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/wp-includes/ -> update.php (source)

   1  <?php
   2  /**
   3   * A simple set of functions to check our version 1.0 update service.
   4   *
   5   * @package WordPress
   6   * @since 2.3.0
   7   */
   8  
   9  /**
  10   * Check WordPress version against the newest version.
  11   *
  12   * The WordPress version, PHP version, and locale is sent.
  13   *
  14   * Checks against the WordPress server at api.wordpress.org. Will only check
  15   * if WordPress isn't installing.
  16   *
  17   * @since 2.3.0
  18   *
  19   * @global string $wp_version       Used to check against the newest WordPress version.
  20   * @global wpdb   $wpdb             WordPress database abstraction object.
  21   * @global string $wp_local_package Locale code of the package.
  22   *
  23   * @param array $extra_stats Extra statistics to report to the WordPress.org API.
  24   * @param bool  $force_check Whether to bypass the transient cache and force a fresh update check. Defaults to false, true if $extra_stats is set.
  25   */
  26  function wp_version_check( $extra_stats = array(), $force_check = false ) {
  27      global $wpdb, $wp_local_package;
  28  
  29      if ( wp_installing() ) {
  30          return;
  31      }
  32  
  33      // Include an unmodified $wp_version.
  34      require  ABSPATH . WPINC . '/version.php';
  35      $php_version = phpversion();
  36  
  37      $current      = get_site_transient( 'update_core' );
  38      $translations = wp_get_installed_translations( 'core' );
  39  
  40      // Invalidate the transient when $wp_version changes.
  41      if ( is_object( $current ) && $wp_version !== $current->version_checked ) {
  42          $current = false;
  43      }
  44  
  45      if ( ! is_object( $current ) ) {
  46          $current                  = new stdClass;
  47          $current->updates         = array();
  48          $current->version_checked = $wp_version;
  49      }
  50  
  51      if ( ! empty( $extra_stats ) ) {
  52          $force_check = true;
  53      }
  54  
  55      // Wait 1 minute between multiple version check requests.
  56      $timeout          = MINUTE_IN_SECONDS;
  57      $time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );
  58  
  59      if ( ! $force_check && $time_not_changed ) {
  60          return;
  61      }
  62  
  63      /**
  64       * Filters the locale requested for WordPress core translations.
  65       *
  66       * @since 2.8.0
  67       *
  68       * @param string $locale Current locale.
  69       */
  70      $locale = apply_filters( 'core_version_check_locale', get_locale() );
  71  
  72      // Update last_checked for current to prevent multiple blocking requests if request hangs.
  73      $current->last_checked = time();
  74      set_site_transient( 'update_core', $current );
  75  
  76      if ( method_exists( $wpdb, 'db_version' ) ) {
  77          $mysql_version = preg_replace( '/[^0-9.].*/', '', $wpdb->db_version() );
  78      } else {
  79          $mysql_version = 'N/A';
  80      }
  81  
  82      if ( is_multisite() ) {
  83          $user_count        = get_user_count();
  84          $num_blogs         = get_blog_count();
  85          $wp_install        = network_site_url();
  86          $multisite_enabled = 1;
  87      } else {
  88          $user_count        = count_users();
  89          $user_count        = $user_count['total_users'];
  90          $multisite_enabled = 0;
  91          $num_blogs         = 1;
  92          $wp_install        = home_url( '/' );
  93      }
  94  
  95      $query = array(
  96          'version'            => $wp_version,
  97          'php'                => $php_version,
  98          'locale'             => $locale,
  99          'mysql'              => $mysql_version,
 100          'local_package'      => isset( $wp_local_package ) ? $wp_local_package : '',
 101          'blogs'              => $num_blogs,
 102          'users'              => $user_count,
 103          'multisite_enabled'  => $multisite_enabled,
 104          'initial_db_version' => get_site_option( 'initial_db_version' ),
 105      );
 106  
 107      /**
 108       * Filters the query arguments sent as part of the core version check.
 109       *
 110       * WARNING: Changing this data may result in your site not receiving security updates.
 111       * Please exercise extreme caution.
 112       *
 113       * @since 4.9.0
 114       *
 115       * @param array $query {
 116       *     Version check query arguments.
 117       *
 118       *     @type string $version            WordPress version number.
 119       *     @type string $php                PHP version number.
 120       *     @type string $locale             The locale to retrieve updates for.
