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<?php
/**
* Twenty Sixteen back compat functionality
*
* Prevents Twenty Sixteen from running on WordPress versions prior to 4.4,
* since this theme is not meant to be backward compatible beyond that and
* relies on many newer functions and markup changes introduced in 4.4.
*
* @package WordPress
* @subpackage Twenty_Sixteen
* @since Twenty Sixteen 1.0
*/
/**
* Prevent switching to Twenty Sixteen on old versions of WordPress.
*
* Switches to the default theme.
*
* @since Twenty Sixteen 1.0
*/
function twentysixteen_switch_theme() {
switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
unset( $_GET['activated'] );
add_action( 'admin_notices', 'twentysixteen_upgrade_notice' );
}
add_action( 'after_switch_theme', 'twentysixteen_switch_theme' );
/**
* Adds a message for unsuccessful theme switch.
*
* Prints an update nag after an unsuccessful attempt to switch to
* Twenty Sixteen on WordPress versions prior to 4.4.
*
* @since Twenty Sixteen 1.0
*
* @global string $wp_version WordPress version.
*/
function twentysixteen_upgrade_notice() {
$message = sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] );
printf( '<div class="error"><p>%s</p></div>', $message );
}
/**
* Prevents the Customizer from being loaded on WordPress versions prior to 4.4.
*
* @since Twenty Sixteen 1.0
*
* @global string $wp_version WordPress version.
*/
function twentysixteen_customize() {
wp_die(
sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] ), '', array(
'back_link' => true,
)
);
}
add_action( 'load-customize.php', 'twentysixteen_customize' );
/**
* Prevents the Theme Preview from being loaded on WordPress versions prior to 4.4.
*
* @since Twenty Sixteen 1.0
*
* @global string $wp_version WordPress version.
*/
function twentysixteen_preview() {
if ( isset( $_GET['preview'] ) ) {
wp_die( sprintf( __( 'Twenty Sixteen requires at least WordPress version 4.4. You are running version %s. Please upgrade and try again.', 'twentysixteen' ), $GLOBALS['wp_version'] ) );
}
}
add_action( 'template_redirect', 'twentysixteen_preview' );
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