$star->id = $user_ID ;
$curent_user = get_current_user_id();
$con=mysqli_connect("localhost","username","password","dbname");
$sql = mysqli_query($con,"SELECT * FROM `Fr_star` WHERE `user_id` = ".$curent_user." AND `rate_id` = ".$user_ID."");

$con=mysqli_connect("localhost","username","password","dbname");

$connection = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);