setcookie("test", 1);
$session_id = (int)$_COOKIE['test']
$sql = mysqli_query($db_conn, "SELECT * FROM `clicker_user_para` WHERE `id` = $session_id");mysqli_query выдал False, т.е. ошибку.` а не '.$result = mysqli_query($connection, "SELECT * FROM `articles_categories`");