[GIT-PULLS] [php-src] PR #22701: ext/dom: getElementsByClassName() item() returns wrong element on ran…

Pull Request: https://github.com/php/php-src/pull/22701
Author: devnexen

…dom access.

The loop never advanced past the current match, so a cold item($n) with $n >= 1, or a backwards seek, returned the first match. Fixed by mirroring dom_map_get_elements_item(): advance to the next match once per remaining index.