Quick sort median pivot

   function selectPivot(array $array)
   {
      $x      = $array[0];
      $y      = $array[(int)(count($array)/2)];
      $z      = $array[count($array)-1];
      if($x>=$y)
      {
         if($y>=$z)
            return $y;
         return $x>=$z?$z:$x;
      }
      if($x>=$z)
         return $x;
      return $y>=$z?$z:$y;
   }