get_template() ) switch_theme( $theme->get_template(), $theme->get_stylesheet() ); elseif ( 'twentythirteen' != WP_DEFAULT_THEME ) switch_theme( WP_DEFAULT_THEME ); unset( $_GET['activated'] ); add_action( 'admin_notices', 'twentythirteen_upgrade_notice' ); } add_action( 'after_switch_theme', 'twentythirteen_switch_theme', 10, 2 ); /** * Prints an update nag after an unsuccessful attempt to switch to * Twenty Thirteen on WordPress versions prior to 3.6. * * @since Twenty Thirteen 1.0 * * @return void */ function twentythirteen_upgrade_notice() { $message = sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ); printf( '
%s