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class-wp-automatic-updater.php (50462B)

---

 <?php
 /**
  * Upgrade API: WP_Automatic_Updater class
  *
  * @package WordPress
  * @subpackage Upgrader
  * @since 4.6.0
  */
 
 /**
  * Core class used for handling automatic background updates.
  *
  * @since 3.7.0
  * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
  */
 class WP_Automatic_Updater {
 
 	/**
 	 * Tracks update results during processing.
 	 *
 	 * @var array
 	 */
 	protected $update_results = array();
 
 	/**
 	 * Whether the entire automatic updater is disabled.
 	 *
 	 * @since 3.7.0
 	 */
 	public function is_disabled() {
 		// Background updates are disabled if you don't want file changes.
 		if ( ! wp_is_file_mod_allowed( 'automatic_updater' ) ) {
 			return true;
 		}
 
 		if ( wp_installing() ) {
 			return true;
 		}
 
 		// More fine grained control can be done through the WP_AUTO_UPDATE_CORE constant and filters.
 		$disabled = defined( 'AUTOMATIC_UPDATER_DISABLED' ) && AUTOMATIC_UPDATER_DISABLED;
 
 		/**
 		 * Filters whether to entirely disable background updates.
 		 *
 		 * There are more fine-grained filters and controls for selective disabling.
 		 * This filter parallels the AUTOMATIC_UPDATER_DISABLED constant in name.
 		 *
 		 * This also disables update notification emails. That may change in the future.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param bool $disabled Whether the updater should be disabled.
 		 */
 		return apply_filters( 'automatic_updater_disabled', $disabled );
 	}
 
 	/**
 	 * Check for version control checkouts.
 	 *
 	 * Checks for Subversion, Git, Mercurial, and Bazaar. It recursively looks up the
 	 * filesystem to the top of the drive, erring on the side of detecting a VCS
 	 * checkout somewhere.
 	 *
 	 * ABSPATH is always checked in addition to whatever `$context` is (which may be the
 	 * wp-content directory, for example). The underlying assumption is that if you are
 	 * using version control *anywhere*, then you should be making decisions for
 	 * how things get updated.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param string $context The filesystem path to check, in addition to ABSPATH.
 	 * @return bool True if a VCS checkout was discovered at `$context` or ABSPATH,
 	 *              or anywhere higher. False otherwise.
 	 */
 	public function is_vcs_checkout( $context ) {
 		$context_dirs = array( untrailingslashit( $context ) );
 		if ( ABSPATH !== $context ) {
 			$context_dirs[] = untrailingslashit( ABSPATH );
 		}
 
 		$vcs_dirs   = array( '.svn', '.git', '.hg', '.bzr' );
 		$check_dirs = array();
 
 		foreach ( $context_dirs as $context_dir ) {
 			// Walk up from $context_dir to the root.
 			do {
 				$check_dirs[] = $context_dir;
 
 				// Once we've hit '/' or 'C:\', we need to stop. dirname will keep returning the input here.
 				if ( dirname( $context_dir ) === $context_dir ) {
 					break;
 				}
 
 				// Continue one level at a time.
 			} while ( $context_dir = dirname( $context_dir ) );
 		}
 
 		$check_dirs = array_unique( $check_dirs );
 
 		// Search all directories we've found for evidence of version control.
 		foreach ( $vcs_dirs as $vcs_dir ) {
 			foreach ( $check_dirs as $check_dir ) {
 				$checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" );
 				if ( $checkout ) {
 					break 2;
 				}
 			}
 		}
 
 		/**
 		 * Filters whether the automatic updater should consider a filesystem
 		 * location to be potentially managed by a version control system.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param bool $checkout  Whether a VCS checkout was discovered at `$context`
 		 *                        or ABSPATH, or anywhere higher.
 		 * @param string $context The filesystem context (a path) against which
 		 *                        filesystem status should be checked.
 		 */
 		return apply_filters( 'automatic_updates_is_vcs_checkout', $checkout, $context );
 	}
 
 	/**
 	 * Tests to see if we can and should update a specific item.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param string $type    The type of update being checked: 'core', 'theme',
 	 *                        'plugin', 'translation'.
 	 * @param object $item    The update offer.
 	 * @param string $context The filesystem context (a path) against which filesystem
 	 *                        access and status should be checked.
 	 * @return bool True if the item should be updated, false otherwise.
 	 */
 	public function should_update( $type, $item, $context ) {
 		// Used to see if WP_Filesystem is set up to allow unattended updates.
 		$skin = new Automatic_Upgrader_Skin;
 
 		if ( $this->is_disabled() ) {
 			return false;
 		}
 
 		// Only relax the filesystem checks when the update doesn't include new files.
 		$allow_relaxed_file_ownership = false;
 		if ( 'core' === $type && isset( $item->new_files ) && ! $item->new_files ) {
 			$allow_relaxed_file_ownership = true;
 		}
 
 		// If we can't do an auto core update, we may still be able to email the user.
 		if ( ! $skin->request_filesystem_credentials( false, $context, $allow_relaxed_file_ownership )
 			|| $this->is_vcs_checkout( $context )
 		) {
 			if ( 'core' === $type ) {
 				$this->send_core_update_notification_email( $item );
 			}
 			return false;
 		}
 
 		// Next up, is this an item we can update?
 		if ( 'core' === $type ) {
 			$update = Core_Upgrader::should_update_to_version( $item->current );
 		} elseif ( 'plugin' === $type || 'theme' === $type ) {
 			$update = ! empty( $item->autoupdate );
 
 			if ( ! $update && wp_is_auto_update_enabled_for_type( $type ) ) {
 				// Check if the site admin has enabled auto-updates by default for the specific item.
 				$auto_updates = (array) get_site_option( "auto_update_{$type}s", array() );
 				$update       = in_array( $item->{$type}, $auto_updates, true );
 			}
 		} else {
 			$update = ! empty( $item->autoupdate );
 		}
 
 		// If the `disable_autoupdate` flag is set, override any user-choice, but allow filters.
 		if ( ! empty( $item->disable_autoupdate ) ) {
 			$update = $item->disable_autoupdate;
 		}
 
