code: public static function elementsEqual(Iterator $iterator1, Iterator $iterator2) : bool
      {
          while ($iterator1->valid() && $iterator2->valid()) {
              if (!Objects::equal($iterator1->current(), $iterator2->current())) {
                  return false;
              }
              $iterator1->next();
              $iterator2->next();
          }
          return !$iterator1->valid() && !$iterator2->valid();
      }
docs: Checks whether the elements provided by the given iterators are equal correspondingly.
  It uses {@link Objects::equal()} for equality check.
  
  @param Iterator $iterator1
  @param Iterator $iterator2
  @return bool