diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-admin/themes.php
--- a/wp/wp-admin/themes.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-admin/themes.php	Tue Dec 15 13:49:49 2020 +0100
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'switch_themes' ) && ! current_user_can( 'edit_theme_options' ) ) {
 	wp_die(
@@ -18,7 +18,7 @@
 }
 
 if ( current_user_can( 'switch_themes' ) && isset( $_GET['action'] ) ) {
-	if ( 'activate' == $_GET['action'] ) {
+	if ( 'activate' === $_GET['action'] ) {
 		check_admin_referer( 'switch-theme_' . $_GET['stylesheet'] );
 		$theme = wp_get_theme( $_GET['stylesheet'] );
 
@@ -53,7 +53,7 @@
 
 		wp_redirect( admin_url( 'themes.php?resumed=true' ) );
 		exit;
-	} elseif ( 'delete' == $_GET['action'] ) {
+	} elseif ( 'delete' === $_GET['action'] ) {
 		check_admin_referer( 'delete-theme_' . $_GET['stylesheet'] );
 		$theme = wp_get_theme( $_GET['stylesheet'] );
 
@@ -81,13 +81,52 @@
 			wp_redirect( admin_url( 'themes.php?deleted=true' ) );
 		}
 		exit;
+	} elseif ( 'enable-auto-update' === $_GET['action'] ) {
+		if ( ! ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) ) {
+			wp_die( __( 'Sorry, you are not allowed to enable themes automatic updates.' ) );
+		}
+
+		check_admin_referer( 'updates' );
+
+		$all_items    = wp_get_themes();
+		$auto_updates = (array) get_site_option( 'auto_update_themes', array() );
+
+		$auto_updates[] = $_GET['stylesheet'];
+		$auto_updates   = array_unique( $auto_updates );
+		// Remove themes that have been deleted since the site option was last updated.
+		$auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) );
+
+		update_site_option( 'auto_update_themes', $auto_updates );
+
+		wp_redirect( admin_url( 'themes.php?enabled-auto-update=true' ) );
+
+		exit;
+	} elseif ( 'disable-auto-update' === $_GET['action'] ) {
+		if ( ! ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) ) {
+			wp_die( __( 'Sorry, you are not allowed to disable themes automatic updates.' ) );
+		}
+
+		check_admin_referer( 'updates' );
+
+		$all_items    = wp_get_themes();
+		$auto_updates = (array) get_site_option( 'auto_update_themes', array() );
+
+		$auto_updates = array_diff( $auto_updates, array( $_GET['stylesheet'] ) );
+		// Remove themes that have been deleted since the site option was last updated.
+		$auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) );
+
+		update_site_option( 'auto_update_themes', $auto_updates );
+
+		wp_redirect( admin_url( 'themes.php?disabled-auto-update=true' ) );
+
+		exit;
 	}
 }
 
 $title       = __( 'Manage Themes' );
 $parent_file = 'themes.php';
 
-// Help tab: Overview
+// Help tab: Overview.
 if ( current_user_can( 'switch_themes' ) ) {
 	$help_overview = '<p>' . __( 'This screen is used for managing your installed themes. Aside from the default theme(s) included with your WordPress installation, themes are designed and developed by third parties.' ) . '</p>' .
 		'<p>' . __( 'From this screen you can:' ) . '</p>' .
@@ -104,14 +143,18 @@
 			'content' => $help_overview,
 		)
 	);
-} // switch_themes
+} // End if 'switch_themes'.
 
-// Help tab: Adding Themes
+// Help tab: Adding Themes.
 if ( current_user_can( 'install_themes' ) ) {
 	if ( is_multisite() ) {
 		$help_install = '<p>' . __( 'Installing themes on Multisite can only be done from the Network Admin section.' ) . '</p>';
 	} else {
-		$help_install = '<p>' . sprintf( __( 'If you would like to see more themes to choose from, click on the &#8220;Add New&#8221; button and you will be able to browse or search for additional themes from the <a href="%s">WordPress Theme Directory</a>. Themes in the WordPress Theme Directory are designed and developed by third parties, and are compatible with the license WordPress uses. Oh, and they&#8217;re free!' ), __( 'https://wordpress.org/themes/' ) ) . '</p>';
+		$help_install = '<p>' . sprintf(
+			/* translators: %s: https://wordpress.org/themes/ */
+			__( 'If you would like to see more themes to choose from, click on the &#8220;Add New&#8221; button and you will be able to browse or search for additional themes from the <a href="%s">WordPress Theme Directory</a>. Themes in the WordPress Theme Directory are designed and developed by third parties, and are compatible with the license WordPress uses. Oh, and they&#8217;re free!' ),
+			__( 'https://wordpress.org/themes/' )
+		) . '</p>';
 	}
 
 	get_current_screen()->add_help_tab(
@@ -121,9 +164,9 @@
 			'content' => $help_install,
 		)
 	);
-} // install_themes
+} // End if 'install_themes'.
 