 		/**
 		 * Filters whether to automatically update core, a plugin, a theme, or a language.
 		 *
 		 * The dynamic portion of the hook name, `$type`, refers to the type of update
 		 * being checked.
 		 *
 		 * Possible hook names include:
 		 *
 		 *  - `auto_update_core`
 		 *  - `auto_update_plugin`
 		 *  - `auto_update_theme`
 		 *  - `auto_update_translation`
 		 *
 		 * Generally speaking, plugins, themes, and major core versions are not updated
 		 * by default, while translations and minor and development versions for core
 		 * are updated by default.
 		 *
 		 * See the {@see 'allow_dev_auto_core_updates'}, {@see 'allow_minor_auto_core_updates'},
 		 * and {@see 'allow_major_auto_core_updates'} filters for a more straightforward way to
 		 * adjust core updates.
 		 *
 		 * @since 3.7.0
 		 * @since 5.5.0 The `$update` parameter accepts the value of null.
 		 *
 		 * @param bool|null $update Whether to update. The value of null is internally used
 		 *                          to detect whether nothing has hooked into this filter.
 		 * @param object    $item   The update offer.
 		 */
 		$update = apply_filters( "auto_update_{$type}", $update, $item );
 
 		if ( ! $update ) {
 			if ( 'core' === $type ) {
 				$this->send_core_update_notification_email( $item );
 			}
 			return false;
 		}
 
 		// If it's a core update, are we actually compatible with its requirements?
 		if ( 'core' === $type ) {
 			global $wpdb;
 
 			$php_compat = version_compare( phpversion(), $item->php_version, '>=' );
 			if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {
 				$mysql_compat = true;
 			} else {
 				$mysql_compat = version_compare( $wpdb->db_version(), $item->mysql_version, '>=' );
 			}
 
 			if ( ! $php_compat || ! $mysql_compat ) {
 				return false;
 			}
 		}
 
 		// If updating a plugin or theme, ensure the minimum PHP version requirements are satisfied.
 		if ( in_array( $type, array( 'plugin', 'theme' ), true ) ) {
 			if ( ! empty( $item->requires_php ) && version_compare( phpversion(), $item->requires_php, '<' ) ) {
 				return false;
 			}
 		}
 
 		return true;
 	}
 
 	/**
 	 * Notifies an administrator of a core update.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param object $item The update offer.
 	 * @return bool True if the site administrator is notified of a core update,
 	 *              false otherwise.
 	 */
 	protected function send_core_update_notification_email( $item ) {
 		$notified = get_site_option( 'auto_core_update_notified' );
 
 		// Don't notify if we've already notified the same email address of the same version.
 		if ( $notified
 			&& get_site_option( 'admin_email' ) === $notified['email']
 			&& $notified['version'] === $item->current
 		) {
 			return false;
 		}
 
 		// See if we need to notify users of a core update.
 		$notify = ! empty( $item->notify_email );
 
 		/**
 		 * Filters whether to notify the site administrator of a new core update.
 		 *
 		 * By default, administrators are notified when the update offer received
 		 * from WordPress.org sets a particular flag. This allows some discretion
 		 * in if and when to notify.
 		 *
 		 * This filter is only evaluated once per release. If the same email address
 		 * was already notified of the same new version, WordPress won't repeatedly
 		 * email the administrator.
 		 *
 		 * This filter is also used on about.php to check if a plugin has disabled
 		 * these notifications.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param bool   $notify Whether the site administrator is notified.
 		 * @param object $item   The update offer.
 		 */
 		if ( ! apply_filters( 'send_core_update_notification_email', $notify, $item ) ) {
 			return false;
 		}
 
 		$this->send_email( 'manual', $item );
 		return true;
 	}
 
 	/**
 	 * Update an item, if appropriate.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param string $type The type of update being checked: 'core', 'theme', 'plugin', 'translation'.
 	 * @param object $item The update offer.
 	 * @return null|WP_Error
 	 */
 	public function update( $type, $item ) {
 		$skin = new Automatic_Upgrader_Skin;
 
 		switch ( $type ) {
 			case 'core':
 				// The Core upgrader doesn't use the Upgrader's skin during the actual main part of the upgrade, instead, firing a filter.
 				add_filter( 'update_feedback', array( $skin, 'feedback' ) );
 				$upgrader = new Core_Upgrader( $skin );
 				$context  = ABSPATH;
 				break;
 			case 'plugin':
 				$upgrader = new Plugin_Upgrader( $skin );
 				$context  = WP_PLUGIN_DIR; // We don't support custom Plugin directories, or updates for WPMU_PLUGIN_DIR.
 				break;
 			case 'theme':
 				$upgrader = new Theme_Upgrader( $skin );
 				$context  = get_theme_root( $item->theme );
 				break;
 			case 'translation':
 				$upgrader = new Language_Pack_Upgrader( $skin );
 				$context  = WP_CONTENT_DIR; // WP_LANG_DIR;
 				break;
 		}
 
 		// Determine whether we can and should perform this update.
 		if ( ! $this->should_update( $type, $item, $context ) ) {
 			return false;
 		}
 
 		/**
 		 * Fires immediately prior to an auto-update.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @param string $type    The type of update being checked: 'core', 'theme', 'plugin', or 'translation'.
 		 * @param object $item    The update offer.
 		 * @param string $context The filesystem context (a path) against which filesystem access and status
 		 *                        should be checked.
 		 */
 		do_action( 'pre_auto_update', $type, $item, $context );
 
 		$upgrader_item = $item;
 		switch ( $type ) {
 			case 'core':
 				/* translators: %s: WordPress version. */
 				$skin->feedback( __( 'Updating to WordPress %s' ), $item->version );
 				/* translators: %s: WordPress version. */
 				$item_name = sprintf( __( 'WordPress %s' ), $item->version );
 				break;
 			case 'theme':
 				$upgrader_item = $item->theme;
 				$theme         = wp_get_theme( $upgrader_item );
 				$item_name     = $theme->Get( 'Name' );
 				// Add the current version so that it can be reported in the notification email.
 				$item->current_version = $theme->get( 'Version' );
 				if ( empty( $item->current_version ) ) {
 					$item->current_version = false;
 				}
 				/* translators: %s: Theme name. */
 				$skin->feedback( __( 'Updating theme: %s' ), $item_name );
 				break;
 			case 'plugin':
 				$upgrader_item = $item->plugin;
 				$plugin_data   = get_plugin_data( $context . '/' . $upgrader_item );
 				$item_name     = $plugin_data['Name'];
 				// Add the current version so that it can be reported in the notification email.
 				$item->current_version = $plugin_data['Version'];
 				if ( empty( $item->current_version ) ) {
 					$item->current_version = false;
 				}
 				/* translators: %s: Plugin name. */
 				$skin->feedback( __( 'Updating plugin: %s' ), $item_name );
 				break;
 			case 'translation':
 				$language_item_name = $upgrader->get_name_for_update( $item );
 				/* translators: %s: Project name (plugin, theme, or WordPress). */
 				$item_name = sprintf( __( 'Translations for %s' ), $language_item_name );
 				/* translators: 1: Project name (plugin, theme, or WordPress), 2: Language. */
 				$skin->feedback( sprintf( __( 'Updating translations for %1$s (%2$s)&#8230;' ), $language_item_name, $item->language ) );
 				break;
 		}
 
