function evalLoggedUser($conx,$id,$u,$p){
    $sql = "SELECT ip FROM users WHERE id=? AND username=? AND password=? AND activated=? LIMIT 1";
    $stmt = $conx->prepare($sql);
    $var = 1;
    $stmt->bind_param("issi",$id,$u,$p,$var);
    $stmt->execute();
    $numrows = $stmt->num_rows;
    if($numrows > 0){
        return true;
    }
    $stmt->close();
}

$user_ok = evalLoggedUser($conn,$log_id,$log_username,$log_password);

function evalLoggedUser($conx,$id,$u,$p){
$sql = "SELECT ip FROM users WHERE id='$id' AND username='$u' AND password='$p' AND activated='1' LIMIT 1";
    $query = mysqli_query($conx, $sql);
    $numrows = mysqli_num_rows($query);
    if($numrows > 0){
        return true;
    }
}
$user_ok = evalLoggedUser($conn,$log_id,$log_username,$log_password);