$link = mysqli_connect('localhost','user','pass','basa') or die("Error " . mysqli_error($link));
if(mysqli_connect_errno())
die('Ошибка соединения: '.mysqli_connect_error());
mysqli_set_charset($link, "utf8");
mysqli_query($link, "INSERT INTO `table` SET `username`='".$userName."', `email`='".$email."', `company`='".$company."' ") or die("Ошибка запроса: " . mysql_error());