 		$allow_relaxed_file_ownership = false;
 		if ( 'core' === $type && isset( $item->new_files ) && ! $item->new_files ) {
 			$allow_relaxed_file_ownership = true;
 		}
 
 		// Boom, this site's about to get a whole new splash of paint!
 		$upgrade_result = $upgrader->upgrade(
 			$upgrader_item,
 			array(
 				'clear_update_cache'           => false,
 				// Always use partial builds if possible for core updates.
 				'pre_check_md5'                => false,
 				// Only available for core updates.
 				'attempt_rollback'             => true,
 				// Allow relaxed file ownership in some scenarios.
 				'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership,
 			)
 		);
 
 		// If the filesystem is unavailable, false is returned.
 		if ( false === $upgrade_result ) {
 			$upgrade_result = new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
 		}
 
 		if ( 'core' === $type ) {
 			if ( is_wp_error( $upgrade_result )
 				&& ( 'up_to_date' === $upgrade_result->get_error_code()
 					|| 'locked' === $upgrade_result->get_error_code() )
 			) {
 				// These aren't actual errors, treat it as a skipped-update instead
 				// to avoid triggering the post-core update failure routines.
 				return false;
 			}
 
 			// Core doesn't output this, so let's append it so we don't get confused.
 			if ( is_wp_error( $upgrade_result ) ) {
 				$skin->error( __( 'Installation failed.' ), $upgrade_result );
 			} else {
 				$skin->feedback( __( 'WordPress updated successfully.' ) );
 			}
 		}
 
 		$this->update_results[ $type ][] = (object) array(
 			'item'     => $item,
 			'result'   => $upgrade_result,
 			'name'     => $item_name,
 			'messages' => $skin->get_upgrade_messages(),
 		);
 
 		return $upgrade_result;
 	}
 
 	/**
 	 * Kicks off the background update process, looping through all pending updates.
 	 *
 	 * @since 3.7.0
 	 */
 	public function run() {
 		if ( $this->is_disabled() ) {
 			return;
 		}
 
 		if ( ! is_main_network() || ! is_main_site() ) {
 			return;
 		}
 
 		if ( ! WP_Upgrader::create_lock( 'auto_updater' ) ) {
 			return;
 		}
 
 		// Don't automatically run these things, as we'll handle it ourselves.
 		remove_action( 'upgrader_process_complete', array( 'Language_Pack_Upgrader', 'async_upgrade' ), 20 );
 		remove_action( 'upgrader_process_complete', 'wp_version_check' );
 		remove_action( 'upgrader_process_complete', 'wp_update_plugins' );
 		remove_action( 'upgrader_process_complete', 'wp_update_themes' );
 
 		// Next, plugins.
 		wp_update_plugins(); // Check for plugin updates.
 		$plugin_updates = get_site_transient( 'update_plugins' );
 		if ( $plugin_updates && ! empty( $plugin_updates->response ) ) {
 			foreach ( $plugin_updates->response as $plugin ) {
 				$this->update( 'plugin', $plugin );
 			}
 			// Force refresh of plugin update information.
 			wp_clean_plugins_cache();
 		}
 
 		// Next, those themes we all love.
 		wp_update_themes();  // Check for theme updates.
 		$theme_updates = get_site_transient( 'update_themes' );
 		if ( $theme_updates && ! empty( $theme_updates->response ) ) {
 			foreach ( $theme_updates->response as $theme ) {
 				$this->update( 'theme', (object) $theme );
 			}
 			// Force refresh of theme update information.
 			wp_clean_themes_cache();
 		}
 
 		// Next, process any core update.
 		wp_version_check(); // Check for core updates.
 		$core_update = find_core_auto_update();
 
 		if ( $core_update ) {
 			$this->update( 'core', $core_update );
 		}
 
 		// Clean up, and check for any pending translations.
 		// (Core_Upgrader checks for core updates.)
 		$theme_stats = array();
 		if ( isset( $this->update_results['theme'] ) ) {
 			foreach ( $this->update_results['theme'] as $upgrade ) {
 				$theme_stats[ $upgrade->item->theme ] = ( true === $upgrade->result );
 			}
 		}
 		wp_update_themes( $theme_stats ); // Check for theme updates.
 
 		$plugin_stats = array();
 		if ( isset( $this->update_results['plugin'] ) ) {
 			foreach ( $this->update_results['plugin'] as $upgrade ) {
 				$plugin_stats[ $upgrade->item->plugin ] = ( true === $upgrade->result );
 			}
 		}
 		wp_update_plugins( $plugin_stats ); // Check for plugin updates.
 
 		// Finally, process any new translations.
 		$language_updates = wp_get_translation_updates();
 		if ( $language_updates ) {
 			foreach ( $language_updates as $update ) {
 				$this->update( 'translation', $update );
 			}
 
 			// Clear existing caches.
 			wp_clean_update_cache();
 
 			wp_version_check();  // Check for core updates.
 			wp_update_themes();  // Check for theme updates.
 			wp_update_plugins(); // Check for plugin updates.
 		}
 
 		// Send debugging email to admin for all development installations.
 		if ( ! empty( $this->update_results ) ) {
 			$development_version = false !== strpos( get_bloginfo( 'version' ), '-' );
 
 			/**
 			 * Filters whether to send a debugging email for each automatic background update.
 			 *
 			 * @since 3.7.0
 			 *
 			 * @param bool $development_version By default, emails are sent if the
 			 *                                  install is a development version.
 			 *                                  Return false to avoid the email.
 			 */
 			if ( apply_filters( 'automatic_updates_send_debug_email', $development_version ) ) {
 				$this->send_debug_email();
 			}
 
 			if ( ! empty( $this->update_results['core'] ) ) {
 				$this->after_core_update( $this->update_results['core'][0] );
 			} elseif ( ! empty( $this->update_results['plugin'] ) || ! empty( $this->update_results['theme'] ) ) {
 				$this->after_plugin_theme_update( $this->update_results );
 			}
 
