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/wp-admin/includes/ -> class-wp-automatic-updater.php (source)

   1  <?php
   2  /**
   3   * Upgrade API: WP_Automatic_Updater class
   4   *
   5   * @package WordPress
   6   * @subpackage Upgrader
   7   * @since 4.6.0
   8   */
   9  
  10  /**
  11   * Core class used for handling automatic background updates.
  12   *
  13   * @since 3.7.0
  14   * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
  15   */
  16  class WP_Automatic_Updater {
  17  
  18      /**
  19       * Tracks update results during processing.
  20       *
  21       * @var array
  22       */
  23      protected $update_results = array();
  24  
  25      /**
  26       * Whether the entire automatic updater is disabled.
  27       *
  28       * @since 3.7.0
  29       */
  30  	public function is_disabled() {
  31          // Background updates are disabled if you don't want file changes.
  32          if ( ! wp_is_file_mod_allowed( 'automatic_updater' ) ) {
  33              return true;
  34          }
  35  
  36          if ( wp_installing() ) {
  37              return true;
  38          }
  39  
  40          // More fine grained control can be done through the WP_AUTO_UPDATE_CORE constant and filters.
  41          $disabled = defined( 'AUTOMATIC_UPDATER_DISABLED' ) && AUTOMATIC_UPDATER_DISABLED;
  42  
  43          /**
  44           * Filters whether to entirely disable background updates.
  45           *
  46           * There are more fine-grained filters and controls for selective disabling.
  47           * This filter parallels the AUTOMATIC_UPDATER_DISABLED constant in name.
  48           *
  49           * This also disables update notification emails. That may change in the future.
  50           *
  51           * @since 3.7.0
  52           *
  53           * @param bool $disabled Whether the updater should be disabled.
  54           */
  55          return apply_filters( 'automatic_updater_disabled', $disabled );
  56      }
  57  
  58      /**
  59       * Check for version control checkouts.
  60       *
  61       * Checks for Subversion, Git, Mercurial, and Bazaar. It recursively looks up the
  62       * filesystem to the top of the drive, erring on the side of detecting a VCS
  63       * checkout somewhere.
  64       *
  65       * ABSPATH is always checked in addition to whatever `$context` is (which may be the
  66       * wp-content directory, for example). The underlying assumption is that if you are
  67       * using version control *anywhere*, then you should be making decisions for
  68       * how things get updated.
  69       *
  70       * @since 3.7.0
  71       *
  72       * @param string $context The filesystem path to check, in addition to ABSPATH.
  73       * @return bool True if a VCS checkout was discovered at `$context` or ABSPATH,
  74       *              or anywhere higher. False otherwise.
  75       */
  76  	public function is_vcs_checkout( $context ) {
  77          $context_dirs = array( untrailingslashit( $context ) );
  78          if ( ABSPATH !== $context ) {
  79              $context_dirs[] = untrailingslashit( ABSPATH );
  80          }
  81  
  82          $vcs_dirs   = array( '.svn', '.git', '.hg', '.bzr' );
  83          $check_dirs = array();
  84  
  85          foreach ( $context_dirs as $context_dir ) {
  86              // Walk up from $context_dir to the root.
  87              do {
  88                  $check_dirs[] = $context_dir;
  89  
  90                  // Once we've hit '/' or 'C:\', we need to stop. dirname will keep returning the input here.
  91                  if ( dirname( $context_dir ) === $context_dir ) {
  92                      break;
  93                  }
  94  
  95                  // Continue one level at a time.
  96              } while ( $context_dir = dirname( $context_dir ) );
  97          }
  98  
  99          $check_dirs = array_unique( $check_dirs );
 100  
 101          // Search all directories we've found for evidence of version control.
 102          foreach ( $vcs_dirs as $vcs_dir ) {
 103              foreach ( $check_dirs as $check_dir ) {
 104                  $checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" );
 105                  if ( $checkout ) {
 106                      break 2;
 107                  }
 108              }
 109          }
 110  
 111          /**
 112           * Filters whether the automatic updater should consider a filesystem
 113           * location to be potentially managed by a version control system.
 114           *
 115           * @since 3.7.0
 116           *
 117           * @param bool $checkout  Whether a VCS checkout was discovered at `$context`
 118           *                        or ABSPATH, or anywhere higher.
 119           * @param string $context The filesystem context (a path) against which
 120           *                        filesystem status should be checked.
 121           */
 122          return apply_filters( 'automatic_updates_is_vcs_checkout', $checkout, $context );
 123      }
 124  
 125      /**
 126       * Tests to see if we can and should update a specific item.
 127       *
 128       * @since 3.7.0
 129       *
 130       * @global wpdb $wpdb WordPress database abstraction object.
 131       *
 132       * @param string $type    The type of update being checked: 'core', 'theme',
 133       *                        'plugin', 'translation'.
 134       * @param object $item    The update offer.
 135       * @param string $context The filesystem context (a path) against which filesystem
 136       *                        access and status should be checked.
 137       * @return bool True if the item should be updated, false otherwise.
 138       */
 139  	public function should_update( $type, $item, $context ) {
 140          // Used to see if WP_Filesystem is set up to allow unattended updates.
 141          $skin = new Automatic_Upgrader_Skin;
 142  
 143          if ( $this->is_disabled() ) {
 144              return false;
 145          }
 146  
 147          // Only relax the filesystem checks when the update doesn't include new files.
 148          $allow_relaxed_file_ownership = false;
 149          if ( 'core' === $type && isset( $item->new_files ) && ! $item->new_files ) {
 150              $allow_relaxed_file_ownership = true;
 151          }
 152  
 153          // If we can't do an auto core update, we may still be able to email the user.
 154          if ( ! $skin->request_filesystem_credentials( false, $context, $allow_relaxed_file_ownership ) || $this->is_vcs_checkout( $context ) ) {
 155              if ( 'core' === $type ) {
 156                  $this->send_core_update_notification_email( $item );
 157              }
 158              return false;
 159          }
 160  
 161          // Next up, is this an item we can update?
 162          if ( 'core' === $type ) {
 163              $update = Core_Upgrader::should_update_to_version( $item->current );
 164          } elseif ( 'plugin' === $type || 'theme' === $type ) {
 165              $update = ! empty( $item->autoupdate );
 166  
 167              if ( ! $update && wp_is_auto_update_enabled_for_type( $type ) ) {
 168                  // Check if the site admin has enabled auto-updates by default for the specific item.
 169                  $auto_updates = (array) get_site_option( "auto_update_{$type}s", array() );
 170                  $update       = in_array( $item->{$type}, $auto_updates, true );
 171              }
 172          } else {
 173              $update = ! empty( $item->autoupdate );
 174          }
 175  
 176          // If the `disable_autoupdate` flag is set, override any user-choice, but allow filters.
 177          if ( ! empty( $item->disable_autoupdate ) ) {
 178              $update = $item->disable_autoupdate;
 179          }
 180  
 181          /**
 182           * Filters whether to automatically update core, a plugin, a theme, or a language.
