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Editing: back-compat.php
<?php /** * Twenty Nineteen back compat functionality * * Prevents Twenty Nineteen from running on WordPress versions prior to 4.7, * since this theme is not meant to be backward compatible beyond that and * relies on many newer functions and markup changes introduced in 4.7. * * @package WordPress * @subpackage Twenty_Nineteen * @since Twenty Nineteen 1.0.0 */ /** * Prevent switching to Twenty Nineteen on old versions of WordPress. * * Switches to the default theme. * * @since Twenty Nineteen 1.0.0 */ function twentynineteen_switch_theme() { switch_theme( WP_DEFAULT_THEME ); unset( $_GET['activated'] ); add_action( 'admin_notices', 'twentynineteen_upgrade_notice' ); } add_action( 'after_switch_theme', 'twentynineteen_switch_theme' ); /** * Adds a message for unsuccessful theme switch. * * Prints an update nag after an unsuccessful attempt to switch to * Twenty Nineteen on WordPress versions prior to 4.7. * * @since Twenty Nineteen 1.0.0 * * @global string $wp_version WordPress version. */ function twentynineteen_upgrade_notice() { /* translators: %s: WordPress version. */ $message = sprintf( __( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ), $GLOBALS['wp_version'] ); printf( '<div class="error"><p>%s</p></div>', $message ); } /** * Prevents the Customizer from being loaded on WordPress versions prior to 4.7. * * @since Twenty Nineteen 1.0.0 * * @global string $wp_version WordPress version. */ function twentynineteen_customize() { wp_die( sprintf( /* translators: %s: WordPress version. */ __( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ), $GLOBALS['wp_version'] ), '', array( 'back_link' => true, ) ); } add_action( 'load-customize.php', 'twentynineteen_customize' ); /** * Prevents the Theme Preview from being loaded on WordPress versions prior to 4.7. * * @since Twenty Nineteen 1.0.0 * * @global string $wp_version WordPress version. */ function twentynineteen_preview() { if ( isset( $_GET['preview'] ) ) { /* translators: %s: WordPress version. */ wp_die( sprintf( __( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ), $GLOBALS['wp_version'] ) ); } } add_action( 'template_redirect', 'twentynineteen_preview' );
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