 			/**
 			 * Fires after all automatic updates have run.
 			 *
 			 * @since 3.8.0
 			 *
 			 * @param array $update_results The results of all attempted updates.
 			 */
 			do_action( 'automatic_updates_complete', $this->update_results );
 		}
 
 		WP_Upgrader::release_lock( 'auto_updater' );
 	}
 
 	/**
 	 * If we tried to perform a core update, check if we should send an email,
 	 * and if we need to avoid processing future updates.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param object $update_result The result of the core update. Includes the update offer and result.
 	 */
 	protected function after_core_update( $update_result ) {
 		$wp_version = get_bloginfo( 'version' );
 
 		$core_update = $update_result->item;
 		$result      = $update_result->result;
 
 		if ( ! is_wp_error( $result ) ) {
 			$this->send_email( 'success', $core_update );
 			return;
 		}
 
 		$error_code = $result->get_error_code();
 
 		// Any of these WP_Error codes are critical failures, as in they occurred after we started to copy core files.
 		// We should not try to perform a background update again until there is a successful one-click update performed by the user.
 		$critical = false;
 		if ( 'disk_full' === $error_code || false !== strpos( $error_code, '__copy_dir' ) ) {
 			$critical = true;
 		} elseif ( 'rollback_was_required' === $error_code && is_wp_error( $result->get_error_data()->rollback ) ) {
 			// A rollback is only critical if it failed too.
 			$critical        = true;
 			$rollback_result = $result->get_error_data()->rollback;
 		} elseif ( false !== strpos( $error_code, 'do_rollback' ) ) {
 			$critical = true;
 		}
 
 		if ( $critical ) {
 			$critical_data = array(
 				'attempted'  => $core_update->current,
 				'current'    => $wp_version,
 				'error_code' => $error_code,
 				'error_data' => $result->get_error_data(),
 				'timestamp'  => time(),
 				'critical'   => true,
 			);
 			if ( isset( $rollback_result ) ) {
 				$critical_data['rollback_code'] = $rollback_result->get_error_code();
 				$critical_data['rollback_data'] = $rollback_result->get_error_data();
 			}
 			update_site_option( 'auto_core_update_failed', $critical_data );
 			$this->send_email( 'critical', $core_update, $result );
 			return;
 		}
 
 		/*
 		 * Any other WP_Error code (like download_failed or files_not_writable) occurs before
 		 * we tried to copy over core files. Thus, the failures are early and graceful.
 		 *
 		 * We should avoid trying to perform a background update again for the same version.
 		 * But we can try again if another version is released.
 		 *
 		 * For certain 'transient' failures, like download_failed, we should allow retries.
 		 * In fact, let's schedule a special update for an hour from now. (It's possible
 		 * the issue could actually be on WordPress.org's side.) If that one fails, then email.
 		 */
 		$send               = true;
 		$transient_failures = array( 'incompatible_archive', 'download_failed', 'insane_distro', 'locked' );
 		if ( in_array( $error_code, $transient_failures, true ) && ! get_site_option( 'auto_core_update_failed' ) ) {
 			wp_schedule_single_event( time() + HOUR_IN_SECONDS, 'wp_maybe_auto_update' );
 			$send = false;
 		}
 
 		$notified = get_site_option( 'auto_core_update_notified' );
 
 		// Don't notify if we've already notified the same email address of the same version of the same notification type.
 		if ( $notified
 			&& 'fail' === $notified['type']
 			&& get_site_option( 'admin_email' ) === $notified['email']
 			&& $notified['version'] === $core_update->current
 		) {
 			$send = false;
 		}
 
 		update_site_option(
 			'auto_core_update_failed',
 			array(
 				'attempted'  => $core_update->current,
 				'current'    => $wp_version,
 				'error_code' => $error_code,
 				'error_data' => $result->get_error_data(),
 				'timestamp'  => time(),
 				'retry'      => in_array( $error_code, $transient_failures, true ),
 			)
 		);
 
 		if ( $send ) {
 			$this->send_email( 'fail', $core_update, $result );
 		}
 	}
 
 	/**
 	 * Sends an email upon the completion or failure of a background core update.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param string $type        The type of email to send. Can be one of 'success', 'fail', 'manual', 'critical'.
 	 * @param object $core_update The update offer that was attempted.
 	 * @param mixed  $result      Optional. The result for the core update. Can be WP_Error.
 	 */
 	protected function send_email( $type, $core_update, $result = null ) {
 		update_site_option(
 			'auto_core_update_notified',
 			array(
 				'type'      => $type,
 				'email'     => get_site_option( 'admin_email' ),
 				'version'   => $core_update->current,
 				'timestamp' => time(),
 			)
 		);
 
 		$next_user_core_update = get_preferred_from_update_core();
 
 		// If the update transient is empty, use the update we just performed.
 		if ( ! $next_user_core_update ) {
 			$next_user_core_update = $core_update;
 		}
 
 		if ( 'upgrade' === $next_user_core_update->response
 			&& version_compare( $next_user_core_update->version, $core_update->version, '>' )
 		) {
 			$newer_version_available = true;
 		} else {
 			$newer_version_available = false;
 		}
 
 		/**
 		 * Filters whether to send an email following an automatic background core update.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param bool   $send        Whether to send the email. Default true.
 		 * @param string $type        The type of email to send. Can be one of
 		 *                            'success', 'fail', 'critical'.
 		 * @param object $core_update The update offer that was attempted.
 		 * @param mixed  $result      The result for the core update. Can be WP_Error.
 		 */
 		if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) {
 			return;
 		}
 
 		switch ( $type ) {
 			case 'success': // We updated.
 				/* translators: Site updated notification email subject. 1: Site title, 2: WordPress version. */
 				$subject = __( '[%1$s] Your site has updated to WordPress %2$s' );
 				break;
 
 			case 'fail':   // We tried to update but couldn't.
 			case 'manual': // We can't update (and made no attempt).
 				/* translators: Update available notification email subject. 1: Site title, 2: WordPress version. */
 				$subject = __( '[%1$s] WordPress %2$s is available. Please update!' );
 				break;
 
 			case 'critical': // We tried to update, started to copy files, then things went wrong.
 				/* translators: Site down notification email subject. 1: Site title. */
 				$subject = __( '[%1$s] URGENT: Your site may be down due to a failed update' );
 				break;
 
 			default:
 				return;
 		}
 
 		// If the auto-update is not to the latest version, say that the current version of WP is available instead.
 		$version = 'success' === $type ? $core_update->current : $next_user_core_update->current;
 		$subject = sprintf( $subject, wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ), $version );
 
