<?php

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/**

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* Twenty Nineteen back compat functionality

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*

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* Prevents Twenty Nineteen from running on WordPress versions prior to 4.7,

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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 4.7.

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*

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* @package WordPress

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* @subpackage Twenty_Nineteen

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* @since Twenty Nineteen 1.0.0

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*/

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/**

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* Prevent switching to Twenty Nineteen 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 Nineteen 1.0.0

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*/

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function twentynineteen_switch_theme() {

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switch_theme( WP_DEFAULT_THEME );

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unset( $_GET['activated'] );

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add_action( 'admin_notices', 'twentynineteen_upgrade_notice' );

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}

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add_action( 'after_switch_theme', 'twentynineteen_switch_theme' );

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/**

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* Adds a 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 Nineteen on WordPress versions prior to 4.7.

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*

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* @since Twenty Nineteen 1.0.0

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*

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* @global string $wp_version WordPress version.

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*/

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function twentynineteen_upgrade_notice() {

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/* translators: %s: WordPress version. */

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$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'] );

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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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* Prevents the Customizer from being loaded on WordPress versions prior to 4.7.

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*

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* @since Twenty Nineteen 1.0.0

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*

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* @global string $wp_version WordPress version.

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*/

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function twentynineteen_customize() {

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wp_die(

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sprintf(

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/* translators: %s: WordPress version. */

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__( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ),

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$GLOBALS['wp_version']

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),

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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', 'twentynineteen_customize' );

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/**

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* Prevents the Theme Preview from being loaded on WordPress versions prior to 4.7.

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*

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* @since Twenty Nineteen 1.0.0

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*

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* @global string $wp_version WordPress version.

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*/

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function twentynineteen_preview() {

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if ( isset( $_GET['preview'] ) ) {

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/* translators: %s: WordPress version. */

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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'] ) );

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}

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}

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add_action( 'template_redirect', 'twentynineteen_preview' );

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