 121       *     @type string $mysql              MySQL version number.
 122       *     @type string $local_package      The value of the $wp_local_package global, when set.
 123       *     @type int    $blogs              Number of sites on this WordPress installation.
 124       *     @type int    $users              Number of users on this WordPress installation.
 125       *     @type int    $multisite_enabled  Whether this WordPress installation uses Multisite.
 126       *     @type int    $initial_db_version Database version of WordPress at time of installation.
 127       * }
 128       */
 129      $query = apply_filters( 'core_version_check_query_args', $query );
 130  
 131      $post_body = array(
 132          'translations' => wp_json_encode( $translations ),
 133      );
 134  
 135      if ( is_array( $extra_stats ) ) {
 136          $post_body = array_merge( $post_body, $extra_stats );
 137      }
 138  
 139      // Allow for WP_AUTO_UPDATE_CORE to specify beta/RC/development releases.
 140      if ( defined( 'WP_AUTO_UPDATE_CORE' )
 141          && in_array( WP_AUTO_UPDATE_CORE, array( 'beta', 'rc', 'development', 'branch-development' ), true )
 142      ) {
 143          $query['channel'] = WP_AUTO_UPDATE_CORE;
 144      }
 145  
 146      $url      = 'http://api.wordpress.org/core/version-check/1.7/?' . http_build_query( $query, null, '&' );
 147      $http_url = $url;
 148      $ssl      = wp_http_supports( array( 'ssl' ) );
 149  
 150      if ( $ssl ) {
 151          $url = set_url_scheme( $url, 'https' );
 152      }
 153  
 154      $doing_cron = wp_doing_cron();
 155  
 156      $options = array(
 157          'timeout'    => $doing_cron ? 30 : 3,
 158          'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
 159          'headers'    => array(
 160              'wp_install' => $wp_install,
 161              'wp_blog'    => home_url( '/' ),
 162          ),
 163          'body'       => $post_body,
 164      );
 165  
 166      $response = wp_remote_post( $url, $options );
 167  
 168      if ( $ssl && is_wp_error( $response ) ) {
 169          trigger_error(
 170              sprintf(
 171                  /* translators: %s: Support forums URL. */
 172                  __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
 173                  __( 'https://wordpress.org/support/forums/' )
 174              ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
 175              headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
 176          );
 177          $response = wp_remote_post( $http_url, $options );
 178      }
 179  
 180      if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {
 181          return;
 182      }
 183  
 184      $body = trim( wp_remote_retrieve_body( $response ) );
 185      $body = json_decode( $body, true );
 186  
 187      if ( ! is_array( $body ) || ! isset( $body['offers'] ) ) {
 188          return;
 189      }
 190  
 191      $offers = $body['offers'];
 192  
 193      foreach ( $offers as &$offer ) {
 194          foreach ( $offer as $offer_key => $value ) {
 195              if ( 'packages' === $offer_key ) {
 196                  $offer['packages'] = (object) array_intersect_key(
 197                      array_map( 'esc_url', $offer['packages'] ),
 198                      array_fill_keys( array( 'full', 'no_content', 'new_bundled', 'partial', 'rollback' ), '' )
 199                  );
 200              } elseif ( 'download' === $offer_key ) {
 201                  $offer['download'] = esc_url( $value );
 202              } else {
 203                  $offer[ $offer_key ] = esc_html( $value );
 204              }
 205          }
 206          $offer = (object) array_intersect_key(
 207              $offer,
 208              array_fill_keys(
 209                  array(
 210                      'response',
 211                      'download',
 212                      'locale',
 213                      'packages',
 214                      'current',
 215                      'version',
 216                      'php_version',
 217                      'mysql_version',
 218                      'new_bundled',
 219                      'partial_version',
 220                      'notify_email',
 221                      'support_email',
 222                      'new_files',
 223                  ),
 224                  ''
 225              )
 226          );
 227      }
 228  
 229      $updates                  = new stdClass();
 230      $updates->updates         = $offers;
 231      $updates->last_checked    = time();
 232      $updates->version_checked = $wp_version;
 233  
 234      if ( isset( $body['translations'] ) ) {
 235          $updates->translations = $body['translations'];
 236      }
 237  
 238      set_site_transient( 'update_core', $updates );
 239  
 240      if ( ! empty( $body['ttl'] ) ) {
 241          $ttl = (int) $body['ttl'];
 242  
 243          if ( $ttl && ( time() + $ttl < wp_next_scheduled( 'wp_version_check' ) ) ) {
 244              // Queue an event to re-run the update check in $ttl seconds.