 		$body = '';
 
 		switch ( $type ) {
 			case 'success':
 				$body .= sprintf(
 					/* translators: 1: Home URL, 2: WordPress version. */
 					__( 'Howdy! Your site at %1$s has been updated automatically to WordPress %2$s.' ),
 					home_url(),
 					$core_update->current
 				);
 				$body .= "\n\n";
 				if ( ! $newer_version_available ) {
 					$body .= __( 'No further action is needed on your part.' ) . ' ';
 				}
 
 				// Can only reference the About screen if their update was successful.
 				list( $about_version ) = explode( '-', $core_update->current, 2 );
 				/* translators: %s: WordPress version. */
 				$body .= sprintf( __( 'For more on version %s, see the About WordPress screen:' ), $about_version );
 				$body .= "\n" . admin_url( 'about.php' );
 
 				if ( $newer_version_available ) {
 					/* translators: %s: WordPress latest version. */
 					$body .= "\n\n" . sprintf( __( 'WordPress %s is also now available.' ), $next_user_core_update->current ) . ' ';
 					$body .= __( 'Updating is easy and only takes a few moments:' );
 					$body .= "\n" . network_admin_url( 'update-core.php' );
 				}
 
 				break;
 
 			case 'fail':
 			case 'manual':
 				$body .= sprintf(
 					/* translators: 1: Home URL, 2: WordPress version. */
 					__( 'Please update your site at %1$s to WordPress %2$s.' ),
 					home_url(),
 					$next_user_core_update->current
 				);
 
 				$body .= "\n\n";
 
 				// Don't show this message if there is a newer version available.
 				// Potential for confusion, and also not useful for them to know at this point.
 				if ( 'fail' === $type && ! $newer_version_available ) {
 					$body .= __( 'We tried but were unable to update your site automatically.' ) . ' ';
 				}
 
 				$body .= __( 'Updating is easy and only takes a few moments:' );
 				$body .= "\n" . network_admin_url( 'update-core.php' );
 				break;
 
 			case 'critical':
 				if ( $newer_version_available ) {
 					$body .= sprintf(
 						/* translators: 1: Home URL, 2: WordPress version. */
 						__( 'Your site at %1$s experienced a critical failure while trying to update WordPress to version %2$s.' ),
 						home_url(),
 						$core_update->current
 					);
 				} else {
 					$body .= sprintf(
 						/* translators: 1: Home URL, 2: WordPress latest version. */
 						__( 'Your site at %1$s experienced a critical failure while trying to update to the latest version of WordPress, %2$s.' ),
 						home_url(),
 						$core_update->current
 					);
 				}
 
 				$body .= "\n\n" . __( "This means your site may be offline or broken. Don't panic; this can be fixed." );
 
 				$body .= "\n\n" . __( "Please check out your site now. It's possible that everything is working. If it says you need to update, you should do so:" );
 				$body .= "\n" . network_admin_url( 'update-core.php' );
 				break;
 		}
 
 		$critical_support = 'critical' === $type && ! empty( $core_update->support_email );
 		if ( $critical_support ) {
 			// Support offer if available.
 			$body .= "\n\n" . sprintf(
 				/* translators: %s: Support email address. */
 				__( 'The WordPress team is willing to help you. Forward this email to %s and the team will work with you to make sure your site is working.' ),
 				$core_update->support_email
 			);
 		} else {
 			// Add a note about the support forums.
 			$body .= "\n\n" . __( 'If you experience any issues or need support, the volunteers in the WordPress.org support forums may be able to help.' );
 			$body .= "\n" . __( 'https://wordpress.org/support/forums/' );
 		}
 
 		// Updates are important!
 		if ( 'success' !== $type || $newer_version_available ) {
 			$body .= "\n\n" . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' );
 		}
 
 		if ( $critical_support ) {
 			$body .= ' ' . __( "If you reach out to us, we'll also ensure you'll never have this problem again." );
 		}
 
 		// If things are successful and we're now on the latest, mention plugins and themes if any are out of date.
 		if ( 'success' === $type && ! $newer_version_available && ( get_plugin_updates() || get_theme_updates() ) ) {
 			$body .= "\n\n" . __( 'You also have some plugins or themes with updates available. Update them now:' );
 			$body .= "\n" . network_admin_url();
 		}
 
 		$body .= "\n\n" . __( 'The WordPress Team' ) . "\n";
 
 		if ( 'critical' === $type && is_wp_error( $result ) ) {
 			$body .= "\n***\n\n";
 			/* translators: %s: WordPress version. */
 			$body .= sprintf( __( 'Your site was running version %s.' ), get_bloginfo( 'version' ) );
 			$body .= ' ' . __( 'We have some data that describes the error your site encountered.' );
 			$body .= ' ' . __( 'Your hosting company, support forum volunteers, or a friendly developer may be able to use this information to help you:' );
 
 			// If we had a rollback and we're still critical, then the rollback failed too.
 			// Loop through all errors (the main WP_Error, the update result, the rollback result) for code, data, etc.
 			if ( 'rollback_was_required' === $result->get_error_code() ) {
 				$errors = array( $result, $result->get_error_data()->update, $result->get_error_data()->rollback );
 			} else {
 				$errors = array( $result );
 			}
 
 			foreach ( $errors as $error ) {
 				if ( ! is_wp_error( $error ) ) {
 					continue;
 				}
 
 				$error_code = $error->get_error_code();
 				/* translators: %s: Error code. */
 				$body .= "\n\n" . sprintf( __( 'Error code: %s' ), $error_code );
 
 				if ( 'rollback_was_required' === $error_code ) {
 					continue;
 				}
 
 				if ( $error->get_error_message() ) {
 					$body .= "\n" . $error->get_error_message();
 				}
 
 				$error_data = $error->get_error_data();
 				if ( $error_data ) {
 					$body .= "\n" . implode( ', ', (array) $error_data );
 				}
 			}
 
