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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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