do_action( 'after_switch_theme', string $old_name, WP_Theme $old_theme )

3497			 *3498			 * @since 3.3.03499			 *3500			 * @param string   $old_name  Old theme name.3501			 * @param WP_Theme $old_theme WP_Theme instance of the old theme.3502			 */3503			do_action( 'after_switch_theme', $old_theme->get( 'Name' ), $old_theme );3504		} else {3505			/** This action is documented in wp-includes/theme.php */3506			do_action( 'after_switch_theme', $stylesheet, $old_theme );3507		}3508 3509		flush_rewrite_rules();