 			$body .= "\n";
 		}
 
 		$to      = get_site_option( 'admin_email' );
 		$headers = '';
 
 		$email = compact( 'to', 'subject', 'body', 'headers' );
 
 		/**
 		 * Filters the email sent following an automatic background core update.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param array $email {
 		 *     Array of email arguments that will be passed to wp_mail().
 		 *
 		 *     @type string $to      The email recipient. An array of emails
 		 *                            can be returned, as handled by wp_mail().
 		 *     @type string $subject The email's subject.
 		 *     @type string $body    The email message body.
 		 *     @type string $headers Any email headers, defaults to no headers.
 		 * }
 		 * @param string $type        The type of email being sent. Can be one of
 		 *                            'success', 'fail', 'manual', 'critical'.
 		 * @param object $core_update The update offer that was attempted.
 		 * @param mixed  $result      The result for the core update. Can be WP_Error.
 		 */
 		$email = apply_filters( 'auto_core_update_email', $email, $type, $core_update, $result );
 
 		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
 	}
 
 
 	/**
 	 * If we tried to perform plugin or theme updates, check if we should send an email.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @param array $update_results The results of update tasks.
 	 */
 	protected function after_plugin_theme_update( $update_results ) {
 		$successful_updates = array();
 		$failed_updates     = array();
 
 		if ( ! empty( $update_results['plugin'] ) ) {
 			/**
 			 * Filters whether to send an email following an automatic background plugin update.
 			 *
 			 * @since 5.5.0
 			 * @since 5.5.1 Added the `$update_results` parameter.
 			 *
 			 * @param bool  $enabled        True if plugin update notifications are enabled, false otherwise.
 			 * @param array $update_results The results of plugins update tasks.
 			 */
 			$notifications_enabled = apply_filters( 'auto_plugin_update_send_email', true, $update_results['plugin'] );
 
 			if ( $notifications_enabled ) {
 				foreach ( $update_results['plugin'] as $update_result ) {
 					if ( true === $update_result->result ) {
 						$successful_updates['plugin'][] = $update_result;
 					} else {
 						$failed_updates['plugin'][] = $update_result;
 					}
 				}
 			}
 		}
 
 		if ( ! empty( $update_results['theme'] ) ) {
 			/**
 			 * Filters whether to send an email following an automatic background theme update.
 			 *
 			 * @since 5.5.0
 			 * @since 5.5.1 Added the `$update_results` parameter.
 			 *
 			 * @param bool  $enabled        True if theme update notifications are enabled, false otherwise.
 			 * @param array $update_results The results of theme update tasks.
 			 */
 			$notifications_enabled = apply_filters( 'auto_theme_update_send_email', true, $update_results['theme'] );
 
 			if ( $notifications_enabled ) {
 				foreach ( $update_results['theme'] as $update_result ) {
 					if ( true === $update_result->result ) {
 						$successful_updates['theme'][] = $update_result;
 					} else {
 						$failed_updates['theme'][] = $update_result;
 					}
 				}
 			}
 		}
 
 		if ( empty( $successful_updates ) && empty( $failed_updates ) ) {
 			return;
 		}
 
 		if ( empty( $failed_updates ) ) {
 			$this->send_plugin_theme_email( 'success', $successful_updates, $failed_updates );
 		} elseif ( empty( $successful_updates ) ) {
 			$this->send_plugin_theme_email( 'fail', $successful_updates, $failed_updates );
 		} else {
 			$this->send_plugin_theme_email( 'mixed', $successful_updates, $failed_updates );
 		}
 	}
 
 	/**
 	 * Sends an email upon the completion or failure of a plugin or theme background update.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @param string $type               The type of email to send. Can be one of 'success', 'fail', 'mixed'.
 	 * @param array  $successful_updates A list of updates that succeeded.
 	 * @param array  $failed_updates     A list of updates that failed.
 	 */
 	protected function send_plugin_theme_email( $type, $successful_updates, $failed_updates ) {
 		// No updates were attempted.
 		if ( empty( $successful_updates ) && empty( $failed_updates ) ) {
 			return;
 		}
 
 		$unique_failures     = false;
 		$past_failure_emails = get_option( 'auto_plugin_theme_update_emails', array() );
 
 		/*
 		 * When only failures have occurred, an email should only be sent if there are unique failures.
 		 * A failure is considered unique if an email has not been sent for an update attempt failure
 		 * to a plugin or theme with the same new_version.
 		 */
 		if ( 'fail' === $type ) {
 			foreach ( $failed_updates as $update_type => $failures ) {
 				foreach ( $failures as $failed_update ) {
 					if ( ! isset( $past_failure_emails[ $failed_update->item->{$update_type} ] ) ) {
 						$unique_failures = true;
 						continue;
 					}
 
 					// Check that the failure represents a new failure based on the new_version.
 					if ( version_compare( $past_failure_emails[ $failed_update->item->{$update_type} ], $failed_update->item->new_version, '<' ) ) {
 						$unique_failures = true;
 					}
 				}
 			}
 
 			if ( ! $unique_failures ) {
 				return;
 			}
 		}
 
 		$body               = array();
 		$successful_plugins = ( ! empty( $successful_updates['plugin'] ) );
 		$successful_themes  = ( ! empty( $successful_updates['theme'] ) );
 		$failed_plugins     = ( ! empty( $failed_updates['plugin'] ) );
 		$failed_themes      = ( ! empty( $failed_updates['theme'] ) );
 
 		switch ( $type ) {
 			case 'success':
 				if ( $successful_plugins && $successful_themes ) {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some plugins and themes have automatically updated' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Some plugins and themes have automatically updated to their latest versions on your site at %s. No further action is needed on your part.' ),
 						home_url()
 					);
 				} elseif ( $successful_plugins ) {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some plugins were automatically updated' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Some plugins have automatically updated to their latest versions on your site at %s. No further action is needed on your part.' ),
 						home_url()
 					);
 				} else {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some themes were automatically updated' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Some themes have automatically updated to their latest versions on your site at %s. No further action is needed on your part.' ),
 						home_url()
 					);
 				}
 
 				break;
 			case 'fail':
 			case 'mixed':
 				if ( $failed_plugins && $failed_themes ) {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some plugins and themes have failed to update' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Plugins and themes failed to update on your site at %s.' ),
 						home_url()
 					);
 				} elseif ( $failed_plugins ) {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some plugins have failed to update' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Plugins failed to update on your site at %s.' ),
 						home_url()
 					);
 				} else {
 					/* translators: %s: Site title. */
 					$subject = __( '[%s] Some themes have failed to update' );
 					$body[]  = sprintf(
 						/* translators: %s: Home URL. */
 						__( 'Howdy! Themes failed to update on your site at %s.' ),
 						home_url()
 					);
 				}
 
 				break;
 		}
 
 		if ( in_array( $type, array( 'fail', 'mixed' ), true ) ) {
 			$body[] = "\n";
 			$body[] = __( 'Please check your site now. It’s possible that everything is working. If there are updates available, you should update.' );
 			$body[] = "\n";
 