 245              wp_schedule_single_event( time() + $ttl, 'wp_version_check' );
 246          }
 247      }
 248  
 249      // Trigger background updates if running non-interactively, and we weren't called from the update handler.
 250      if ( $doing_cron && ! doing_action( 'wp_maybe_auto_update' ) ) {
 251          /**
 252           * Fires during wp_cron, starting the auto-update process.
 253           *
 254           * @since 3.9.0
 255           */
 256          do_action( 'wp_maybe_auto_update' );
 257      }
 258  }
 259  
 260  /**
 261   * Checks for available updates to plugins based on the latest versions hosted on WordPress.org.
 262   *
 263   * Despite its name this function does not actually perform any updates, it only checks for available updates.
 264   *
 265   * A list of all plugins installed is sent to WP, along with the site locale.
 266   *
 267   * Checks against the WordPress server at api.wordpress.org. Will only check
 268   * if WordPress isn't installing.
 269   *
 270   * @since 2.3.0
 271   *
 272   * @global string $wp_version The WordPress version string.
 273   *
 274   * @param array $extra_stats Extra statistics to report to the WordPress.org API.
 275   */
 276  function wp_update_plugins( $extra_stats = array() ) {
 277      if ( wp_installing() ) {
 278          return;
 279      }
 280  
 281      // Include an unmodified $wp_version.
 282      require  ABSPATH . WPINC . '/version.php';
 283  
 284      // If running blog-side, bail unless we've not checked in the last 12 hours.
 285      if ( ! function_exists( 'get_plugins' ) ) {
 286          require_once ABSPATH . 'wp-admin/includes/plugin.php';
 287      }
 288  
 289      $plugins      = get_plugins();
 290      $translations = wp_get_installed_translations( 'plugins' );
 291  
 292      $active  = get_option( 'active_plugins', array() );
 293      $current = get_site_transient( 'update_plugins' );
 294  
 295      if ( ! is_object( $current ) ) {
 296          $current = new stdClass;
 297      }
 298  
 299      $new_option               = new stdClass;
 300      $new_option->last_checked = time();
 301  
 302      $doing_cron = wp_doing_cron();
 303  
 304      // Check for update on a different schedule, depending on the page.
 305      switch ( current_filter() ) {
 306          case 'upgrader_process_complete':
 307              $timeout = 0;
 308              break;
 309          case 'load-update-core.php':
 310              $timeout = MINUTE_IN_SECONDS;
 311              break;
 312          case 'load-plugins.php':
 313          case 'load-update.php':
 314              $timeout = HOUR_IN_SECONDS;
 315              break;
 316          default:
 317              if ( $doing_cron ) {
 318                  $timeout = 2 * HOUR_IN_SECONDS;
 319              } else {
 320                  $timeout = 12 * HOUR_IN_SECONDS;
 321              }
 322      }
 323  
 324      $time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );
 325  
 326      if ( $time_not_changed && ! $extra_stats ) {
 327          $plugin_changed = false;
 328  
 329          foreach ( $plugins as $file => $p ) {
 330              $new_option->checked[ $file ] = $p['Version'];
 331  
 332              if ( ! isset( $current->checked[ $file ] ) || (string) $current->checked[ $file ] !== (string) $p['Version'] ) {
 333                  $plugin_changed = true;
 334              }
 335          }
 336  
 337          if ( isset( $current->response ) && is_array( $current->response ) ) {
 338              foreach ( $current->response as $plugin_file => $update_details ) {
 339                  if ( ! isset( $plugins[ $plugin_file ] ) ) {
 340                      $plugin_changed = true;
 341                      break;
 342                  }
 343              }
 344          }
 345  
 346          // Bail if we've checked recently and if nothing has changed.
 347          if ( ! $plugin_changed ) {
 348              return;
 349          }
 350      }
 351  
 352      // Update last_checked for current to prevent multiple blocking requests if request hangs.
 353      $current->last_checked = time();
 354      set_site_transient( 'update_plugins', $current );
 355  
 356      $to_send = compact( 'plugins', 'active' );
 357  
 358      $locales = array_values( get_available_languages() );
 359  
 360      /**
 361       * Filters the locales requested for plugin translations.
