[Solved] isset not working correct.

The problem is that the variables $page_id and $path are set so will always evaluate to TRUE. Use empty() instead

Code:

$page_id = $this->input->get('page_id');
$path = $this->input->get('path');
$route = $this->uri->segment(1).'/'.$this->uri->segment(2);

if ($route != '/')
{
   if (! empty($page_id))
   {
       $class = '-' . $page_id;
   } elseif (! empty($path))
   {
       $class = '-' . $path;
   } else
  {
       $class = '';
   }
}

Thanks every one works great now.

There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!