/**
  * Compares the host names of each of the supplied containers.
  *
  * @param Container $a
  * @param Container $b
  * @return int
  */
 public static function cmpFqdnHostname(Container $a, Container $b)
 {
     $aHostname = $a->reverseHostname();
     $bHostname = $b->reverseHostname();
     if ($aHostname == $bHostname) {
         return 0;
     }
     return $aHostname < $bHostname ? -1 : 1;
 }