MySQLi连接问题

I am having some trouble getting MySQLi to connect and respond properly. It should be relaying a connection error any time it is unable to connect to the database, but it doesn't, even when enter invalid details in an attempt to force a connection error.

$emailaddress = $_POST['emailaddress'];
$password = $_POST['password'];
if ($emailaddress&&$password)
    {
        $db = new mysqli('loalhost','rot','','FitessHouse');
        if($db->connect_errno > 0)  
        {
            die('Unable to connect to database [' . $db->connect_error . ']');
        }
    }

EDIT: Let me be more clear. I am trying to get MySQLi to return a connection error because the connection fails. I'm not trying to fix the connection. When I hit "Submit" it takes me to a blank page, which means my die statement is not working.

Fixed it and now have this error:

Notice: Undefined index: emailaddress in /Applications/XAMPP/xamppfiles/htdocs/FitnessHouse/login.php on line 5

This line of code should display the error and stop the script:

$db = new mysqli('loalhost','rot','','FitessHouse')
    or die('Unable to connect to database [' . $db->connect_error . ']');

You can also use trigger_error instead of die:

$db = new mysqli('loalhost','rot','','FitessHouse');
if($db->connect_errno)
    trigger_error('Unable to connect to database [' . $db->connect_error . ']', E_USER_ERROR);