 183           *
 184           * The dynamic portion of the hook name, `$type`, refers to the type of update
 185           * being checked. Potential hook names include:
 186           *
 187           *  - `auto_update_core`
 188           *  - `auto_update_plugin`
 189           *  - `auto_update_theme`
 190           *  - `auto_update_translation`
 191           *
 192           * Generally speaking, plugins, themes, and major core versions are not updated
 193           * by default, while translations and minor and development versions for core
 194           * are updated by default.
 195           *
 196           * See the {@see 'allow_dev_auto_core_updates'}, {@see 'allow_minor_auto_core_updates'},
 197           * and {@see 'allow_major_auto_core_updates'} filters for a more straightforward way to
 198           * adjust core updates.
 199           *
 200           * @since 3.7.0
 201           * @since 5.5.0 The `$update` parameter accepts the value of null.
 202           *
 203           * @param bool|null $update Whether to update. The value of null is internally used
 204           *                          to detect whether nothing has hooked into this filter.
 205           * @param object    $item   The update offer.
 206           */
 207          $update = apply_filters( "auto_update_{$type}", $update, $item );
 208  
 209          if ( ! $update ) {
 210              if ( 'core' === $type ) {
 211                  $this->send_core_update_notification_email( $item );
 212              }
 213              return false;
 214          }
 215  
 216          // If it's a core update, are we actually compatible with its requirements?
 217          if ( 'core' === $type ) {
 218              global $wpdb;
 219  
 220              $php_compat = version_compare( phpversion(), $item->php_version, '>=' );
 221              if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {
 222                  $mysql_compat = true;
 223              } else {
 224                  $mysql_compat = version_compare( $wpdb->db_version(), $item->mysql_version, '>=' );
 225              }
 226  
 227              if ( ! $php_compat || ! $mysql_compat ) {
 228                  return false;
 229              }
 230          }
 231  
 232          // If updating a plugin or theme, ensure the minimum PHP version requirements are satisfied.
 233          if ( in_array( $type, array( 'plugin', 'theme' ), true ) ) {
 234              if ( ! empty( $item->requires_php ) && version_compare( phpversion(), $item->requires_php, '<' ) ) {
 235                  return false;
 236              }
 237          }
 238  
 239          return true;
 240      }
 241  
 242      /**
 243       * Notifies an administrator of a core update.
 244       *
 245       * @since 3.7.0
 246       *
 247       * @param object $item The update offer.
 248       * @return bool True if the site administrator is notified of a core update,
 249       *              false otherwise.
 250       */
 251  	protected function send_core_update_notification_email( $item ) {
 252          $notified = get_site_option( 'auto_core_update_notified' );
 253  
 254          // Don't notify if we've already notified the same email address of the same version.
 255          if ( $notified && get_site_option( 'admin_email' ) === $notified['email'] && $notified['version'] == $item->current ) {
 256              return false;
 257          }
 258  
 259          // See if we need to notify users of a core update.
 260          $notify = ! empty( $item->notify_email );
 261  
 262          /**
 263           * Filters whether to notify the site administrator of a new core update.
 264           *
 265           * By default, administrators are notified when the update offer received
 266           * from WordPress.org sets a particular flag. This allows some discretion
 267           * in if and when to notify.
 268           *
 269           * This filter is only evaluated once per release. If the same email address
 270           * was already notified of the same new version, WordPress won't repeatedly
 271           * email the administrator.
 272           *
 273           * This filter is also used on about.php to check if a plugin has disabled
 274           * these notifications.
 275           *
 276           * @since 3.7.0
 277           *
 278           * @param bool   $notify Whether the site administrator is notified.
 279           * @param object $item   The update offer.
 280           */
 281          if ( ! apply_filters( 'send_core_update_notification_email', $notify, $item ) ) {
 282              return false;
 283          }
 284  
 285          $this->send_email( 'manual', $item );
 286          return true;
 287      }
 288  
 289      /**
 290       * Update an item, if appropriate.
 291       *
 292       * @since 3.7.0
 293       *
 294       * @param string $type The type of update being checked: 'core', 'theme', 'plugin', 'translation'.
 295       * @param object $item The update offer.
 296       * @return null|WP_Error
 297       */
 298  	public function update( $type, $item ) {
 299          $skin = new Automatic_Upgrader_Skin;
 300  
 301          switch ( $type ) {
 302              case 'core':
 303                  // The Core upgrader doesn't use the Upgrader's skin during the actual main part of the upgrade, instead, firing a filter.
 304                  add_filter( 'update_feedback', array( $skin, 'feedback' ) );
 305                  $upgrader = new Core_Upgrader( $skin );
 306                  $context  = ABSPATH;
 307                  break;
 308              case 'plugin':
 309                  $upgrader = new Plugin_Upgrader( $skin );
 310                  $context  = WP_PLUGIN_DIR; // We don't support custom Plugin directories, or updates for WPMU_PLUGIN_DIR.
 311                  break;
 312              case 'theme':
 313                  $upgrader = new Theme_Upgrader( $skin );
 314                  $context  = get_theme_root( $item->theme );
 315                  break;
 316              case 'translation':
 317                  $upgrader = new Language_Pack_Upgrader( $skin );
 318                  $context  = WP_CONTENT_DIR; // WP_LANG_DIR;
 319                  break;
 320          }
 321  
 322          // Determine whether we can and should perform this update.
 323          if ( ! $this->should_update( $type, $item, $context ) ) {
 324              return false;
 325          }
 326  
 327          /**
 328           * Fires immediately prior to an auto-update.
 329           *
 330           * @since 4.4.0
 331           *
 332           * @param string $type    The type of update being checked: 'core', 'theme', 'plugin', or 'translation'.
 333           * @param object $item    The update offer.
 334           * @param string $context The filesystem context (a path) against which filesystem access and status
 335           *                        should be checked.
 336           */
 337          do_action( 'pre_auto_update', $type, $item, $context );
 338  
 339          $upgrader_item = $item;
 340          switch ( $type ) {
 341              case 'core':
 342                  /* translators: %s: WordPress version. */
 343                  $skin->feedback( __( 'Updating to WordPress %s' ), $item->version );
 344                  /* translators: %s: WordPress version. */
 345                  $item_name = sprintf( __( 'WordPress %s' ), $item->version );
 346                  break;
 347              case 'theme':
 348                  $upgrader_item = $item->theme;
 349                  $theme         = wp_get_theme( $upgrader_item );
 350                  $item_name     = $theme->Get( 'Name' );
 351                  // Add the current version so that it can be reported in the notification email.
 352                  $item->current_version = $theme->get( 'Version' );
 353                  if ( empty( $item->current_version ) ) {
 354                      $item->current_version = false;
 355                  }
 356                  /* translators: %s: Theme name. */
 357                  $skin->feedback( __( 'Updating theme: %s' ), $item_name );
 358                  break;
 359              case 'plugin':
 360                  $upgrader_item = $item->plugin;
 361                  $plugin_data   = get_plugin_data( $context . '/' . $upgrader_item );
 362                  $item_name     = $plugin_data['Name'];
 363                  // Add the current version so that it can be reported in the notification email.