-// Help tab: Previewing and Customizing
+// Help tab: Previewing and Customizing.
 if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
 	$help_customize =
 		'<p>' . __( 'Tap or hover on any theme then click the Live Preview button to see a live preview of that theme and change theme options in a separate, full-screen view. You can also find a Live Preview button at the bottom of the theme details screen. Any installed theme can be previewed and customized in this way.' ) . '</p>' .
@@ -137,11 +180,31 @@
 			'content' => $help_customize,
 		)
 	);
-} // edit_theme_options && customize
+} // End if 'edit_theme_options' && 'customize'.
+
+$help_sidebar_autoupdates = '';
+
+// Help tab: Auto-updates.
+if ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) {
+	$help_tab_autoupdates =
+		'<p>' . __( 'Auto-updates can be enabled or disabled for each individual theme. Themes with auto-updates enabled will display the estimated date of the next auto-update. Auto-updates depends on the WP-Cron task scheduling system.' ) . '</p>' .
+		'<p>' . __( 'Please note: Third-party themes and plugins, or custom code, may override WordPress scheduling.' ) . '</p>';
+
+	get_current_screen()->add_help_tab(
+		array(
+			'id'      => 'plugins-themes-auto-updates',
+			'title'   => __( 'Auto-updates' ),
+			'content' => $help_tab_autoupdates,
+		)
+	);
+
+	$help_sidebar_autoupdates = '<p>' . __( '<a href="https://wordpress.org/support/article/plugins-themes-auto-updates/">Learn more: Auto-updates documentation</a>' ) . '</p>';
+} // End if 'update_themes' && 'wp_is_auto_update_enabled_for_type'.
 
 get_current_screen()->set_help_sidebar(
 	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
-	'<p>' . __( '<a href="https://codex.wordpress.org/Using_Themes">Documentation on Using Themes</a>' ) . '</p>' .
+	'<p>' . __( '<a href="https://wordpress.org/support/article/using-themes/">Documentation on Using Themes</a>' ) . '</p>' .
+	$help_sidebar_autoupdates .
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
@@ -166,7 +229,8 @@
 		'l10n'     => array(
 			'addNew'            => __( 'Add New Theme' ),
 			'search'            => __( 'Search Installed Themes' ),
-			'searchPlaceholder' => __( 'Search installed themes...' ), // placeholder (no ellipsis)
+			'searchPlaceholder' => __( 'Search installed themes...' ), // Placeholder (no ellipsis).
+			/* translators: %d: Number of themes. */
 			'themesFound'       => __( 'Number of Themes found: %d' ),
 			'noThemesFound'     => __( 'No themes found. Try a different search.' ),
 		),
@@ -177,7 +241,7 @@
 wp_enqueue_script( 'theme' );
 wp_enqueue_script( 'updates' );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -186,7 +250,7 @@
 	</h1>
 
 	<?php if ( ! is_multisite() && current_user_can( 'install_themes' ) ) : ?>
-		<a href="<?php echo admin_url( 'theme-install.php' ); ?>" class="hide-if-no-js page-title-action"><?php echo esc_html_x( 'Add New', 'Add new theme' ); ?></a>
+		<a href="<?php echo admin_url( 'theme-install.php' ); ?>" class="hide-if-no-js page-title-action"><?php echo esc_html_x( 'Add New', 'theme' ); ?></a>
 	<?php endif; ?>
 
 	<form class="search-form"></form>
@@ -223,17 +287,25 @@
 	?>
 	<div id="message6" class="error"><p><?php _e( 'Theme could not be resumed because it triggered a <strong>fatal error</strong>.' ); ?></p></div>
 	<?php
+} elseif ( isset( $_GET['enabled-auto-update'] ) ) {
+	?>
+	<div id="message7" class="updated notice is-dismissible"><p><?php _e( 'Theme will be auto-updated.' ); ?></p></div>
+	<?php
+} elseif ( isset( $_GET['disabled-auto-update'] ) ) {
+	?>
+	<div id="message8" class="updated notice is-dismissible"><p><?php _e( 'Theme will no longer be auto-updated.' ); ?></p></div>
+	<?php
 }
 
