3 * Twenty Seventeen back compat functionality
5 * Prevents Twenty Seventeen from running on WordPress versions prior to 4.7,
6 * since this theme is not meant to be backward compatible beyond that and
7 * relies on many newer functions and markup changes introduced in 4.7.
10 * @subpackage Twenty_Seventeen
11 * @since Twenty Seventeen 1.0
15 * Prevent switching to Twenty Seventeen on old versions of WordPress.
17 * Switches to the default theme.
19 * @since Twenty Seventeen 1.0
21 function twentyseventeen_switch_theme() {
22 switch_theme( WP_DEFAULT_THEME );
23 unset( $_GET['activated'] );
24 add_action( 'admin_notices', 'twentyseventeen_upgrade_notice' );
26 add_action( 'after_switch_theme', 'twentyseventeen_switch_theme' );
29 * Adds a message for unsuccessful theme switch.
31 * Prints an update nag after an unsuccessful attempt to switch to
32 * Twenty Seventeen on WordPress versions prior to 4.7.
34 * @since Twenty Seventeen 1.0
36 * @global string $wp_version WordPress version.
38 function twentyseventeen_upgrade_notice() {
39 $message = sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] );
40 printf( '<div class="error"><p>%s</p></div>', $message );
44 * Prevents the Customizer from being loaded on WordPress versions prior to 4.7.
46 * @since Twenty Seventeen 1.0
48 * @global string $wp_version WordPress version.
50 function twentyseventeen_customize() {
51 wp_die( sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] ), '', array(
55 add_action( 'load-customize.php', 'twentyseventeen_customize' );
58 * Prevents the Theme Preview from being loaded on WordPress versions prior to 4.7.
60 * @since Twenty Seventeen 1.0
62 * @global string $wp_version WordPress version.
64 function twentyseventeen_preview() {
65 if ( isset( $_GET['preview'] ) ) {
66 wp_die( sprintf( __( 'Twenty Seventeen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentyseventeen' ), $GLOBALS['wp_version'] ) );
69 add_action( 'template_redirect', 'twentyseventeen_preview' );