 364                  $item->current_version = $plugin_data['Version'];
 365                  if ( empty( $item->current_version ) ) {
 366                      $item->current_version = false;
 367                  }
 368                  /* translators: %s: Plugin name. */
 369                  $skin->feedback( __( 'Updating plugin: %s' ), $item_name );
 370                  break;
 371              case 'translation':
 372                  $language_item_name = $upgrader->get_name_for_update( $item );
 373                  /* translators: %s: Project name (plugin, theme, or WordPress). */
 374                  $item_name = sprintf( __( 'Translations for %s' ), $language_item_name );
 375                  /* translators: 1: Project name (plugin, theme, or WordPress), 2: Language. */
 376                  $skin->feedback( sprintf( __( 'Updating translations for %1$s (%2$s)&#8230;' ), $language_item_name, $item->language ) );
 377                  break;
 378          }
 379  
 380          $allow_relaxed_file_ownership = false;
 381          if ( 'core' === $type && isset( $item->new_files ) && ! $item->new_files ) {
 382              $allow_relaxed_file_ownership = true;
 383          }
 384  
 385          // Boom, this site's about to get a whole new splash of paint!
 386          $upgrade_result = $upgrader->upgrade(
 387              $upgrader_item,
 388              array(
 389                  'clear_update_cache'           => false,
 390                  // Always use partial builds if possible for core updates.
 391                  'pre_check_md5'                => false,
 392                  // Only available for core updates.
 393                  'attempt_rollback'             => true,
 394                  // Allow relaxed file ownership in some scenarios.
 395                  'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership,
 396              )
 397          );
 398  
 399          // If the filesystem is unavailable, false is returned.
 400          if ( false === $upgrade_result ) {
 401              $upgrade_result = new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
 402          }
 403  
 404          if ( 'core' === $type ) {
 405              if ( is_wp_error( $upgrade_result )
 406                  && ( 'up_to_date' === $upgrade_result->get_error_code()
 407                      || 'locked' === $upgrade_result->get_error_code() )
 408              ) {
 409                  // These aren't actual errors, treat it as a skipped-update instead
 410                  // to avoid triggering the post-core update failure routines.
 411                  return false;
 412              }
 413  
 414              // Core doesn't output this, so let's append it so we don't get confused.
 415              if ( is_wp_error( $upgrade_result ) ) {
 416                  $skin->error( __( 'Installation failed.' ), $upgrade_result );
 417              } else {
 418                  $skin->feedback( __( 'WordPress updated successfully.' ) );
 419              }
 420          }
 421  
 422          $this->update_results[ $type ][] = (object) array(
 423              'item'     => $item,
 424              'result'   => $upgrade_result,
 425              'name'     => $item_name,
 426              'messages' => $skin->get_upgrade_messages(),
 427          );
 428  
 429          return $upgrade_result;
 430      }
 431  
 432      /**
 433       * Kicks off the background update process, looping through all pending updates.
 434       *
 435       * @since 3.7.0
 436       */
 437  	public function run() {
 438          if ( $this->is_disabled() ) {
 439              return;
 440          }
 441  
 442          if ( ! is_main_network() || ! is_main_site() ) {
 443              return;
 444          }
 445  
 446          if ( ! WP_Upgrader::create_lock( 'auto_updater' ) ) {
 447              return;
 448          }
 449  
 450          // Don't automatically run these things, as we'll handle it ourselves.
 451          remove_action( 'upgrader_process_complete', array( 'Language_Pack_Upgrader', 'async_upgrade' ), 20 );
 452          remove_action( 'upgrader_process_complete', 'wp_version_check' );
 453          remove_action( 'upgrader_process_complete', 'wp_update_plugins' );
 454          remove_action( 'upgrader_process_complete', 'wp_update_themes' );
 455  
 456          // Next, plugins.
 457          wp_update_plugins(); // Check for plugin updates.
 458          $plugin_updates = get_site_transient( 'update_plugins' );
 459          if ( $plugin_updates && ! empty( $plugin_updates->response ) ) {
 460              foreach ( $plugin_updates->response as $plugin ) {
 461                  $this->update( 'plugin', $plugin );
 462              }
 463              // Force refresh of plugin update information.
 464              wp_clean_plugins_cache();
 465          }
 466  
 467          // Next, those themes we all love.
 468          wp_update_themes();  // Check for theme updates.
 469          $theme_updates = get_site_transient( 'update_themes' );
 470          if ( $theme_updates && ! empty( $theme_updates->response ) ) {
 471              foreach ( $theme_updates->response as $theme ) {
 472                  $this->update( 'theme', (object) $theme );
 473              }
 474              // Force refresh of theme update information.
 475              wp_clean_themes_cache();
 476          }
 477  
 478          // Next, process any core update.
 479          wp_version_check(); // Check for core updates.
 480          $core_update = find_core_auto_update();
 481  
 482          if ( $core_update ) {
 483              $this->update( 'core', $core_update );
 484          }
 485  
 486          // Clean up, and check for any pending translations.
 487          // (Core_Upgrader checks for core updates.)
 488          $theme_stats = array();
 489          if ( isset( $this->update_results['theme'] ) ) {
 490              foreach ( $this->update_results['theme'] as $upgrade ) {
 491                  $theme_stats[ $upgrade->item->theme ] = ( true === $upgrade->result );
 492              }
 493          }
 494          wp_update_themes( $theme_stats ); // Check for theme updates.
 495  
 496          $plugin_stats = array();
 497          if ( isset( $this->update_results['plugin'] ) ) {
 498              foreach ( $this->update_results['plugin'] as $upgrade ) {
 499                  $plugin_stats[ $upgrade->item->plugin ] = ( true === $upgrade->result );
 500              }
 501          }
 502          wp_update_plugins( $plugin_stats ); // Check for plugin updates.
 503  
 504          // Finally, process any new translations.
 505          $language_updates = wp_get_translation_updates();
 506          if ( $language_updates ) {
 507              foreach ( $language_updates as $update ) {
 508                  $this->update( 'translation', $update );
 509              }
 510  
 511              // Clear existing caches.
 512              wp_clean_update_cache();
 513  
 514              wp_version_check();  // Check for core updates.
 515              wp_update_themes();  // Check for theme updates.
 516              wp_update_plugins(); // Check for plugin updates.
 517          }
 518  
 519          // Send debugging email to admin for all development installations.
 520          if ( ! empty( $this->update_results ) ) {
 521              $development_version = false !== strpos( get_bloginfo( 'version' ), '-' );
 522  
 523              /**
 524               * Filters whether to send a debugging email for each automatic background update.
 525               *
 526               * @since 3.7.0
 527               *
 528               * @param bool $development_version By default, emails are sent if the
 529               *                                  install is a development version.
 530               *                                  Return false to avoid the email.
 531               */
 532              if ( apply_filters( 'automatic_updates_send_debug_email', $development_version ) ) {
 533                  $this->send_debug_email();
 534              }
 535  
 536              if ( ! empty( $this->update_results['core'] ) ) {
 537                  $this->after_core_update( $this->update_results['core'][0] );
 538              } elseif ( ! empty( $this->update_results['plugin'] ) || ! empty( $this->update_results['theme'] ) ) {
 539                  $this->after_plugin_theme_update( $this->update_results );
 540              }
 541  
 542              /**
 543               * Fires after all automatic updates have run.
