From localhost to UK2 - My login scripts no longer work

Question

I have spent the last few months creating a website locally on my PC. I have now purchased a domain and uploaded my files, and database.

For some reason I cannot think of, users can no longer login to the website - and I have also check my login credentials with UK2.net and they said they are all correct.

What might be going wrong?

Login Form:

<form action="login.php" method="post" >
    Email<br />
    <input name="email" type="text" /><br /><br />
    Password<br />
    <input name="password" type="password" /><br />
    <input name="submit" type="submit" value="Log In" />
</form>

Login PHP:

require_once('/scripts/includePDO.php');

$error = '';
$form = $_POST['submit'];
$email = $_POST['email'];
$password = $_POST['password'];

if( isset($form) ) {
if( isset($email) && isset($password) && $email !== '' && $password !== '' ) {

$sql = "SELECT * FROM tbl_users WHERE email = :email and password = :password";

$q   = $conn->prepare($sql); // the default way of PDO to manage errors is quite the same as `or die()` so no need for that
        $q->bindValue(':email',$email,PDO::PARAM_STR);
        $q->bindValue(':password',$password,PDO::PARAM_STR);
        $q->execute();

            $r = $q->fetch(PDO::FETCH_ASSOC);
            if(($r)!=0)

{ //success

$answer = $r['id'];

$_SESSION['logged-in'] = true;
$_SESSION['who'] = $answer;

//If the login details are entered and they match those in the database, forward to new page.
header('Location: /home/');

exit;

// If information is wrong or missing, provide error message.
} else { echo "Sorry, something hasn't worked. Are you entering all the information correctly?"; }
} 

}

Answer 1

The answer was -

There was a slash before scripts/includePDO.php that did not need to be there, which made it impossible to find the file.