=' ) ) return; if ( 'twentythirteen' != $theme->template ) switch_theme( $theme->template, $theme->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 ); 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.' ), $GLOBALS['wp_version'] ); printf( '

', $message ); }