config.php

<?php
// Adatbázis bejelentkezési adatok
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'main');

// Csatlakozás MySQL-re
$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
mysqli_set_charset($link, "utf8");

// Csatlakozás ellenőrzése
if ($link === false) {
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

function pdo_connect_mysql()
{
    // Update the details below with your MySQL details
    $DATABASE_HOST = 'localhost';
    $DATABASE_USER = 'root';
    $DATABASE_PASS = '';
    $DATABASE_NAME = 'main';
    try {
        return new PDO('mysql:host=' . $DATABASE_HOST . ';dbname=' . $DATABASE_NAME . ';charset=utf8', $DATABASE_USER, $DATABASE_PASS);
    } catch (PDOException $exception) {
        // If there is an error with the connection, stop the script and display the error.
        exit('Failed to connect to database!');
    }
}
$num_items_in_cart = isset($_SESSION['cart']) ? count($_SESSION['cart']) : 0;