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Diffstat (limited to 'themes/twentyfifteen/inc/back-compat.php')
-rw-r--r-- | themes/twentyfifteen/inc/back-compat.php | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/themes/twentyfifteen/inc/back-compat.php b/themes/twentyfifteen/inc/back-compat.php new file mode 100644 index 00000000..73cd44d1 --- /dev/null +++ b/themes/twentyfifteen/inc/back-compat.php @@ -0,0 +1,63 @@ +<?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' ); |