 362       *
 363       * @since 3.7.0
 364       * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
 365       *
 366       * @param array $locales Plugin locales. Default is all available locales of the site.
 367       */
 368      $locales = apply_filters( 'plugins_update_check_locales', $locales );
 369      $locales = array_unique( $locales );
 370  
 371      if ( $doing_cron ) {
 372          $timeout = 30;
 373      } else {
 374          // Three seconds, plus one extra second for every 10 plugins.
 375          $timeout = 3 + (int) ( count( $plugins ) / 10 );
 376      }
 377  
 378      $options = array(
 379          'timeout'    => $timeout,
 380          'body'       => array(
 381              'plugins'      => wp_json_encode( $to_send ),
 382              'translations' => wp_json_encode( $translations ),
 383              'locale'       => wp_json_encode( $locales ),
 384              'all'          => wp_json_encode( true ),
 385          ),
 386          'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
 387      );
 388  
 389      if ( $extra_stats ) {
 390          $options['body']['update_stats'] = wp_json_encode( $extra_stats );
 391      }
 392  
 393      $url      = 'http://api.wordpress.org/plugins/update-check/1.1/';
 394      $http_url = $url;
 395      $ssl      = wp_http_supports( array( 'ssl' ) );
 396  
 397      if ( $ssl ) {
 398          $url = set_url_scheme( $url, 'https' );
 399      }
 400  
 401      $raw_response = wp_remote_post( $url, $options );
 402  
 403      if ( $ssl && is_wp_error( $raw_response ) ) {
 404          trigger_error(
 405              sprintf(
 406                  /* translators: %s: Support forums URL. */
 407                  __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
 408                  __( 'https://wordpress.org/support/forums/' )
 409              ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
 410              headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
 411          );
 412          $raw_response = wp_remote_post( $http_url, $options );
 413      }
 414  
 415      if ( is_wp_error( $raw_response ) || 200 !== wp_remote_retrieve_response_code( $raw_response ) ) {
 416          return;
 417      }
 418  
 419      $response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
 420  
 421      foreach ( $response['plugins'] as &$plugin ) {
 422          $plugin = (object) $plugin;
 423  
 424          if ( isset( $plugin->compatibility ) ) {
 425              $plugin->compatibility = (object) $plugin->compatibility;
 426  
 427              foreach ( $plugin->compatibility as &$data ) {
 428                  $data = (object) $data;
 429              }
 430          }
 431      }
 432  
 433      unset( $plugin, $data );
 434  
 435      foreach ( $response['no_update'] as &$plugin ) {
 436          $plugin = (object) $plugin;
 437      }
 438  
 439      unset( $plugin );
 440  
 441      if ( is_array( $response ) ) {
 442          $new_option->response     = $response['plugins'];
 443          $new_option->translations = $response['translations'];
 444          // TODO: Perhaps better to store no_update in a separate transient with an expiry?
 445          $new_option->no_update = $response['no_update'];
 446      } else {
 447          $new_option->response     = array();
 448          $new_option->translations = array();
 449          $new_option->no_update    = array();
 450      }
 451  
 452      set_site_transient( 'update_plugins', $new_option );
 453  }
 454  
 455  /**
 456   * Checks for available updates to themes based on the latest versions hosted on WordPress.org.
 457   *
 458   * Despite its name this function does not actually perform any updates, it only checks for available updates.
 459   *
 460   * A list of all themes installed is sent to WP, along with the site locale.
 461   *
 462   * Checks against the WordPress server at api.wordpress.org. Will only check
 463   * if WordPress isn't installing.
 464   *
 465   * @since 2.7.0
 466   *
 467   * @global string $wp_version The WordPress version string.
 468   *
 469   * @param array $extra_stats Extra statistics to report to the WordPress.org API.
 470   */
 471  function wp_update_themes( $extra_stats = array() ) {
 472      if ( wp_installing() ) {
 473          return;
 474      }
 475  
 476      // Include an unmodified $wp_version.
 477      require  ABSPATH . WPINC . '/version.php';
 478  
 479      $installed_themes = wp_get_themes();
 480      $translations     = wp_get_installed_translations( 'themes' );
 481  
 482      $last_update = get_site_transient( 'update_themes' );
 483  
 484      if ( ! is_object( $last_update ) ) {
 485          $last_update = new stdClass;
 486      }
 487  
 488      $themes  = array();
 489      $checked = array();
 490      $request = array();
 491  
 492      // Put slug of current theme into request.