 			// List failed plugin updates.
 			if ( ! empty( $failed_updates['plugin'] ) ) {
 				$body[] = __( 'These plugins failed to update:' );
 
 				foreach ( $failed_updates['plugin'] as $item ) {
 					if ( $item->item->current_version ) {
 						$body[] = sprintf(
 							/* translators: 1: Plugin name, 2: Current version number, 3: New version number. */
 							__( '- %1$s (from version %2$s to %3$s)' ),
 							$item->name,
 							$item->item->current_version,
 							$item->item->new_version
 						);
 					} else {
 						$body[] = sprintf(
 							/* translators: 1: Plugin name, 2: Version number. */
 							__( '- %1$s version %2$s' ),
 							$item->name,
 							$item->item->new_version
 						);
 					}
 
 					$past_failure_emails[ $item->item->plugin ] = $item->item->new_version;
 				}
 
 				$body[] = "\n";
 			}
 
 			// List failed theme updates.
 			if ( ! empty( $failed_updates['theme'] ) ) {
 				$body[] = __( 'These themes failed to update:' );
 
 				foreach ( $failed_updates['theme'] as $item ) {
 					if ( $item->item->current_version ) {
 						$body[] = sprintf(
 							/* translators: 1: Theme name, 2: Current version number, 3: New version number. */
 							__( '- %1$s (from version %2$s to %3$s)' ),
 							$item->name,
 							$item->item->current_version,
 							$item->item->new_version
 						);
 					} else {
 						$body[] = sprintf(
 							/* translators: 1: Theme name, 2: Version number. */
 							__( '- %1$s version %2$s' ),
 							$item->name,
 							$item->item->new_version
 						);
 					}
 
 					$past_failure_emails[ $item->item->theme ] = $item->item->new_version;
 				}
 
 				$body[] = "\n";
 			}
 		}
 
 		// List successful updates.
 		if ( in_array( $type, array( 'success', 'mixed' ), true ) ) {
 			$body[] = "\n";
 
 			// List successful plugin updates.
 			if ( ! empty( $successful_updates['plugin'] ) ) {
 				$body[] = __( 'These plugins are now up to date:' );
 
 				foreach ( $successful_updates['plugin'] as $item ) {
 					if ( $item->item->current_version ) {
 						$body[] = sprintf(
 							/* translators: 1: Plugin name, 2: Current version number, 3: New version number. */
 							__( '- %1$s (from version %2$s to %3$s)' ),
 							$item->name,
 							$item->item->current_version,
 							$item->item->new_version
 						);
 					} else {
 						$body[] = sprintf(
 							/* translators: 1: Plugin name, 2: Version number. */
 							__( '- %1$s version %2$s' ),
 							$item->name,
 							$item->item->new_version
 						);
 					}
 
 					unset( $past_failure_emails[ $item->item->plugin ] );
 				}
 
 				$body[] = "\n";
 			}
 
 			// List successful theme updates.
 			if ( ! empty( $successful_updates['theme'] ) ) {
 				$body[] = __( 'These themes are now up to date:' );
 
 				foreach ( $successful_updates['theme'] as $item ) {
 					if ( $item->item->current_version ) {
 						$body[] = sprintf(
 							/* translators: 1: Theme name, 2: Current version number, 3: New version number. */
 							__( '- %1$s (from version %2$s to %3$s)' ),
 							$item->name,
 							$item->item->current_version,
 							$item->item->new_version
 						);
 					} else {
 						$body[] = sprintf(
 							/* translators: 1: Theme name, 2: Version number. */
 							__( '- %1$s version %2$s' ),
 							$item->name,
 							$item->item->new_version
 						);
 					}
 
 					unset( $past_failure_emails[ $item->item->theme ] );
 				}
 
 				$body[] = "\n";
 			}
 		}
 
 		if ( $failed_plugins ) {
 			$body[] = sprintf(
 				/* translators: %s: Plugins screen URL. */
 				__( 'To manage plugins on your site, visit the Plugins page: %s' ),
 				admin_url( 'plugins.php' )
 			);
 			$body[] = "\n";
 		}
 
 		if ( $failed_themes ) {
 			$body[] = sprintf(
 				/* translators: %s: Themes screen URL. */
 				__( 'To manage themes on your site, visit the Themes page: %s' ),
 				admin_url( 'themes.php' )
 			);
 			$body[] = "\n";
 		}
 
 		// Add a note about the support forums.
 		$body[] = __( 'If you experience any issues or need support, the volunteers in the WordPress.org support forums may be able to help.' );
 		$body[] = __( 'https://wordpress.org/support/forums/' );
 		$body[] = "\n" . __( 'The WordPress Team' );
 
 		$body    = implode( "\n", $body );
 		$to      = get_site_option( 'admin_email' );
 		$subject = sprintf( $subject, wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ) );
 		$headers = '';
 
 		$email = compact( 'to', 'subject', 'body', 'headers' );
 
 		/**
 		 * Filters the email sent following an automatic background update for plugins and themes.
 		 *
 		 * @since 5.5.0
 		 *
 		 * @param array  $email {
 		 *     Array of email arguments that will be passed to wp_mail().
 		 *
 		 *     @type string $to      The email recipient. An array of emails
 		 *                           can be returned, as handled by wp_mail().
 		 *     @type string $subject The email's subject.
 		 *     @type string $body    The email message body.
 		 *     @type string $headers Any email headers, defaults to no headers.
 		 * }
 		 * @param string $type               The type of email being sent. Can be one of 'success', 'fail', 'mixed'.
 		 * @param array  $successful_updates A list of updates that succeeded.
 		 * @param array  $failed_updates     A list of updates that failed.
 		 */
 		$email = apply_filters( 'auto_plugin_theme_update_email', $email, $type, $successful_updates, $failed_updates );
 