 544               *
 545               * @since 3.8.0
 546               *
 547               * @param array $update_results The results of all attempted updates.
 548               */
 549              do_action( 'automatic_updates_complete', $this->update_results );
 550          }
 551  
 552          WP_Upgrader::release_lock( 'auto_updater' );
 553      }
 554  
 555      /**
 556       * If we tried to perform a core update, check if we should send an email,
 557       * and if we need to avoid processing future updates.
 558       *
 559       * @since 3.7.0
 560       *
 561       * @param object $update_result The result of the core update. Includes the update offer and result.
 562       */
 563  	protected function after_core_update( $update_result ) {
 564          $wp_version = get_bloginfo( 'version' );
 565  
 566          $core_update = $update_result->item;
 567          $result      = $update_result->result;
 568  
 569          if ( ! is_wp_error( $result ) ) {
 570              $this->send_email( 'success', $core_update );
 571              return;
 572          }
 573  
 574          $error_code = $result->get_error_code();
 575  
 576          // Any of these WP_Error codes are critical failures, as in they occurred after we started to copy core files.
 577          // We should not try to perform a background update again until there is a successful one-click update performed by the user.
 578          $critical = false;
 579          if ( 'disk_full' === $error_code || false !== strpos( $error_code, '__copy_dir' ) ) {
 580              $critical = true;
 581          } elseif ( 'rollback_was_required' === $error_code && is_wp_error( $result->get_error_data()->rollback ) ) {
 582              // A rollback is only critical if it failed too.
 583              $critical        = true;
 584              $rollback_result = $result->get_error_data()->rollback;
 585          } elseif ( false !== strpos( $error_code, 'do_rollback' ) ) {
 586              $critical = true;
 587          }
 588  
 589          if ( $critical ) {
 590              $critical_data = array(
 591                  'attempted'  => $core_update->current,
 592                  'current'    => $wp_version,
 593                  'error_code' => $error_code,
 594                  'error_data' => $result->get_error_data(),
 595                  'timestamp'  => time(),
 596                  'critical'   => true,
 597              );
 598              if ( isset( $rollback_result ) ) {
 599                  $critical_data['rollback_code'] = $rollback_result->get_error_code();
 600                  $critical_data['rollback_data'] = $rollback_result->get_error_data();
 601              }
 602              update_site_option( 'auto_core_update_failed', $critical_data );
 603              $this->send_email( 'critical', $core_update, $result );
 604              return;
 605          }
 606  
 607          /*
 608           * Any other WP_Error code (like download_failed or files_not_writable) occurs before
 609           * we tried to copy over core files. Thus, the failures are early and graceful.
 610           *
 611           * We should avoid trying to perform a background update again for the same version.
 612           * But we can try again if another version is released.
 613           *
 614           * For certain 'transient' failures, like download_failed, we should allow retries.
 615           * In fact, let's schedule a special update for an hour from now. (It's possible
 616           * the issue could actually be on WordPress.org's side.) If that one fails, then email.
 617           */
 618          $send               = true;
 619          $transient_failures = array( 'incompatible_archive', 'download_failed', 'insane_distro', 'locked' );
 620          if ( in_array( $error_code, $transient_failures, true ) && ! get_site_option( 'auto_core_update_failed' ) ) {
 621              wp_schedule_single_event( time() + HOUR_IN_SECONDS, 'wp_maybe_auto_update' );
 622              $send = false;
 623          }
 624  
 625          $n = get_site_option( 'auto_core_update_notified' );
 626          // Don't notify if we've already notified the same email address of the same version of the same notification type.
 627          if ( $n && 'fail' === $n['type'] && get_site_option( 'admin_email' ) === $n['email'] && $n['version'] == $core_update->current ) {
 628              $send = false;
 629          }
 630  
 631          update_site_option(
 632              'auto_core_update_failed',
 633              array(
 634                  'attempted'  => $core_update->current,
 635                  'current'    => $wp_version,
 636                  'error_code' => $error_code,
 637                  'error_data' => $result->get_error_data(),
 638                  'timestamp'  => time(),
 639                  'retry'      => in_array( $error_code, $transient_failures, true ),
 640              )
 641          );
 642  
 643          if ( $send ) {
 644              $this->send_email( 'fail', $core_update, $result );
 645          }
 646      }
 647  
 648      /**
 649       * Sends an email upon the completion or failure of a background core update.
 650       *
 651       * @since 3.7.0
 652       *
 653       * @param string $type        The type of email to send. Can be one of 'success', 'fail', 'manual', 'critical'.
 654       * @param object $core_update The update offer that was attempted.
 655       * @param mixed  $result      Optional. The result for the core update. Can be WP_Error.
 656       */
 657  	protected function send_email( $type, $core_update, $result = null ) {
 658          update_site_option(
 659              'auto_core_update_notified',
 660              array(
 661                  'type'      => $type,
 662                  'email'     => get_site_option( 'admin_email' ),
 663                  'version'   => $core_update->current,
 664                  'timestamp' => time(),
 665              )
 666          );
 667  
 668          $next_user_core_update = get_preferred_from_update_core();
 669  
 670          // If the update transient is empty, use the update we just performed.
 671          if ( ! $next_user_core_update ) {
 672              $next_user_core_update = $core_update;
 673          }
 674  
 675          $newer_version_available = ( 'upgrade' === $next_user_core_update->response && version_compare( $next_user_core_update->version, $core_update->version, '>' ) );
 676  
 677          /**
 678           * Filters whether to send an email following an automatic background core update.
 679           *
 680           * @since 3.7.0
 681           *
 682           * @param bool   $send        Whether to send the email. Default true.
 683           * @param string $type        The type of email to send. Can be one of
 684           *                            'success', 'fail', 'critical'.
 685           * @param object $core_update The update offer that was attempted.
 686           * @param mixed  $result      The result for the core update. Can be WP_Error.
 687           */
 688          if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) {
 689              return;
 690          }
 691  
 692          switch ( $type ) {
 693              case 'success': // We updated.
 694                  /* translators: Site updated notification email subject. 1: Site title, 2: WordPress version. */
 695                  $subject = __( '[%1$s] Your site has updated to WordPress %2$s' );
 696                  break;
 697  
 698              case 'fail':   // We tried to update but couldn't.
 699              case 'manual': // We can't update (and made no attempt).
 700                  /* translators: Update available notification email subject. 1: Site title, 2: WordPress version. */
 701                  $subject = __( '[%1$s] WordPress %2$s is available. Please update!' );
 702                  break;
 703  
 704              case 'critical': // We tried to update, started to copy files, then things went wrong.
 705                  /* translators: Site down notification email subject. 1: Site title. */
 706                  $subject = __( '[%1$s] URGENT: Your site may be down due to a failed update' );
 707                  break;
 708  
 709              default:
 710                  return;
 711          }
 712  
 713          // If the auto-update is not to the latest version, say that the current version of WP is available instead.