 493      $request['active'] = get_option( 'stylesheet' );
 494  
 495      foreach ( $installed_themes as $theme ) {
 496          $checked[ $theme->get_stylesheet() ] = $theme->get( 'Version' );
 497  
 498          $themes[ $theme->get_stylesheet() ] = array(
 499              'Name'       => $theme->get( 'Name' ),
 500              'Title'      => $theme->get( 'Name' ),
 501              'Version'    => $theme->get( 'Version' ),
 502              'Author'     => $theme->get( 'Author' ),
 503              'Author URI' => $theme->get( 'AuthorURI' ),
 504              'Template'   => $theme->get_template(),
 505              'Stylesheet' => $theme->get_stylesheet(),
 506          );
 507      }
 508  
 509      $doing_cron = wp_doing_cron();
 510  
 511      // Check for update on a different schedule, depending on the page.
 512      switch ( current_filter() ) {
 513          case 'upgrader_process_complete':
 514              $timeout = 0;
 515              break;
 516          case 'load-update-core.php':
 517              $timeout = MINUTE_IN_SECONDS;
 518              break;
 519          case 'load-themes.php':
 520          case 'load-update.php':
 521              $timeout = HOUR_IN_SECONDS;
 522              break;
 523          default:
 524              if ( $doing_cron ) {
 525                  $timeout = 2 * HOUR_IN_SECONDS;
 526              } else {
 527                  $timeout = 12 * HOUR_IN_SECONDS;
 528              }
 529      }
 530  
 531      $time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time() - $last_update->last_checked );
 532  
 533      if ( $time_not_changed && ! $extra_stats ) {
 534          $theme_changed = false;
 535  
 536          foreach ( $checked as $slug => $v ) {
 537              if ( ! isset( $last_update->checked[ $slug ] ) || (string) $last_update->checked[ $slug ] !== (string) $v ) {
 538                  $theme_changed = true;
 539              }
 540          }
 541  
 542          if ( isset( $last_update->response ) && is_array( $last_update->response ) ) {
 543              foreach ( $last_update->response as $slug => $update_details ) {
 544                  if ( ! isset( $checked[ $slug ] ) ) {
 545                      $theme_changed = true;
 546                      break;
 547                  }
 548              }
 549          }
 550  
 551          // Bail if we've checked recently and if nothing has changed.
 552          if ( ! $theme_changed ) {
 553              return;
 554          }
 555      }
 556  
 557      // Update last_checked for current to prevent multiple blocking requests if request hangs.
 558      $last_update->last_checked = time();
 559      set_site_transient( 'update_themes', $last_update );
 560  
 561      $request['themes'] = $themes;
 562  
 563      $locales = array_values( get_available_languages() );
 564  
 565      /**
 566       * Filters the locales requested for theme translations.
 567       *
 568       * @since 3.7.0
 569       * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
 570       *
 571       * @param array $locales Theme locales. Default is all available locales of the site.
 572       */
 573      $locales = apply_filters( 'themes_update_check_locales', $locales );
 574      $locales = array_unique( $locales );
 575  
 576      if ( $doing_cron ) {
 577          $timeout = 30;
 578      } else {
 579          // Three seconds, plus one extra second for every 10 themes.
