Stuff

 if ($yesterday < $nu)
   { echo "OK - UNIVERSE($directory) - TIMESTAMP($x_nu) - INFO($x_yesterday < $x_nu)"; exit(0);}
  else
   {
     if (($today == 6) || ($today == 0)) {
       echo "UNKNOWN - Grey Testing Period, Results Ignored ($x_today - $today)"; exit(0);
     }
     else
     {
       echo "NOK - UNIVERSE($directory) - TIMESTAMP($x_nu) - INFO($x_yesterday < $x_nu)"; exit(2);
     }
   }