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EDIT :: back-compat.php

<?php /** * Twenty Fifteen back compat functionality * * Prevents Twenty Fifteen from running on WordPress versions prior to 4.1, * since this theme is not meant to be backward compatible beyond that and * relies on many newer functions and markup changes introduced in 4.1. * * @package WordPress * @subpackage Twenty_Fifteen * @since Twenty Fifteen 1.0 */ /** * Prevent switching to Twenty Fifteen on old versions of WordPress. * * Switches to the default theme. * * @since Twenty Fifteen 1.0 */ function twentyfifteen_switch_theme() { switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME ); unset( $_GET['activated'] ); add_action( 'admin_notices', 'twentyfifteen_upgrade_notice' ); } add_action( 'after_switch_theme', 'twentyfifteen_switch_theme' ); /** * Add message for unsuccessful theme switch. * * Prints an update nag after an unsuccessful attempt to switch to * Twenty Fifteen on WordPress versions prior to 4.1. * * @since Twenty Fifteen 1.0 */ function twentyfifteen_upgrade_notice() { $message = sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] ); printf( '<div class="error"><p>%s</p></div>', $message ); } /** * Prevent the Customizer from being loaded on WordPress versions prior to 4.1. * * @since Twenty Fifteen 1.0 */ function twentyfifteen_customize() { wp_die( sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] ), '', array( 'back_link' => true, ) ); } add_action( 'load-customize.php', 'twentyfifteen_customize' ); /** * Prevent the Theme Preview from being loaded on WordPress versions prior to 4.1. * * @since Twenty Fifteen 1.0 */ function twentyfifteen_preview() { if ( isset( $_GET['preview'] ) ) { wp_die( sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] ) ); } } add_action( 'template_redirect', 'twentyfifteen_preview' );

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