Handles denied users.
$ip: IP address to check. Prints a message and exits if access is denied.
function drupal_block_denied($ip) {
// Deny access to blocked IP addresses - t() is not yet available.
if (drupal_is_denied($ip)) {
header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
print 'Sorry, ' . check_plain(ip_address()) . ' has been banned.';
exit;
}
}