 $ct = wp_get_theme();
 
 if ( $ct->errors() && ( ! is_multisite() || current_user_can( 'manage_network_themes' ) ) ) {
-	echo '<div class="error"><p>' . __( 'ERROR:' ) . ' ' . $ct->errors()->get_error_message() . '</p></div>';
+	echo '<div class="error"><p>' . __( 'Error:' ) . ' ' . $ct->errors()->get_error_message() . '</p></div>';
 }
 
 /*
 // Certain error codes are less fatal than others. We can still display theme information in most cases.
-if ( ! $ct->errors() || ( 1 == count( $ct->errors()->get_error_codes() )
+if ( ! $ct->errors() || ( 1 === count( $ct->errors()->get_error_codes() )
 	&& in_array( $ct->errors()->get_error_code(), array( 'theme_no_parent', 'theme_parent_invalid', 'theme_no_index' ) ) ) ) : ?>
 */
 
@@ -242,10 +314,10 @@
 if ( is_array( $submenu ) && isset( $submenu['themes.php'] ) ) {
 	foreach ( (array) $submenu['themes.php'] as $item ) {
 		$class = '';
-		if ( 'themes.php' == $item[2] || 'theme-editor.php' == $item[2] || 0 === strpos( $item[2], 'customize.php' ) ) {
+		if ( 'themes.php' === $item[2] || 'theme-editor.php' === $item[2] || 0 === strpos( $item[2], 'customize.php' ) ) {
 			continue;
 		}
-		// 0 = name, 1 = capability, 2 = file
+		// 0 = name, 1 = capability, 2 = file.
 		if ( ( strcmp( $self, $item[2] ) == 0 && empty( $parent_file ) ) || ( $parent_file && ( $item[2] == $parent_file ) ) ) {
 			$class = ' current';
 		}
@@ -268,7 +340,8 @@
 				}
 			}
 
-			if ( false !== ( $pos = strpos( $menu_file, '?' ) ) ) {
+			$pos = strpos( $menu_file, '?' );
+			if ( false !== $pos ) {
 				$menu_file = substr( $menu_file, 0, $pos );
 			}
 
@@ -316,25 +389,141 @@
 	<?php } ?>
 
 	<?php if ( $theme['hasUpdate'] ) : ?>
-		<div class="update-message notice inline notice-warning notice-alt">
-		<?php if ( $theme['hasPackage'] ) : ?>
-			<p><?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?></p>
+		<?php if ( $theme['updateResponse']['compatibleWP'] && $theme['updateResponse']['compatiblePHP'] ) : ?>
+			<div class="update-message notice inline notice-warning notice-alt"><p>
+				<?php if ( $theme['hasPackage'] ) : ?>
+					<?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?>
+				<?php else : ?>
+					<?php _e( 'New version available.' ); ?>
+				<?php endif; ?>
+			</p></div>
 		<?php else : ?>
-			<p><?php _e( 'New version available.' ); ?></p>
+			<div class="update-message notice inline notice-error notice-alt"><p>
+				<?php
+				if ( ! $theme['updateResponse']['compatibleWP'] && ! $theme['updateResponse']['compatiblePHP'] ) {
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your versions of WordPress and PHP.' ),
+						$theme['name']
+					);
+					if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+							' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+							self_admin_url( 'update-core.php' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					} elseif ( current_user_can( 'update_core' ) ) {
+						printf(
+							/* translators: %s: URL to WordPress Updates screen. */
+							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+							self_admin_url( 'update-core.php' )
+						);
+					} elseif ( current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: %s: URL to Update PHP page. */
+							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					}
+				} elseif ( ! $theme['updateResponse']['compatibleWP'] ) {
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of WordPress.' ),
+						$theme['name']
+					);
+					if ( current_user_can( 'update_core' ) ) {
+						printf(
+							/* translators: %s: URL to WordPress Updates screen. */
+							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+							self_admin_url( 'update-core.php' )
+						);
+					}
+				} elseif ( ! $theme['updateResponse']['compatiblePHP'] ) {
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of PHP.' ),
+						$theme['name']
+					);
+					if ( current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: %s: URL to Update PHP page. */
+							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					}
+				}
+				?>
+			</p></div>
 		<?php endif; ?>
-		</div>
 	<?php endif; ?>
 
