+
+ if ( array_key_exists( 'wgExtraNamespaces', $pairs ) ) {
+ $this->resetNamespaces();
+ }
+ }
+
+ /**
+ * Must be called whenever namespaces are changed, e.g., $wgExtraNamespaces is altered.
+ * Otherwise old namespace data will lurk and cause bugs.
+ */
+ private function resetNamespaces() {
+ MWNamespace::clearCaches();
+ Language::clearCaches();
+
+ // We can't have the TitleFormatter holding on to an old Language object either
+ // @todo We shouldn't need to reset all the aliases here.
+ $services = MediaWikiServices::getInstance();
+ $services->resetServiceForTesting( 'TitleFormatter' );
+ $services->resetServiceForTesting( 'TitleParser' );
+ $services->resetServiceForTesting( '_MediaWikiTitleCodec' );