 714          $version = 'success' === $type ? $core_update->current : $next_user_core_update->current;
 715          $subject = sprintf( $subject, wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ), $version );
 716  
 717          $body = '';
 718  
 719          switch ( $type ) {
 720              case 'success':
 721                  $body .= sprintf(
 722                      /* translators: 1: Home URL, 2: WordPress version. */
 723                      __( 'Howdy! Your site at %1$s has been updated automatically to WordPress %2$s.' ),
 724                      home_url(),
 725                      $core_update->current
 726                  );
 727                  $body .= "\n\n";
 728                  if ( ! $newer_version_available ) {
 729                      $body .= __( 'No further action is needed on your part.' ) . ' ';
 730                  }
 731  
 732                  // Can only reference the About screen if their update was successful.
 733                  list( $about_version ) = explode( '-', $core_update->current, 2 );
 734                  /* translators: %s: WordPress version. */
 735                  $body .= sprintf( __( 'For more on version %s, see the About WordPress screen:' ), $about_version );
 736                  $body .= "\n" . admin_url( 'about.php' );
 737  
 738                  if ( $newer_version_available ) {
 739                      /* translators: %s: WordPress latest version. */
 740                      $body .= "\n\n" . sprintf( __( 'WordPress %s is also now available.' ), $next_user_core_update->current ) . ' ';
 741                      $body .= __( 'Updating is easy and only takes a few moments:' );
 742                      $body .= "\n" . network_admin_url( 'update-core.php' );
 743                  }
 744  
 745                  break;
 746  
 747              case 'fail':
 748              case 'manual':
 749                  $body .= sprintf(
 750                      /* translators: 1: Home URL, 2: WordPress version. */
 751                      __( 'Please update your site at %1$s to WordPress %2$s.' ),
 752                      home_url(),
 753                      $next_user_core_update->current
 754                  );
 755  
 756                  $body .= "\n\n";
 757  
 758                  // Don't show this message if there is a newer version available.
 759                  // Potential for confusion, and also not useful for them to know at this point.
 760                  if ( 'fail' === $type && ! $newer_version_available ) {
 761                      $body .= __( 'We tried but were unable to update your site automatically.' ) . ' ';
 762                  }
 763  
 764                  $body .= __( 'Updating is easy and only takes a few moments:' );
 765                  $body .= "\n" . network_admin_url( 'update-core.php' );
 766                  break;
 767  
 768              case 'critical':
 769                  if ( $newer_version_available ) {
 770                      $body .= sprintf(
 771                          /* translators: 1: Home URL, 2: WordPress version. */
 772                          __( 'Your site at %1$s experienced a critical failure while trying to update WordPress to version %2$s.' ),
 773                          home_url(),
 774                          $core_update->current
 775                      );
 776                  } else {
 777                      $body .= sprintf(
 778                          /* translators: 1: Home URL, 2: WordPress latest version. */
 779                          __( 'Your site at %1$s experienced a critical failure while trying to update to the latest version of WordPress, %2$s.' ),
 780                          home_url(),
 781                          $core_update->current
 782                      );
 783                  }
 784  
 785                  $body .= "\n\n" . __( "This means your site may be offline or broken. Don't panic; this can be fixed." );
 786  
 787                  $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:" );
 788                  $body .= "\n" . network_admin_url( 'update-core.php' );
 789                  break;
 790          }
 791  
 792          $critical_support = 'critical' === $type && ! empty( $core_update->support_email );
 793          if ( $critical_support ) {
 794              // Support offer if available.
 795              $body .= "\n\n" . sprintf(
 796                  /* translators: %s: Support email address. */
 797                  __( '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.' ),
 798                  $core_update->support_email
 799              );
 800          } else {
 801              // Add a note about the support forums.
 802              $body .= "\n\n" . __( 'If you experience any issues or need support, the volunteers in the WordPress.org support forums may be able to help.' );
 803              $body .= "\n" . __( 'https://wordpress.org/support/forums/' );
 804          }
 805  
 806          // Updates are important!
 807          if ( 'success' !== $type || $newer_version_available ) {
 808              $body .= "\n\n" . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' );
 809          }
 810  
 811          if ( $critical_support ) {
 812              $body .= ' ' . __( "If you reach out to us, we'll also ensure you'll never have this problem again." );
 813          }
 814  
 815          // If things are successful and we're now on the latest, mention plugins and themes if any are out of date.
 816          if ( 'success' === $type && ! $newer_version_available && ( get_plugin_updates() || get_theme_updates() ) ) {
 817              $body .= "\n\n" . __( 'You also have some plugins or themes with updates available. Update them now:' );
 818              $body .= "\n" . network_admin_url();
 819          }
 820  
 821          $body .= "\n\n" . __( 'The WordPress Team' ) . "\n";
 822  
 823          if ( 'critical' === $type && is_wp_error( $result ) ) {
 824              $body .= "\n***\n\n";
 825              /* translators: %s: WordPress version. */
 826              $body .= sprintf( __( 'Your site was running version %s.' ), get_bloginfo( 'version' ) );
 827              $body .= ' ' . __( 'We have some data that describes the error your site encountered.' );
 828              $body .= ' ' . __( 'Your hosting company, support forum volunteers, or a friendly developer may be able to use this information to help you:' );
 829  
 830              // If we had a rollback and we're still critical, then the rollback failed too.
 831              // Loop through all errors (the main WP_Error, the update result, the rollback result) for code, data, etc.
 832              if ( 'rollback_was_required' === $result->get_error_code() ) {
 833                  $errors = array( $result, $result->get_error_data()->update, $result->get_error_data()->rollback );
 834              } else {
 835                  $errors = array( $result );
 836              }
 837  
 838              foreach ( $errors as $error ) {
 839                  if ( ! is_wp_error( $error ) ) {
 840                      continue;
 841                  }
 842  
 843                  $error_code = $error->get_error_code();
 844                  /* translators: %s: Error code. */
 845                  $body .= "\n\n" . sprintf( __( 'Error code: %s' ), $error_code );
 846  
 847                  if ( 'rollback_was_required' === $error_code ) {
 848                      continue;
 849                  }
 850  
 851                  if ( $error->get_error_message() ) {
 852                      $body .= "\n" . $error->get_error_message();
 853                  }
 854  
 855                  $error_data = $error->get_error_data();
 856                  if ( $error_data ) {
 857                      $body .= "\n" . implode( ', ', (array) $error_data );
 858                  }
 859              }
 860  
 861              $body .= "\n";
 862          }
 863  
 864          $to      = get_site_option( 'admin_email' );
 865          $headers = '';
 866  
 867          $email = compact( 'to', 'subject', 'body', 'headers' );
 868  
 869          /**
 870           * Filters the email sent following an automatic background core update.
 871           *
 872           * @since 3.7.0
 873           *
 874           * @param array $email {
 875           *     Array of email arguments that will be passed to wp_mail().
 876           *
 877           *     @type string $to      The email recipient. An array of emails
 878           *                            can be returned, as handled by wp_mail().
 879           *     @type string $subject The email's subject.
 880           *     @type string $body    The email message body.
 881           *     @type string $headers Any email headers, defaults to no headers.
 882           * }
 883           * @param string $type        The type of email being sent. Can be one of
 884           *                            'success', 'fail', 'manual', 'critical'.