+	<?php
+	if ( ! $theme['compatibleWP'] || ! $theme['compatiblePHP'] ) {
+		echo '<div class="notice inline notice-error notice-alt"><p>';
+		if ( ! $theme['compatibleWP'] && ! $theme['compatiblePHP'] ) {
+			_e( 'This theme doesn&#8217;t work with your versions of WordPress and PHP.' );
+			if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+				printf(
+					/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+					' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+					self_admin_url( 'update-core.php' ),
+					esc_url( wp_get_update_php_url() )
+				);
+				wp_update_php_annotation( '</p><p><em>', '</em>' );
+			} elseif ( current_user_can( 'update_core' ) ) {
+				printf(
+					/* translators: %s: URL to WordPress Updates screen. */
+					' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+					self_admin_url( 'update-core.php' )
+				);
+			} elseif ( current_user_can( 'update_php' ) ) {
+				printf(
+					/* translators: %s: URL to Update PHP page. */
+					' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+					esc_url( wp_get_update_php_url() )
+				);
+				wp_update_php_annotation( '</p><p><em>', '</em>' );
+			}
+		} elseif ( ! $theme['compatibleWP'] ) {
+			_e( 'This theme doesn&#8217;t work with your version of WordPress.' );
+			if ( current_user_can( 'update_core' ) ) {
+				printf(
+					/* translators: %s: URL to WordPress Updates screen. */
+					' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+					self_admin_url( 'update-core.php' )
+				);
+			}
+		} elseif ( ! $theme['compatiblePHP'] ) {
+			_e( 'This theme doesn&#8217;t work with your version of PHP.' );
+			if ( current_user_can( 'update_php' ) ) {
+				printf(
+					/* translators: %s: URL to Update PHP page. */
+					' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+					esc_url( wp_get_update_php_url() )
+				);
+				wp_update_php_annotation( '</p><p><em>', '</em>' );
+			}
+		}
+		echo '</p></div>';
+	}
+	?>
+
 	<span class="more-details" id="<?php echo $aria_action; ?>"><?php _e( 'Theme Details' ); ?></span>
-	<div class="theme-author"><?php printf( __( 'By %s' ), $theme['author'] ); ?></div>
+	<div class="theme-author">
+		<?php
+		/* translators: %s: Theme author name. */
+		printf( __( 'By %s' ), $theme['author'] );
+		?>
+	</div>
 
 	<div class="theme-id-container">
 		<?php if ( $theme['active'] ) { ?>
 			<h2 class="theme-name" id="<?php echo $aria_name; ?>">
-				<?php
-				/* translators: %s: theme name */
-				printf( __( '<span>Active:</span> %s' ), $theme['name'] );
-				?>
+				<span><?php _ex( 'Active:', 'theme' ); ?></span> <?php echo $theme['name']; ?>
 			</h2>
 		<?php } else { ?>
 			<h2 class="theme-name" id="<?php echo $aria_name; ?>"><?php echo $theme['name']; ?></h2>
@@ -345,15 +534,24 @@
 			<?php if ( $theme['actions']['customize'] && current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) { ?>
 				<a class="button button-primary customize load-customize hide-if-no-customize" href="<?php echo $theme['actions']['customize']; ?>"><?php _e( 'Customize' ); ?></a>
 			<?php } ?>
-		<?php } else { ?>
+		<?php } elseif ( $theme['compatibleWP'] && $theme['compatiblePHP'] ) { ?>
 			<?php
-			/* translators: %s: Theme name */
+			/* translators: %s: Theme name. */
 			$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
 			?>
 			<a class="button activate" href="<?php echo $theme['actions']['activate']; ?>" aria-label="<?php echo esc_attr( $aria_label ); ?>"><?php _e( 'Activate' ); ?></a>
 			<?php if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) { ?>
 				<a class="button button-primary load-customize hide-if-no-customize" href="<?php echo $theme['actions']['customize']; ?>"><?php _e( 'Live Preview' ); ?></a>
 			<?php } ?>
+		<?php } else { ?>
+			<?php
+			/* translators: %s: Theme name. */
+			$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
+			?>
+			<a class="button disabled" aria-label="<?php echo esc_attr( $aria_label ); ?>"><?php _ex( 'Cannot Activate', 'theme' ); ?></a>
+			<?php if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) { ?>
+				<a class="button button-primary hide-if-no-customize disabled"><?php _e( 'Live Preview' ); ?></a>
+			<?php } ?>
 		<?php } ?>
 
 		</div>
@@ -368,7 +566,8 @@
 
 <?php
 // List broken themes, if any.
-if ( ! is_multisite() && current_user_can( 'edit_themes' ) && $broken_themes = wp_get_themes( array( 'errors' => true ) ) ) {
+$broken_themes = wp_get_themes( array( 'errors' => true ) );
+if ( ! is_multisite() && $broken_themes ) {
 	?>
 
