[GIT-PULLS] [php-src] PR #22838: ext/standard: stream_filter_register() orphaned user_filter_map on sh…

Pull Request: https://github.com/php/php-src/pull/22838
Author: devnexen

…utdown re-registration.

Fix GH-22818

During request shutdown the user_filter_map is torn down by the user_filters RSHUTDOWN before the streams referencing it are flushed. A user filter whose filter() callback re-registers the filter recreated the now-NULL map, then, since the volatile factory was still present in FG(stream_filters), deleted the freshly added entry and left an empty orphaned map behind. The following stream_filter_append() located the factory but no matching fdat, tripping ZEND_ASSERT(fdat), and the recreated map leaked.

Register the volatile factory first and only create and populate user_filter_map on success, so a re-registration during the shutdown window fails without recreating the map. The existing NULL-map guard in user_filter_factory_create() then handles the append gracefully.