 885           * @param object $core_update The update offer that was attempted.
 886           * @param mixed  $result      The result for the core update. Can be WP_Error.
 887           */
 888          $email = apply_filters( 'auto_core_update_email', $email, $type, $core_update, $result );
 889  
 890          wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
 891      }
 892  
 893  
 894      /**
 895       * If we tried to perform plugin or theme updates, check if we should send an email.
 896       *
 897       * @since 5.5.0
 898       *
 899       * @param array $update_results The results of update tasks.
 900       */
 901  	protected function after_plugin_theme_update( $update_results ) {
 902          $successful_updates = array();
 903          $failed_updates     = array();
 904  
 905          if ( ! empty( $update_results['plugin'] ) ) {
 906              /**
 907               * Filters whether to send an email following an automatic background plugin update.
 908               *
 909               * @since 5.5.0
 910               * @since 5.5.1 Added the `$update_results` parameter.
 911               *
 912               * @param bool  $enabled        True if plugin update notifications are enabled, false otherwise.
 913               * @param array $update_results The results of plugins update tasks.
 914               */
 915              $notifications_enabled = apply_filters( 'auto_plugin_update_send_email', true, $update_results['plugin'] );
 916  
 917              if ( $notifications_enabled ) {
 918                  foreach ( $update_results['plugin'] as $update_result ) {
 919                      if ( true === $update_result->result ) {
 920                          $successful_updates['plugin'][] = $update_result;
 921                      } else {
 922                          $failed_updates['plugin'][] = $update_result;
 923                      }
 924                  }
 925              }
 926          }
 927  
 928          if ( ! empty( $update_results['theme'] ) ) {
 929              /**
 930               * Filters whether to send an email following an automatic background theme update.
 931               *
 932               * @since 5.5.0
 933               * @since 5.5.1 Added the `$update_results` parameter.
 934               *
 935               * @param bool  $enabled        True if theme update notifications are enabled, false otherwise.
 936               * @param array $update_results The results of theme update tasks.
 937               */
 938              $notifications_enabled = apply_filters( 'auto_theme_update_send_email', true, $update_results['theme'] );
 939  
 940              if ( $notifications_enabled ) {
 941                  foreach ( $update_results['theme'] as $update_result ) {
 942                      if ( true === $update_result->result ) {
 943                          $successful_updates['theme'][] = $update_result;
 944                      } else {
 945                          $failed_updates['theme'][] = $update_result;
 946                      }
 947                  }
 948              }
 949          }
 950  
 951          if ( empty( $successful_updates ) && empty( $failed_updates ) ) {
 952              return;
 953          }
 954  
 955          if ( empty( $failed_updates ) ) {
 956              $this->send_plugin_theme_email( 'success', $successful_updates, $failed_updates );
 957          } elseif ( empty( $successful_updates ) ) {
 958              $this->send_plugin_theme_email( 'fail', $successful_updates, $failed_updates );
 959          } else {
 960              $this->send_plugin_theme_email( 'mixed', $successful_updates, $failed_updates );
 961          }
 962      }
 963  
 964      /**
 965       * Sends an email upon the completion or failure of a plugin or theme background update.
 966       *
 967       * @since 5.5.0
 968       *
 969       * @param string $type               The type of email to send. Can be one of 'success', 'fail', 'mixed'.
 970       * @param array  $successful_updates A list of updates that succeeded.
 971       * @param array  $failed_updates     A list of updates that failed.
 972       */
 973  	protected function send_plugin_theme_email( $type, $successful_updates, $failed_updates ) {
 974          // No updates were attempted.
 975          if ( empty( $successful_updates ) && empty( $failed_updates ) ) {
 976              return;
 977          }
 978  
 979          $unique_failures     = false;
 980          $past_failure_emails = get_option( 'auto_plugin_theme_update_emails', array() );
 981  
 982          /*
 983           * When only failures have occurred, an email should only be sent if there are unique failures.
 984           * A failure is considered unique if an email has not been sent for an update attempt failure
 985           * to a plugin or theme with the same new_version.
 986           */
 987          if ( 'fail' === $type ) {
 988              foreach ( $failed_updates as $update_type => $failures ) {
 989                  foreach ( $failures as $failed_update ) {
 990                      if ( ! isset( $past_failure_emails[ $failed_update->item->{$update_type} ] ) ) {
 991                          $unique_failures = true;
 992                          continue;
 993                      }
 994  
 995                      // Check that the failure represents a new failure based on the new_version.
 996                      if ( version_compare( $past_failure_emails[ $failed_update->item->{$update_type} ], $failed_update->item->new_version, '<' ) ) {
 997                          $unique_failures = true;
 998                      }
 999                  }
1000              }
1001  
1002              if ( ! $unique_failures ) {
1003                  return;
1004              }
1005          }
1006  
1007          $body               = array();
1008          $successful_plugins = ( ! empty( $successful_updates['plugin'] ) );
1009          $successful_themes  = ( ! empty( $successful_updates['theme'] ) );
1010          $failed_plugins     = ( ! empty( $failed_updates['plugin'] ) );
1011          $failed_themes      = ( ! empty( $failed_updates['theme'] ) );
1012  
1013          switch ( $type ) {
1014              case 'success':
1015                  if ( $successful_plugins && $successful_themes ) {
1016                      /* translators: %s: Site title. */
1017                      $subject = __( '[%s] Some plugins and themes have automatically updated' );
1018                      $body[]  = sprintf(
1019                          /* translators: %s: Home URL. */
1020                          __( '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.' ),
1021                          home_url()
1022                      );
1023                  } elseif ( $successful_plugins ) {
1024                      /* translators: %s: Site title. */
1025                      $subject = __( '[%s] Some plugins were automatically updated' );
1026                      $body[]  = sprintf(
1027                          /* translators: %s: Home URL. */
1028                          __( 'Howdy! Some plugins have automatically updated to their latest versions on your site at %s. No further action is needed on your part.' ),
1029                          home_url()
1030                      );
1031                  } else {
1032                      /* translators: %s: Site title. */
1033                      $subject = __( '[%s] Some themes were automatically updated' );
1034                      $body[]  = sprintf(
1035                          /* translators: %s: Home URL. */
1036                          __( 'Howdy! Some themes have automatically updated to their latest versions on your site at %s. No further action is needed on your part.' ),
1037                          home_url()
1038                      );
1039                  }
1040  
1041                  break;
1042              case 'fail':
1043              case 'mixed':
1044                  if ( $failed_plugins && $failed_themes ) {
1045                      /* translators: %s: Site title. */
1046                      $subject = __( '[%s] Some plugins and themes have failed to update' );
1047                      $body[]  = sprintf(
1048                          /* translators: %s: Home URL. */
1049                          __( 'Howdy! Plugins and themes failed to update on your site at %s.' ),
1050                          home_url()
1051                      );
1052                  } elseif ( $failed_plugins ) {
1053                      /* translators: %s: Site title. */
1054                      $subject = __( '[%s] Some plugins have failed to update' );
1055                      $body[]  = sprintf(
1056                          /* translators: %s: Home URL. */
1057                          __( 'Howdy! Plugins failed to update on your site at %s.' ),
1058                          home_url()
1059                      );
1060                  } else {
1061                      /* translators: %s: Site title. */
1062                      $subject = __( '[%s] Some themes have failed to update' );
1063                      $body[]  = sprintf(
1064                          /* translators: %s: Home URL. */
1065                          __( 'Howdy! Themes failed to update on your site at %s.' ),
1066                          home_url()
1067                      );
1068                  }
1069  
1070                  break;
1071          }
1072  
1073          if ( in_array( $type, array( 'fail', 'mixed' ), true ) ) {
1074              $body[] = "\n";
1075              $body[] = __( 'Please check your site now. It’s possible that everything is working. If there are updates available, you should update.' );
1076              $body[] = "\n";
1077  
1078              // List failed plugin updates.