 <div class="broken-themes">
@@ -396,7 +595,7 @@
 	</tr>
 	<?php foreach ( $broken_themes as $broken_theme ) : ?>
 		<tr>
-			<td><?php echo $broken_theme->get( 'Name' ) ? $broken_theme->display( 'Name' ) : $broken_theme->get_stylesheet(); ?></td>
+			<td><?php echo $broken_theme->get( 'Name' ) ? $broken_theme->display( 'Name' ) : esc_html( $broken_theme->get_stylesheet() ); ?></td>
 			<td><?php echo $broken_theme->errors()->get_error_message(); ?></td>
 			<?php
 			if ( $can_resume ) {
@@ -465,6 +664,56 @@
 </div><!-- .wrap -->
 
 <?php
+
+/**
+ * Returns the JavaScript template used to display the auto-update setting for a theme.
+ *
+ * @since 5.5.0
+ *
+ * @return string The template for displaying the auto-update setting link.
+ */
+function wp_theme_auto_update_setting_template() {
+	$template = '
+		<div class="theme-autoupdate">
+			<# if ( data.autoupdate.supported ) { #>
+				<# if ( data.autoupdate.forced === false ) { #>
+					' . __( 'Auto-updates disabled' ) . '
+				<# } else if ( data.autoupdate.forced ) { #>
+					' . __( 'Auto-updates enabled' ) . '
+				<# } else if ( data.autoupdate.enabled ) { #>
+					<button type="button" class="toggle-auto-update button-link" data-slug="{{ data.id }}" data-wp-action="disable">
+						<span class="dashicons dashicons-update spin hidden" aria-hidden="true"></span><span class="label">' . __( 'Disable auto-updates' ) . '</span>
+					</button>
+				<# } else { #>
+					<button type="button" class="toggle-auto-update button-link" data-slug="{{ data.id }}" data-wp-action="enable">
+						<span class="dashicons dashicons-update spin hidden" aria-hidden="true"></span><span class="label">' . __( 'Enable auto-updates' ) . '</span>
+					</button>
+				<# } #>
+			<# } #>
+			<# if ( data.hasUpdate ) { #>
+				<# if ( data.autoupdate.supported && data.autoupdate.enabled ) { #>
+					<span class="auto-update-time">
+				<# } else { #>
+					<span class="auto-update-time hidden">
+				<# } #>
+				<br />' . wp_get_auto_update_message() . '</span>
+			<# } #>
+			<div class="notice notice-error notice-alt inline hidden"><p></p></div>
+		</div>
+	';
+
+	/**
+	 * Filters the JavaScript template used to display the auto-update setting for a theme (in the overlay).
+	 *
+	 * See {@see wp_prepare_themes_for_js()} for the properties of the `data` object.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param string $template The template for displaying the auto-update setting link.
+	 */
+	return apply_filters( 'theme_auto_update_setting_template', $template );
+}
+
 /*
  * The tmpl-theme template is synchronized with PHP above!
  */
@@ -479,17 +728,141 @@
 	<# } #>
 
 	<# if ( data.hasUpdate ) { #>
-		<# if ( data.hasPackage ) { #>
-			<div class="update-message notice inline notice-warning notice-alt"><p><?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?></p></div>
+		<# if ( data.updateResponse.compatibleWP && data.updateResponse.compatiblePHP ) { #>
+			<div class="update-message notice inline notice-warning notice-alt"><p>
+				<# if ( data.hasPackage ) { #>
+					<?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?>
+				<# } else { #>
+					<?php _e( 'New version available.' ); ?>
+				<# } #>
+			</p></div>
 		<# } else { #>
-			<div class="update-message notice inline notice-warning notice-alt"><p><?php _e( 'New version available.' ); ?></p></div>
+			<div class="update-message notice inline notice-error notice-alt"><p>
+				<# if ( ! data.updateResponse.compatibleWP && ! data.updateResponse.compatiblePHP ) { #>
+					<?php
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your versions of WordPress and PHP.' ),
+						'{{{ data.name }}}'
+					);
+					if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+							' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+							self_admin_url( 'update-core.php' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					} elseif ( current_user_can( 'update_core' ) ) {
+						printf(
+							/* translators: %s: URL to WordPress Updates screen. */
+							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+							self_admin_url( 'update-core.php' )
+						);
+					} elseif ( current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: %s: URL to Update PHP page. */
+							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					}
+					?>
+				<# } else if ( ! data.updateResponse.compatibleWP ) { #>
+					<?php
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of WordPress.' ),
+						'{{{ data.name }}}'
+					);
+					if ( current_user_can( 'update_core' ) ) {
+						printf(
+							/* translators: %s: URL to WordPress Updates screen. */
+							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+							self_admin_url( 'update-core.php' )
+						);
+					}
+					?>
+				<# } else if ( ! data.updateResponse.compatiblePHP ) { #>
+					<?php
+					printf(
+						/* translators: %s: Theme name. */
+						__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of PHP.' ),
+						'{{{ data.name }}}'
+					);
+					if ( current_user_can( 'update_php' ) ) {
+						printf(
+							/* translators: %s: URL to Update PHP page. */
+							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+							esc_url( wp_get_update_php_url() )
+						);
+						wp_update_php_annotation( '</p><p><em>', '</em>' );
+					}
+					?>
+				<# } #>
+			</p></div>
 		<# } #>
 	<# } #>
 
