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back-compat.php (2476B)

      1 <?php
      2 /**
      3  * Back compat functionality
      4  *
      5  * Prevents the theme from running on WordPress versions prior to 5.3,
      6  * since this theme is not meant to be backward compatible beyond that and
      7  * relies on many newer functions and markup changes introduced in 5.3.
      8  *
      9  * @package WordPress
     10  * @subpackage Twenty_Twenty_One
     11  * @since Twenty Twenty-One 1.0
     12  */
     13 
     14 /**
     15  * Display upgrade notice on theme switch.
     16  *
     17  * @since Twenty Twenty-One 1.0
     18  *
     19  * @return void
     20  */
     21 function twenty_twenty_one_switch_theme() {
     22 	add_action( 'admin_notices', 'twenty_twenty_one_upgrade_notice' );
     23 }
     24 add_action( 'after_switch_theme', 'twenty_twenty_one_switch_theme' );
     25 
     26 /**
     27  * Adds a message for unsuccessful theme switch.
     28  *
     29  * Prints an update nag after an unsuccessful attempt to switch to
     30  * the theme on WordPress versions prior to 5.3.
     31  *
     32  * @since Twenty Twenty-One 1.0
     33  *
     34  * @global string $wp_version WordPress version.
     35  *
     36  * @return void
     37  */
     38 function twenty_twenty_one_upgrade_notice() {
     39 	echo '<div class="error"><p>';
     40 	printf(
     41 		/* translators: %s: WordPress Version. */
     42 		esc_html__( 'This theme requires WordPress 5.3 or newer. You are running version %s. Please upgrade.', 'twentytwentyone' ),
     43 		esc_html( $GLOBALS['wp_version'] )
     44 	);
     45 	echo '</p></div>';
     46 }
     47 
     48 /**
     49  * Prevents the Customizer from being loaded on WordPress versions prior to 5.3.
     50  *
     51  * @since Twenty Twenty-One 1.0
     52  *
     53  * @global string $wp_version WordPress version.
     54  *
     55  * @return void
     56  */
     57 function twenty_twenty_one_customize() {
     58 	wp_die(
     59 		sprintf(
     60 			/* translators: %s: WordPress Version. */
     61 			esc_html__( 'This theme requires WordPress 5.3 or newer. You are running version %s. Please upgrade.', 'twentytwentyone' ),
     62 			esc_html( $GLOBALS['wp_version'] )
     63 		),
     64 		'',
     65 		array(
     66 			'back_link' => true,
     67 		)
     68 	);
     69 }
     70 add_action( 'load-customize.php', 'twenty_twenty_one_customize' );
     71 
     72 /**
     73  * Prevents the Theme Preview from being loaded on WordPress versions prior to 5.3.
     74  *
     75  * @since Twenty Twenty-One 1.0
     76  *
     77  * @global string $wp_version WordPress version.
     78  *
     79  * @return void
     80  */
     81 function twenty_twenty_one_preview() {
     82 	if ( isset( $_GET['preview'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
     83 		wp_die(
     84 			sprintf(
     85 				/* translators: %s: WordPress Version. */
     86 				esc_html__( 'This theme requires WordPress 5.3 or newer. You are running version %s. Please upgrade.', 'twentytwentyone' ),
     87 				esc_html( $GLOBALS['wp_version'] )
     88 			)
     89 		);
     90 	}
     91 }
     92 add_action( 'template_redirect', 'twenty_twenty_one_preview' );