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