+	<# if ( ! data.compatibleWP || ! data.compatiblePHP ) { #>
+		<div class="notice notice-error notice-alt"><p>
+			<# if ( ! data.compatibleWP && ! data.compatiblePHP ) { #>
+				<?php
+				_e( 'This theme doesn&#8217;t work with your versions of WordPress and PHP.' );
+				if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+					printf(
+						/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+						' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+						self_admin_url( 'update-core.php' ),
+						esc_url( wp_get_update_php_url() )
+					);
+					wp_update_php_annotation( '</p><p><em>', '</em>' );
+				} elseif ( current_user_can( 'update_core' ) ) {
+					printf(
+						/* translators: %s: URL to WordPress Updates screen. */
+						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+						self_admin_url( 'update-core.php' )
+					);
+				} elseif ( current_user_can( 'update_php' ) ) {
+					printf(
+						/* translators: %s: URL to Update PHP page. */
+						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+						esc_url( wp_get_update_php_url() )
+					);
+					wp_update_php_annotation( '</p><p><em>', '</em>' );
+				}
+				?>
+			<# } else if ( ! data.compatibleWP ) { #>
+				<?php
+				_e( 'This theme doesn&#8217;t work with your version of WordPress.' );
+				if ( current_user_can( 'update_core' ) ) {
+					printf(
+						/* translators: %s: URL to WordPress Updates screen. */
+						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+						self_admin_url( 'update-core.php' )
+					);
+				}
+				?>
+			<# } else if ( ! data.compatiblePHP ) { #>
+				<?php
+				_e( 'This theme doesn&#8217;t work with your version of PHP.' );
+				if ( current_user_can( 'update_php' ) ) {
+					printf(
+						/* translators: %s: URL to Update PHP page. */
+						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+						esc_url( wp_get_update_php_url() )
+					);
+					wp_update_php_annotation( '</p><p><em>', '</em>' );
+				}
+				?>
+			<# } #>
+		</p></div>
+	<# } #>
+
 	<span class="more-details" id="{{ data.id }}-action"><?php _e( 'Theme Details' ); ?></span>
 	<div class="theme-author">
 		<?php
-		/* translators: %s: Theme author name */
+		/* translators: %s: Theme author name. */
 		printf( __( 'By %s' ), '{{{ data.author }}}' );
 		?>
 	</div>
@@ -497,10 +870,7 @@
 	<div class="theme-id-container">
 		<# if ( data.active ) { #>
 			<h2 class="theme-name" id="{{ data.id }}-name">
-				<?php
-				/* translators: %s: Theme name */
-				printf( __( '<span>Active:</span> %s' ), '{{{ data.name }}}' );
-				?>
+				<span><?php _ex( 'Active:', 'theme' ); ?></span> {{{ data.name }}}
 			</h2>
 		<# } else { #>
 			<h2 class="theme-name" id="{{ data.id }}-name">{{{ data.name }}}</h2>
@@ -512,12 +882,21 @@
 					<a class="button button-primary customize load-customize hide-if-no-customize" href="{{{ data.actions.customize }}}"><?php _e( 'Customize' ); ?></a>
 				<# } #>
 			<# } else { #>
-				<?php
-				/* translators: %s: Theme name */
-				$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
-				?>
-				<a class="button activate" href="{{{ data.actions.activate }}}" aria-label="<?php echo $aria_label; ?>"><?php _e( 'Activate' ); ?></a>
-				<a class="button button-primary load-customize hide-if-no-customize" href="{{{ data.actions.customize }}}"><?php _e( 'Live Preview' ); ?></a>
+				<# if ( data.compatibleWP && data.compatiblePHP ) { #>
+					<?php
+					/* translators: %s: Theme name. */
+					$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
+					?>
+					<a class="button activate" href="{{{ data.actions.activate }}}" aria-label="<?php echo $aria_label; ?>"><?php _e( 'Activate' ); ?></a>
+					<a class="button button-primary load-customize hide-if-no-customize" href="{{{ data.actions.customize }}}"><?php _e( 'Live Preview' ); ?></a>
+				<# } else { #>
+					<?php
+					/* translators: %s: Theme name. */
+					$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
+					?>
+					<a class="button disabled" aria-label="<?php echo esc_attr( $aria_label ); ?>"><?php _ex( 'Cannot Activate', 'theme' ); ?></a>
+					<a class="button button-primary hide-if-no-customize disabled"><?php _e( 'Live Preview' ); ?></a>
+				<# } #>
 			<# } #>
 		</div>
 	</div>
@@ -544,19 +923,164 @@
 				<# if ( data.active ) { #>
 					<span class="current-label"><?php _e( 'Current Theme' ); ?></span>
 				<# } #>
-				<h2 class="theme-name">{{{ data.name }}}<span class="theme-version"><?php printf( __( 'Version: %s' ), '{{ data.version }}' ); ?></span></h2>
-				<p class="theme-author"><?php printf( __( 'By %s' ), '{{{ data.authorAndUri }}}' ); ?></p>
+				<h2 class="theme-name">{{{ data.name }}}<span class="theme-version">
+					<?php
+					/* translators: %s: Theme version. */
+					printf( __( 'Version: %s' ), '{{ data.version }}' );
+					?>
+				</span></h2>
+				<p class="theme-author">
+					<?php
+					/* translators: %s: Theme author link. */
+					printf( __( 'By %s' ), '{{{ data.authorAndUri }}}' );
+					?>
+				</p>
+
+				<# if ( ! data.compatibleWP || ! data.compatiblePHP ) { #>
+					<div class="notice notice-error notice-alt notice-large"><p>
+						<# if ( ! data.compatibleWP && ! data.compatiblePHP ) { #>
+							<?php
+							_e( 'This theme doesn&#8217;t work with your versions of WordPress and PHP.' );
+							if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+								printf(
+									/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+									' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+									self_admin_url( 'update-core.php' ),
+									esc_url( wp_get_update_php_url() )
+								);
+								wp_update_php_annotation( '</p><p><em>', '</em>' );
+							} elseif ( current_user_can( 'update_core' ) ) {
+								printf(
+									/* translators: %s: URL to WordPress Updates screen. */
+									' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+									self_admin_url( 'update-core.php' )
+								);
+							} elseif ( current_user_can( 'update_php' ) ) {
+								printf(
+									/* translators: %s: URL to Update PHP page. */
+									' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+									esc_url( wp_get_update_php_url() )
+								);
+								wp_update_php_annotation( '</p><p><em>', '</em>' );
+							}
+							?>
+						<# } else if ( ! data.compatibleWP ) { #>
+							<?php
+							_e( 'This theme doesn&#8217;t work with your version of WordPress.' );
+							if ( current_user_can( 'update_core' ) ) {
+								printf(
+									/* translators: %s: URL to WordPress Updates screen. */
+									' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+									self_admin_url( 'update-core.php' )
+								);
+							}
+							?>
+						<# } else if ( ! data.compatiblePHP ) { #>
+							<?php
+							_e( 'This theme doesn&#8217;t work with your version of PHP.' );
+							if ( current_user_can( 'update_php' ) ) {
+								printf(
+									/* translators: %s: URL to Update PHP page. */
+									' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+									esc_url( wp_get_update_php_url() )
+								);
+								wp_update_php_annotation( '</p><p><em>', '</em>' );
+							}
+							?>
+						<# } #>
+					</p></div>
+				<# } #>
 
