wp-includes/widgets/class-wp-widget-rss.php:157Handles updating settings for the current RSS widget instance.
$new_instancearray$old_instancearrayarray public function update( $new_instance, $old_instance ) { $testurl = ( isset( $new_instance['url'] ) && ( ! isset( $old_instance['url'] ) || ( $new_instance['url'] !== $old_instance['url'] ) ) ); return wp_widget_rss_process( $new_instance, $testurl ); }Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/widgets/class-wp-widget-rss.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.