$db = new mysqli('blah');
$stmt = $db->prepare("SELECT name FROM cats WHERE cat_id=?");
$stmt->bind_param('i',$_GET['cat_id']);
$stmt->execute();
$stmt->bind_result($name);
$stmt->fetch();
$stmt->close();
$db->close();
if (...)
{
  ...
}
else if ($name == 'Polly')
{
  echo "It's pollY!!!!1111111";
}
else
{
  ...
}