It's broken in php. $node->next() returns only the same object, which has nothing in it except the next method. Literally. What should I do with it if the objects don't even differ from each other in any way and it falls into an endless cycle?

  var_dump(get_object_vars($node));
  var_dump(serialize($node));
  $b = $node->getNext();
  var_dump(get_object_vars($b));
  var_dump(serialize($b));

array(0) {
}
string(33) "O:4:"Node":1:{s:7:"*next";r:1;}"
array(0) {
}
string(33) "O:4:"Node":1:{s:7:"*next";r:1;}"