PHP: horror

Codigo horror:

$filename = 'validate.php';

if (file_exists($filename))
 include_once ($filename);
else
{
 $filename = '../'.$filename;

 if (file_exists($filename))
   include_once ($filename);
 else 
 { 
   $filename = '../'.$filename;
 
   if (file_exists($filename))
     include_once ($filename);
   else
     include_once ('../'.$filename);
 }
}