 580          $timeout = 3 + (int) ( count( $themes ) / 10 );
 581      }
 582  
 583      $options = array(
 584          'timeout'    => $timeout,
 585          'body'       => array(
 586              'themes'       => wp_json_encode( $request ),
 587              'translations' => wp_json_encode( $translations ),
 588              'locale'       => wp_json_encode( $locales ),
 589          ),
 590          'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
 591      );
 592  
 593      if ( $extra_stats ) {
 594          $options['body']['update_stats'] = wp_json_encode( $extra_stats );
 595      }
 596  
 597      $url      = 'http://api.wordpress.org/themes/update-check/1.1/';
 598      $http_url = $url;
 599      $ssl      = wp_http_supports( array( 'ssl' ) );
 600  
 601      if ( $ssl ) {
 602          $url = set_url_scheme( $url, 'https' );
 603      }
 604  
 605      $raw_response = wp_remote_post( $url, $options );
 606  
 607      if ( $ssl && is_wp_error( $raw_response ) ) {
 608          trigger_error(
 609              sprintf(
 610                  /* translators: %s: Support forums URL. */
 611                  __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
 612                  __( 'https://wordpress.org/support/forums/' )
 613              ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
 614              headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
 615          );
 616          $raw_response = wp_remote_post( $http_url, $options );
 617      }
 618  
 619      if ( is_wp_error( $raw_response ) || 200 !== wp_remote_retrieve_response_code( $raw_response ) ) {
 620          return;
 621      }
 622  
 623      $new_update               = new stdClass;
 624      $new_update->last_checked = time();
 625      $new_update->checked      = $checked;
 626  
 627      $response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
 628  
 629      if ( is_array( $response ) ) {
 630          $new_update->response     = $response['themes'];
 631          $new_update->no_update    = $response['no_update'];
 632          $new_update->translations = $response['translations'];
 633      }
 634  
 635      set_site_transient( 'update_themes', $new_update );
 636  }
 637  
 638  /**
 639   * Performs WordPress automatic background updates.
 640   *
 641   * Updates WordPress core plus any plugins and themes that have automatic updates enabled.
 642   *
 643   * @since 3.7.0
 644   */
 645  function wp_maybe_auto_update() {
 646      include_once  ABSPATH . 'wp-admin/includes/admin.php';
 647      require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 648  
 649      $upgrader = new WP_Automatic_Updater;
 650      $upgrader->run();
 651  }
 652  
 653  /**
 654   * Retrieves a list of all language updates available.
 655   *
 656   * @since 3.7.0
 657   *
 658   * @return object[] Array of translation objects that have available updates.
 659   */
 660  function wp_get_translation_updates() {
 661      $updates    = array();
 662      $transients = array(
 663          'update_core'    => 'core',
 664          'update_plugins' => 'plugin',
 665          'update_themes'  => 'theme',
 666      );
 667  
 668      foreach ( $transients as $transient => $type ) {
 669          $transient = get_site_transient( $transient );
 670  
 671          if ( empty( $transient->translations ) ) {
 672              continue;
 673          }
 674  
 675          foreach ( $transient->translations as $translation ) {
 676              $updates[] = (object) $translation;
 677          }
 678      }
 679  
 680      return $updates;
 681  }
 682  
 683  /**
 684   * Collect counts and UI strings for available updates
 685   *
 686   * @since 3.3.0
 687   *
 688   * @return array
 689   */
 690  function wp_get_update_data() {
 691      $counts = array(
 692          'plugins'      => 0,
 693          'themes'       => 0,
 694          'wordpress'    => 0,
 695          'translations' => 0,
 696      );
 697  
 698      $plugins = current_user_can( 'update_plugins' );
 699  
 700      if ( $plugins ) {
 701          $update_plugins = get_site_transient( 'update_plugins' );
 702  
 703          if ( ! empty( $update_plugins->response ) ) {
 704              $counts['plugins'] = count( $update_plugins->response );
 705          }
 706      }
 707  
 708      $themes = current_user_can( 'update_themes' );
 709  
 710      if ( $themes ) {
 711          $update_themes = get_site_transient( 'update_themes' );
 712  
 713          if ( ! empty( $update_themes->response ) ) {
 714              $counts['themes'] = count( $update_themes->response );
 715          }
 716      }
 717  
 718      $core = current_user_can( 'update_core' );
 719  
 720      if ( $core && function_exists( 'get_core_updates' ) ) {
 721          $update_wordpress = get_core_updates( array( 'dismissed' => false ) );
 722  
 723          if ( ! empty( $update_wordpress )
 724              && ! in_array( $update_wordpress[0]->response, array( 'development', 'latest' ), true )
 725              && current_user_can( 'update_core' )
 726          ) {
 727              $counts['wordpress'] = 1;
 728          }
 729      }
 730  
 731      if ( ( $core || $plugins || $themes ) && wp_get_translation_updates() ) {
 732          $counts['translations'] = 1;
 733      }
 734  
 735      $counts['total'] = $counts['plugins'] + $counts['themes'] + $counts['wordpress'] + $counts['translations'];
 736      $titles          = array();
 737  
 738      if ( $counts['wordpress'] ) {
 739          /* translators: %d: Number of available WordPress updates. */
 740          $titles['wordpress'] = sprintf( __( '%d WordPress Update' ), $counts['wordpress'] );
 741      }
 742  
 743      if ( $counts['plugins'] ) {
 744          /* translators: %d: Number of available plugin updates. */
 745          $titles['plugins'] = sprintf( _n( '%d Plugin Update', '%d Plugin Updates', $counts['plugins'] ), $counts['plugins'] );
 746      }
 747  
 748      if ( $counts['themes'] ) {
 749          /* translators: %d: Number of available theme updates. */
 750          $titles['themes'] = sprintf( _n( '%d Theme Update', '%d Theme Updates', $counts['themes'] ), $counts['themes'] );
 751      }
 752  
 753      if ( $counts['translations'] ) {
 754          $titles['translations'] = __( 'Translation Updates' );
 755      }
 756  
 757      $update_title = $titles ? esc_attr( implode( ', ', $titles ) ) : '';
 758  
 759      $update_data = array(
 760          'counts' => $counts,
 761          'title'  => $update_title,
 762      );
 763      /**
 764       * Filters the returned array of update data for plugins, themes, and WordPress core.