1079              if ( ! empty( $failed_updates['plugin'] ) ) {
1080                  $body[] = __( 'These plugins failed to update:' );
1081  
1082                  foreach ( $failed_updates['plugin'] as $item ) {
1083                      if ( $item->item->current_version ) {
1084                          $body[] = sprintf(
1085                              /* translators: 1: Plugin name, 2: Current version number, 3: New version number. */
1086                              __( '- %1$s (from version %2$s to %3$s)' ),
1087                              $item->name,
1088                              $item->item->current_version,
1089                              $item->item->new_version
1090                          );
1091                      } else {
1092                          $body[] = sprintf(
1093                              /* translators: 1: Plugin name, 2: Version number. */
1094                              __( '- %1$s version %2$s' ),
1095                              $item->name,
1096                              $item->item->new_version
1097                          );
1098                      }
1099  
1100                      $past_failure_emails[ $item->item->plugin ] = $item->item->new_version;
1101                  }
1102  
1103                  $body[] = "\n";
1104              }
1105  
1106              // List failed theme updates.
1107              if ( ! empty( $failed_updates['theme'] ) ) {
1108                  $body[] = __( 'These themes failed to update:' );
1109  
1110                  foreach ( $failed_updates['theme'] as $item ) {
1111                      if ( $item->item->current_version ) {
1112                          $body[] = sprintf(
1113                              /* translators: 1: Theme name, 2: Current version number, 3: New version number. */
1114                              __( '- %1$s (from version %2$s to %3$s)' ),
1115                              $item->name,
1116                              $item->item->current_version,
1117                              $item->item->new_version
1118                          );
1119                      } else {
1120                          $body[] = sprintf(
1121                              /* translators: 1: Theme name, 2: Version number. */
1122                              __( '- %1$s version %2$s' ),
1123                              $item->name,
1124                              $item->item->new_version
1125                          );
1126                      }
1127  
1128                      $past_failure_emails[ $item->item->theme ] = $item->item->new_version;
1129                  }
1130  
1131                  $body[] = "\n";
1132              }
1133          }
1134  
1135          // List successful updates.
1136          if ( in_array( $type, array( 'success', 'mixed' ), true ) ) {
1137              $body[] = "\n";
1138  
1139              // List successful plugin updates.
1140              if ( ! empty( $successful_updates['plugin'] ) ) {
1141                  $body[] = __( 'These plugins are now up to date:' );
1142  
1143                  foreach ( $successful_updates['plugin'] as $item ) {
1144                      if ( $item->item->current_version ) {
1145                          $body[] = sprintf(
1146                              /* translators: 1: Plugin name, 2: Current version number, 3: New version number. */
1147                              __( '- %1$s (from version %2$s to %3$s)' ),
1148                              $item->name,
1149                              $item->item->current_version,
1150                              $item->item->new_version
1151                          );
1152                      } else {
1153                          $body[] = sprintf(
1154                              /* translators: 1: Plugin name, 2: Version number. */
1155                              __( '- %1$s version %2$s' ),
1156                              $item->name,
1157                              $item->item->new_version
1158                          );
1159                      }
1160  
1161                      unset( $past_failure_emails[ $item->item->plugin ] );
1162                  }
1163  
1164                  $body[] = "\n";
1165              }
1166  
1167              // List successful theme updates.
1168              if ( ! empty( $successful_updates['theme'] ) ) {
1169                  $body[] = __( 'These themes are now up to date:' );
1170  
1171                  foreach ( $successful_updates['theme'] as $item ) {
1172                      if ( $item->item->current_version ) {
1173                          $body[] = sprintf(
1174                              /* translators: 1: Theme name, 2: Current version number, 3: New version number. */
1175                              __( '- %1$s (from version %2$s to %3$s)' ),
1176                              $item->name,
1177                              $item->item->current_version,
1178                              $item->item->new_version
1179                          );
1180                      } else {
1181                          $body[] = sprintf(
1182                               /* translators: 1: Theme name, 2: Version number. */
1183                              __( '- %1$s version %2$s' ),
1184                              $item->name,
1185                              $item->item->new_version
1186                          );
1187                      }
1188  
1189                      unset( $past_failure_emails[ $item->item->theme ] );
1190                  }
1191  
1192                  $body[] = "\n";
1193              }
1194          }
1195  
1196          if ( $failed_plugins ) {
1197              $body[] = sprintf(
1198                  /* translators: %s: Plugins screen URL. */
1199                  __( 'To manage plugins on your site, visit the Plugins page: %s' ),
1200                  admin_url( 'plugins.php' )
1201              );
1202              $body[] = "\n";
1203          }
1204  
1205          if ( $failed_themes ) {
1206              $body[] = sprintf(
1207                  /* translators: %s: Themes screen URL. */
1208                  __( 'To manage themes on your site, visit the Themes page: %s' ),
1209                  admin_url( 'themes.php' )
1210              );
1211              $body[] = "\n";
1212          }
1213  
1214          // Add a note about the support forums.
1215          $body[] = __( 'If you experience any issues or need support, the volunteers in the WordPress.org support forums may be able to help.' );
1216          $body[] = __( 'https://wordpress.org/support/forums/' );
1217          $body[] = "\n" . __( 'The WordPress Team' );
1218  
1219          $body    = implode( "\n", $body );
1220          $to      = get_site_option( 'admin_email' );
1221          $subject = sprintf( $subject, wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ) );
1222          $headers = '';
1223  
1224          $email = compact( 'to', 'subject', 'body', 'headers' );
1225  
1226          /**
1227           * Filters the email sent following an automatic background update for plugins and themes.
1228           *
1229           * @since 5.5.0
1230           *
1231           * @param array  $email {
1232           *     Array of email arguments that will be passed to wp_mail().
1233           *
1234           *     @type string $to      The email recipient. An array of emails
1235           *                           can be returned, as handled by wp_mail().
1236           *     @type string $subject The email's subject.
1237           *     @type string $body    The email message body.
1238           *     @type string $headers Any email headers, defaults to no headers.
1239           * }
1240           * @param string $type               The type of email being sent. Can be one of 'success', 'fail', 'mixed'.
1241           * @param array  $successful_updates A list of updates that succeeded.
1242           * @param array  $failed_updates     A list of updates that failed.