 				<# if ( data.hasUpdate ) { #>
-				<div class="notice notice-warning notice-alt notice-large">
-					<h3 class="notice-title"><?php _e( 'Update Available' ); ?></h3>
-					{{{ data.update }}}
-				</div>
+					<# if ( data.updateResponse.compatibleWP && data.updateResponse.compatiblePHP ) { #>
+						<div class="notice notice-warning notice-alt notice-large">
+							<h3 class="notice-title"><?php _e( 'Update Available' ); ?></h3>
+							{{{ data.update }}}
+						</div>
+					<# } else { #>
+						<div class="notice notice-error notice-alt notice-large">
+							<h3 class="notice-title"><?php _e( 'Update Incompatible' ); ?></h3>
+							<p>
+								<# if ( ! data.updateResponse.compatibleWP && ! data.updateResponse.compatiblePHP ) { #>
+									<?php
+									printf(
+										/* translators: %s: Theme name. */
+										__( 'There is a new version of %s available, but it doesn&#8217;t work with your versions of WordPress and PHP.' ),
+										'{{{ data.name }}}'
+									);
+									if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
+										printf(
+											/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
+											' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
+											self_admin_url( 'update-core.php' ),
+											esc_url( wp_get_update_php_url() )
+										);
+										wp_update_php_annotation( '</p><p><em>', '</em>' );
+									} elseif ( current_user_can( 'update_core' ) ) {
+										printf(
+											/* translators: %s: URL to WordPress Updates screen. */
+											' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+											self_admin_url( 'update-core.php' )
+										);
+									} elseif ( current_user_can( 'update_php' ) ) {
+										printf(
+											/* translators: %s: URL to Update PHP page. */
+											' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+											esc_url( wp_get_update_php_url() )
+										);
+										wp_update_php_annotation( '</p><p><em>', '</em>' );
+									}
+									?>
+								<# } else if ( ! data.updateResponse.compatibleWP ) { #>
+									<?php
+									printf(
+										/* translators: %s: Theme name. */
+										__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of WordPress.' ),
+										'{{{ data.name }}}'
+									);
+									if ( current_user_can( 'update_core' ) ) {
+										printf(
+											/* translators: %s: URL to WordPress Updates screen. */
+											' ' . __( '<a href="%s">Please update WordPress</a>.' ),
+											self_admin_url( 'update-core.php' )
+										);
+									}
+									?>
+								<# } else if ( ! data.updateResponse.compatiblePHP ) { #>
+									<?php
+									printf(
+										/* translators: %s: Theme name. */
+										__( 'There is a new version of %s available, but it doesn&#8217;t work with your version of PHP.' ),
+										'{{{ data.name }}}'
+									);
+									if ( current_user_can( 'update_php' ) ) {
+										printf(
+											/* translators: %s: URL to Update PHP page. */
+											' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
+											esc_url( wp_get_update_php_url() )
+										);
+										wp_update_php_annotation( '</p><p><em>', '</em>' );
+									}
+									?>
+								<# } #>
+							</p>
+						</div>
+					<# } #>
 				<# } #>
+
+				<# if ( data.actions.autoupdate ) { #>
+					<?php echo wp_theme_auto_update_setting_template(); ?>
+				<# } #>
+
 				<p class="theme-description">{{{ data.description }}}</p>
 
