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Wordpress : Page that can be viewed only by members and if not a member than show them a registration page
function get_user_role()
{
    global $current_user;

    $user_roles = $current_user->roles;
    $user_role = array_shift($user_roles);

    return $user_role;
}

<?php
if(is_user_logged_in())
{
    switch(get_user_role())
    {
        case 'customer' :
            //CUSTOMER DISPLAY
        break;
        case 'subscriber' :
            //SUBSCRIBER DISPLAY
        break;
        default :
            //OTHER TYPE OF USER DISPLAY
    }
}
else
{
    //NO LOGGED USER DISPLAY
}
?>