1243           */
1244          $email = apply_filters( 'auto_plugin_theme_update_email', $email, $type, $successful_updates, $failed_updates );
1245  
1246          $result = wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
1247  
1248          if ( $result ) {
1249              update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );
1250          }
1251      }
1252  
1253      /**
1254       * Prepares and sends an email of a full log of background update results, useful for debugging and geekery.
1255       *
1256       * @since 3.7.0
1257       */
1258  	protected function send_debug_email() {
1259          $update_count = 0;
1260          foreach ( $this->update_results as $type => $updates ) {
1261              $update_count += count( $updates );
1262          }
1263  
1264          $body     = array();
1265          $failures = 0;
1266  
1267          /* translators: %s: Network home URL. */
1268          $body[] = sprintf( __( 'WordPress site: %s' ), network_home_url( '/' ) );
1269  
1270          // Core.
1271          if ( isset( $this->update_results['core'] ) ) {
1272              $result = $this->update_results['core'][0];
1273              if ( $result->result && ! is_wp_error( $result->result ) ) {
1274                  /* translators: %s: WordPress version. */
1275                  $body[] = sprintf( __( 'SUCCESS: WordPress was successfully updated to %s' ), $result->name );
1276              } else {
1277                  /* translators: %s: WordPress version. */
1278                  $body[] = sprintf( __( 'FAILED: WordPress failed to update to %s' ), $result->name );
1279                  $failures++;
1280              }
1281              $body[] = '';
1282          }
1283  
1284          // Plugins, Themes, Translations.
1285          foreach ( array( 'plugin', 'theme', 'translation' ) as $type ) {
1286              if ( ! isset( $this->update_results[ $type ] ) ) {
1287                  continue;
1288              }
1289              $success_items = wp_list_filter( $this->update_results[ $type ], array( 'result' => true ) );
1290              if ( $success_items ) {
1291                  $messages = array(
1292                      'plugin'      => __( 'The following plugins were successfully updated:' ),
1293                      'theme'       => __( 'The following themes were successfully updated:' ),
1294                      'translation' => __( 'The following translations were successfully updated:' ),
1295                  );
1296  
1297                  $body[] = $messages[ $type ];
1298                  foreach ( wp_list_pluck( $success_items, 'name' ) as $name ) {
1299                      /* translators: %s: Name of plugin / theme / translation. */
1300                      $body[] = ' * ' . sprintf( __( 'SUCCESS: %s' ), $name );
1301                  }
1302              }
1303              if ( $success_items != $this->update_results[ $type ] ) {
1304                  // Failed updates.
1305                  $messages = array(
1306                      'plugin'      => __( 'The following plugins failed to update:' ),
1307                      'theme'       => __( 'The following themes failed to update:' ),
1308                      'translation' => __( 'The following translations failed to update:' ),
1309                  );
1310  
1311                  $body[] = $messages[ $type ];
1312                  foreach ( $this->update_results[ $type ] as $item ) {
1313                      if ( ! $item->result || is_wp_error( $item->result ) ) {
1314                          /* translators: %s: Name of plugin / theme / translation. */
1315                          $body[] = ' * ' . sprintf( __( 'FAILED: %s' ), $item->name );
1316                          $failures++;
1317                      }
1318                  }
1319              }
1320              $body[] = '';
1321          }
1322  
1323          $site_title = wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES );
1324          if ( $failures ) {
1325              $body[] = trim(
1326                  __(
1327                      "BETA TESTING?
1328  =============
1329  
1330  This debugging email is sent when you are using a development version of WordPress.
1331  
1332  If you think these failures might be due to a bug in WordPress, could you report it?
1333   * Open a thread in the support forums: https://wordpress.org/support/forum/alphabeta
1334   * Or, if you're comfortable writing a bug report: https://core.trac.wordpress.org/
1335  
1336  Thanks! -- The WordPress Team"
1337                  )
1338              );
1339              $body[] = '';
1340  
1341              /* translators: Background update failed notification email subject. %s: Site title. */
1342              $subject = sprintf( __( '[%s] Background Update Failed' ), $site_title );
1343          } else {
1344              /* translators: Background update finished notification email subject. %s: Site title. */
1345              $subject = sprintf( __( '[%s] Background Update Finished' ), $site_title );
1346          }
1347  
1348          $body[] = trim(
1349              __(
1350                  'UPDATE LOG
1351  =========='
1352              )
1353          );
1354          $body[] = '';
1355  
1356          foreach ( array( 'core', 'plugin', 'theme', 'translation' ) as $type ) {
1357              if ( ! isset( $this->update_results[ $type ] ) ) {
1358                  continue;
1359              }
1360              foreach ( $this->update_results[ $type ] as $update ) {
1361                  $body[] = $update->name;
1362                  $body[] = str_repeat( '-', strlen( $update->name ) );
1363                  foreach ( $update->messages as $message ) {
1364                      $body[] = '  ' . html_entity_decode( str_replace( '&#8230;', '...', $message ) );
1365                  }
1366                  if ( is_wp_error( $update->result ) ) {
1367                      $results = array( 'update' => $update->result );
1368                      // If we rolled back, we want to know an error that occurred then too.
1369                      if ( 'rollback_was_required' === $update->result->get_error_code() ) {
1370                          $results = (array) $update->result->get_error_data();
1371                      }
1372                      foreach ( $results as $result_type => $result ) {
1373                          if ( ! is_wp_error( $result ) ) {
1374                              continue;
1375                          }
1376  
1377                          if ( 'rollback' === $result_type ) {
1378                              /* translators: 1: Error code, 2: Error message. */
1379                              $body[] = '  ' . sprintf( __( 'Rollback Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
1380                          } else {
1381                              /* translators: 1: Error code, 2: Error message. */
1382                              $body[] = '  ' . sprintf( __( 'Error: [%1$s] %2$s' ), $result->get_error_code(), $result->get_error_message() );
1383                          }
1384  
1385                          if ( $result->get_error_data() ) {
1386                              $body[] = '         ' . implode( ', ', (array) $result->get_error_data() );
1387                          }
1388                      }
1389                  }
1390                  $body[] = '';
1391              }
1392          }
1393  
1394          $email = array(
1395              'to'      => get_site_option( 'admin_email' ),
1396              'subject' => $subject,
1397              'body'    => implode( "\n", $body ),
1398              'headers' => '',
1399          );
1400  
1401          /**
1402           * Filters the debug email that can be sent following an automatic
1403           * background core update.
1404           *
1405           * @since 3.8.0
1406           *
1407           * @param array $email {
1408           *     Array of email arguments that will be passed to wp_mail().
1409           *
1410           *     @type string $to      The email recipient. An array of emails
1411           *                           can be returned, as handled by wp_mail().
1412           *     @type string $subject Email subject.
1413           *     @type string $body    Email message body.
1414           *     @type string $headers Any email headers. Default empty.
1415           * }
1416           * @param int   $failures The number of failures encountered while upgrading.
1417           * @param mixed $results  The results of all attempted updates.
1418           */
1419          $email = apply_filters( 'automatic_updates_debug_email', $email, $failures, $this->update_results );
1420  
1421          wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
1422      }
1423  }


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