来宾会话 - 脚本添加，但不设置会话

您好，我想为客人设置会话，我编写了应该这样做的脚本，它确实如此，但只有插入表格部分...我不知道为什么脚本不想设置会话，如果他有所有信息。

<?php
    session_start();
    if(!isset($_SESSION['user_id']))
    {
        if(isset($_COOKIE['user_id']))
        {
            $_SESSION['user_id'] = $_COOKIE['user_id'];
        }
        else
        {
            date_default_timezone_set('Europe/Zagreb');
            $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
            $ip = $_SERVER['REMOTE_ADDR'];
            $time = date("Y-m-d G:i:s");
            $query = "INSERT INTO table (ip, join_date) VALUES ('$ip', '$time')";
            mysqli_query($dbc, $query);
            $query2 = "SELECT user_id, ip, join_date WHERE ip = '$ip' AND join_date = '$time'";
            $data = mysqli_query($dbc, $query2);
            if(mysqli_num_rows($data) == 1)
            {
                $row = mysqli_fetch_array($data);
                $_SESSION['user_id'] = $row['user_id'];
                setcookie('user_id', $row['user_id'], time() + (60 * 60));
            }

            mysqli_close($dbc);
        }
    }
?>