 		$result = wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
 
 		if ( $result ) {
 			update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );
 		}
 	}
 
 	/**
 	 * Prepares and sends an email of a full log of background update results, useful for debugging and geekery.
 	 *
 	 * @since 3.7.0
 	 */
 	protected function send_debug_email() {
 		$update_count = 0;
 		foreach ( $this->update_results as $type => $updates ) {
 			$update_count += count( $updates );
 		}
 
 		$body     = array();
 		$failures = 0;
 
 		/* translators: %s: Network home URL. */
 		$body[] = sprintf( __( 'WordPress site: %s' ), network_home_url( '/' ) );
 
 		// Core.
 		if ( isset( $this->update_results['core'] ) ) {
 			$result = $this->update_results['core'][0];
 
 			if ( $result->result && ! is_wp_error( $result->result ) ) {
 				/* translators: %s: WordPress version. */
 				$body[] = sprintf( __( 'SUCCESS: WordPress was successfully updated to %s' ), $result->name );
 			} else {
 				/* translators: %s: WordPress version. */
 				$body[] = sprintf( __( 'FAILED: WordPress failed to update to %s' ), $result->name );
 				$failures++;
 			}
 
 			$body[] = '';
 		}
 
 		// Plugins, Themes, Translations.
 		foreach ( array( 'plugin', 'theme', 'translation' ) as $type ) {
 			if ( ! isset( $this->update_results[ $type ] ) ) {
 				continue;
 			}
 
 			$success_items = wp_list_filter( $this->update_results[ $type ], array( 'result' => true ) );
 
 			if ( $success_items ) {
 				$messages = array(
 					'plugin'      => __( 'The following plugins were successfully updated:' ),
 					'theme'       => __( 'The following themes were successfully updated:' ),
 					'translation' => __( 'The following translations were successfully updated:' ),
 				);
 
 				$body[] = $messages[ $type ];
 				foreach ( wp_list_pluck( $success_items, 'name' ) as $name ) {
 					/* translators: %s: Name of plugin / theme / translation. */
 					$body[] = ' * ' . sprintf( __( 'SUCCESS: %s' ), $name );
 				}
 			}
 
 			if ( $success_items !== $this->update_results[ $type ] ) {
 				// Failed updates.
 				$messages = array(
 					'plugin'      => __( 'The following plugins failed to update:' ),
 					'theme'       => __( 'The following themes failed to update:' ),
 					'translation' => __( 'The following translations failed to update:' ),
 				);
 
 				$body[] = $messages[ $type ];
 
 				foreach ( $this->update_results[ $type ] as $item ) {
 					if ( ! $item->result || is_wp_error( $item->result ) ) {
 						/* translators: %s: Name of plugin / theme / translation. */
 						$body[] = ' * ' . sprintf( __( 'FAILED: %s' ), $item->name );
 						$failures++;
 					}
 				}
 			}
 
 			$body[] = '';
 		}
 
 		$site_title = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
 
 		if ( $failures ) {
 			$body[] = trim(
 				__(
 					"BETA TESTING?
 =============
 
 This debugging email is sent when you are using a development version of WordPress.
 
 If you think these failures might be due to a bug in WordPress, could you report it?
  * Open a thread in the support forums: https://wordpress.org/support/forum/alphabeta
  * Or, if you're comfortable writing a bug report: https://core.trac.wordpress.org/
 
 Thanks! -- The WordPress Team"
 				)
 			);
 			$body[] = '';
 
 			/* translators: Background update failed notification email subject. %s: Site title. */
 			$subject = sprintf( __( '[%s] Background Update Failed' ), $site_title );
 		} else {
 			/* translators: Background update finished notification email subject. %s: Site title. */
 			$subject = sprintf( __( '[%s] Background Update Finished' ), $site_title );
 		}
 
 		$body[] = trim(
 			__(
 				'UPDATE LOG
 =========='
 			)
 		);
 		$body[] = '';
 
 		foreach ( array( 'core', 'plugin', 'theme', 'translation' ) as $type ) {
 			if ( ! isset( $this->update_results[ $type ] ) ) {
 				continue;
 			}
 
 			foreach ( $this->update_results[ $type ] as $update ) {
 				$body[] = $update->name;
 				$body[] = str_repeat( '-', strlen( $update->name ) );
 
 				foreach ( $update->messages as $message ) {
 					$body[] = '  ' . html_entity_decode( str_replace( '&#8230;', '...', $message ) );
 				}
 
 				if ( is_wp_error( $update->result ) ) {
 					$results = array( 'update' => $update->result );
 
 					// If we rolled back, we want to know an error that occurred then too.
 					if ( 'rollback_was_required' === $update->result->get_error_code() ) {
 						$results = (array) $update->result->get_error_data();
 					}
 
 					foreach ( $results as $result_type => $result ) {
 						if ( ! is_wp_error( $result ) ) {
 							continue;
 						}
 
 						if ( 'rollback' === $result_type ) {
 							/* translators: 1: Error code, 2: Error message. */
 							$body[] = '  ' . sprintf( __( 'Rollback Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
 						} else {
 							/* translators: 1: Error code, 2: Error message. */
 							$body[] = '  ' . sprintf( __( 'Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
 						}
 
 						if ( $result->get_error_data() ) {
 							$body[] = '         ' . implode( ', ', (array) $result->get_error_data() );
 						}
 					}
 				}
 
 				$body[] = '';
 			}
 		}
 
 		$email = array(
 			'to'      => get_site_option( 'admin_email' ),
 			'subject' => $subject,
 			'body'    => implode( "\n", $body ),
 			'headers' => '',
 		);
 
 		/**
 		 * Filters the debug email that can be sent following an automatic
 		 * background core update.
 		 *
 		 * @since 3.8.0
 		 *
 		 * @param array $email {
 		 *     Array of email arguments that will be passed to wp_mail().
 		 *
 		 *     @type string $to      The email recipient. An array of emails
 		 *                           can be returned, as handled by wp_mail().
 		 *     @type string $subject Email subject.
 		 *     @type string $body    Email message body.
 		 *     @type string $headers Any email headers. Default empty.
 		 * }
 		 * @param int   $failures The number of failures encountered while upgrading.
 		 * @param mixed $results  The results of all attempted updates.
 		 */
 		$email = apply_filters( 'automatic_updates_debug_email', $email, $failures, $this->update_results );
 
 		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
 	}
 }