERVER['DOCUMENT_ROOT'] . '/includes/db.inc.php';

if (isset($_POST['joketext'])) {
  try {
    $sql = 'INSERT INTO joke SET
        joketext = :joketext,
        jokedate = CURDATE()';
    $s = $pdo->prepare($sql);
    $s->bindValue(':joketext', $_POST['joketext']);
    $s->execute();
  } catch (PDOException $e) {
    $error = 'Error adding submitted joke: ' . $e->getMessage();
    include 'error.html';
    exit();
  }
  header('Location: .');
  exit();
}
if (isset($_GET['deletejoke'])) {
  include $_SERVER['DOCUMENT_ROOT'] . '/includes/db.inc.php';
  try {
    $sql = 'DELETE FROM joke WHERE id = :id';
    $s = $pdo->prepare($sql);
    $s->bindValue(':id', $_POST['id']);
    $s->execute();
  } catch (PDOException $e) {
    $error = 'Error deleting joke: ' . $e->getMessage();
    include 'error.html';
    exit();
  }
  header('Location: .');
  exit();
}
include $_SERVER['DOCUMENT_ROOT'] . '/includes/db.inc.php';

try {
  $sql = 'SELECT joke.id,name,email,joketext FROM joke INNER JOIN author ON authorid=author.id';
  $result = $pdo->query($sql);
} catch (PDOException $e) {
  $error = 'Error fetching jokes: ' . $e->getMessage();
  include 'error.html';
  exit();
}
//while ($row = $result->fetch())
foreach ($result as $value) {
  $jokes[] = array(
    'id' => $value['id'], 'text' => $value['joketext'], 'email' => $value['email'], 'name' => $value['name']
  );
}
include 'jokes.html';
?>

I expect my joke page to be loaded.

Here is an image showing the errors I listed above: