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back-compat.php (2502B)

      1 <?php
      2 /**
      3  * Twenty Nineteen back compat functionality
      4  *
      5  * Prevents Twenty Nineteen from running on WordPress versions prior to 4.7,
      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 4.7.
      8  *
      9  * @package WordPress
     10  * @subpackage Twenty_Nineteen
     11  * @since Twenty Nineteen 1.0.0
     12  */
     13 
     14 /**
     15  * Prevent switching to Twenty Nineteen on old versions of WordPress.
     16  *
     17  * Switches to the default theme.
     18  *
     19  * @since Twenty Nineteen 1.0.0
     20  */
     21 function twentynineteen_switch_theme() {
     22 	switch_theme( WP_DEFAULT_THEME );
     23 	unset( $_GET['activated'] );
     24 	add_action( 'admin_notices', 'twentynineteen_upgrade_notice' );
     25 }
     26 add_action( 'after_switch_theme', 'twentynineteen_switch_theme' );
     27 
     28 /**
     29  * Adds a message for unsuccessful theme switch.
     30  *
     31  * Prints an update nag after an unsuccessful attempt to switch to
     32  * Twenty Nineteen on WordPress versions prior to 4.7.
     33  *
     34  * @since Twenty Nineteen 1.0.0
     35  *
     36  * @global string $wp_version WordPress version.
     37  */
     38 function twentynineteen_upgrade_notice() {
     39 	printf(
     40 		'<div class="error"><p>%s</p></div>',
     41 		sprintf(
     42 			/* translators: %s: WordPress version. */
     43 			__( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ),
     44 			$GLOBALS['wp_version']
     45 		)
     46 	);
     47 }
     48 
     49 /**
     50  * Prevents the Customizer from being loaded on WordPress versions prior to 4.7.
     51  *
     52  * @since Twenty Nineteen 1.0.0
     53  *
     54  * @global string $wp_version WordPress version.
     55  */
     56 function twentynineteen_customize() {
     57 	wp_die(
     58 		sprintf(
     59 			/* translators: %s: WordPress version. */
     60 			__( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ),
     61 			$GLOBALS['wp_version']
     62 		),
     63 		'',
     64 		array(
     65 			'back_link' => true,
     66 		)
     67 	);
     68 }
     69 add_action( 'load-customize.php', 'twentynineteen_customize' );
     70 
     71 /**
     72  * Prevents the Theme Preview from being loaded on WordPress versions prior to 4.7.
     73  *
     74  * @since Twenty Nineteen 1.0.0
     75  *
     76  * @global string $wp_version WordPress version.
     77  */
     78 function twentynineteen_preview() {
     79 	if ( isset( $_GET['preview'] ) ) {
     80 		wp_die(
     81 			sprintf(
     82 				/* translators: %s: WordPress version. */
     83 				__( 'Twenty Nineteen requires at least WordPress version 4.7. You are running version %s. Please upgrade and try again.', 'twentynineteen' ),
     84 				$GLOBALS['wp_version']
     85 			)
     86 		);
     87 	}
     88 }
     89 add_action( 'template_redirect', 'twentynineteen_preview' );