i have to trouble trying to debug this code and i know it´s something on line 26 and i have tried different methods to solve it like changing it to mysql and defining db
<?php
session_start();
include('connection.php');
if(isset($_POST['Login']))
{
    include ('/ClassLogin.php');  
    $login = new Login();
    if
        ($login->isLoggedIn())
        header('location: indeks.html');
    else 
        $login->showErros ();
}
$Token = $_SESSION['token'] = md5(uniqid(mt_rand(),TRUE));
$username = $_POST["username"];
$password = $_POST["password"];
$sql = "SELECT id FROM $tbl WHERE username = '$username' and password = '$password'";
class db extends mysqli 
{
  function __construct($localhost, $username, $password, $pokemon7_users, $port=80){
   mysqli::__construct($localhost, $username, $password, $pokemon7_users, $port);
    } 
    $result = mysqli($db, $sql, $link);
if (!result)
{
    printf("Error: ", mysql_error($link));
}
else
{
    Echo "Congratulations you are now logged in";
}
 
     
     
     
     
    