 				<# if ( data.parent ) { #>
-					<p class="parent-theme"><?php printf( __( 'This is a child theme of %s.' ), '<strong>{{{ data.parent }}}</strong>' ); ?></p>
+					<p class="parent-theme">
+						<?php
+						/* translators: %s: Theme name. */
+						printf( __( 'This is a child theme of %s.' ), '<strong>{{{ data.parent }}}</strong>' );
+						?>
+					</p>
 				<# } #>
 
 				<# if ( data.tags ) { #>
@@ -571,14 +1095,25 @@
 				<?php echo implode( ' ', $current_theme_actions ); ?>
 			</div>
 			<div class="inactive-theme">
-				<?php
-				/* translators: %s: Theme name */
-				$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
-				?>
-				<# if ( data.actions.activate ) { #>
-					<a href="{{{ data.actions.activate }}}" class="button activate" aria-label="<?php echo $aria_label; ?>"><?php _e( 'Activate' ); ?></a>
+				<# if ( data.compatibleWP && data.compatiblePHP ) { #>
+					<?php
+					/* translators: %s: Theme name. */
+					$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
+					?>
+					<# if ( data.actions.activate ) { #>
+						<a href="{{{ data.actions.activate }}}" class="button activate" aria-label="<?php echo $aria_label; ?>"><?php _e( 'Activate' ); ?></a>
+					<# } #>
+					<a href="{{{ data.actions.customize }}}" class="button button-primary load-customize hide-if-no-customize"><?php _e( 'Live Preview' ); ?></a>
+				<# } else { #>
+					<?php
+					/* translators: %s: Theme name. */
+					$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
+					?>
+					<# if ( data.actions.activate ) { #>
+						<a class="button disabled" aria-label="<?php echo $aria_label; ?>"><?php _ex( 'Cannot Activate', 'theme' ); ?></a>
+					<# } #>
+					<a class="button button-primary hide-if-no-customize disabled"><?php _e( 'Live Preview' ); ?></a>
 				<# } #>
-				<a href="{{{ data.actions.customize }}}" class="button button-primary load-customize hide-if-no-customize"><?php _e( 'Live Preview' ); ?></a>
 			</div>
 
 			<# if ( ! data.active && data.actions['delete'] ) { #>
@@ -601,4 +1136,4 @@
 	)
 );
 
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require_once ABSPATH . 'wp-admin/admin-footer.php';