 765       *
 766       * @since 3.5.0
 767       *
 768       * @param array $update_data {
 769       *     Fetched update data.
 770       *
 771       *     @type array   $counts       An array of counts for available plugin, theme, and WordPress updates.
 772       *     @type string  $update_title Titles of available updates.
 773       * }
 774       * @param array $titles An array of update counts and UI strings for available updates.
 775       */
 776      return apply_filters( 'wp_get_update_data', $update_data, $titles );
 777  }
 778  
 779  /**
 780   * Determines whether core should be updated.
 781   *
 782   * @since 2.8.0
 783   *
 784   * @global string $wp_version The WordPress version string.
 785   */
 786  function _maybe_update_core() {
 787      // Include an unmodified $wp_version.
 788      require  ABSPATH . WPINC . '/version.php';
 789  
 790      $current = get_site_transient( 'update_core' );
 791  
 792      if ( isset( $current->last_checked, $current->version_checked )
 793          && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
 794          && $current->version_checked === $wp_version
 795      ) {
 796          return;
 797      }
 798  
 799      wp_version_check();
 800  }
 801  /**
 802   * Check the last time plugins were run before checking plugin versions.
 803   *
 804   * This might have been backported to WordPress 2.6.1 for performance reasons.
 805   * This is used for the wp-admin to check only so often instead of every page
 806   * load.
 807   *
 808   * @since 2.7.0
 809   * @access private
 810   */
 811  function _maybe_update_plugins() {
 812      $current = get_site_transient( 'update_plugins' );
 813  
 814      if ( isset( $current->last_checked )
 815          && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
 816      ) {
 817          return;
 818      }
 819  
 820      wp_update_plugins();
 821  }
 822  
 823  /**
 824   * Check themes versions only after a duration of time.
 825   *
 826   * This is for performance reasons to make sure that on the theme version
 827   * checker is not run on every page load.
 828   *
 829   * @since 2.7.0
 830   * @access private
 831   */
 832  function _maybe_update_themes() {
 833      $current = get_site_transient( 'update_themes' );
 834  
 835      if ( isset( $current->last_checked )
 836          && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
 837      ) {
 838          return;
 839      }
 840  
 841      wp_update_themes();
 842  }
 843  
 844  /**
 845   * Schedule core, theme, and plugin update checks.
 846   *
 847   * @since 3.1.0
 848   */
 849  function wp_schedule_update_checks() {
 850      if ( ! wp_next_scheduled( 'wp_version_check' ) && ! wp_installing() ) {
 851          wp_schedule_event( time(), 'twicedaily', 'wp_version_check' );
 852      }
 853  
 854      if ( ! wp_next_scheduled( 'wp_update_plugins' ) && ! wp_installing() ) {
 855          wp_schedule_event( time(), 'twicedaily', 'wp_update_plugins' );
 856      }
 857  
 858      if ( ! wp_next_scheduled( 'wp_update_themes' ) && ! wp_installing() ) {
 859          wp_schedule_event( time(), 'twicedaily', 'wp_update_themes' );
 860      }
 861  }
 862  
 863  /**
 864   * Clear existing update caches for plugins, themes, and core.
 865   *
 866   * @since 4.1.0
 867   */
 868  function wp_clean_update_cache() {
 869      if ( function_exists( 'wp_clean_plugins_cache' ) ) {
 870          wp_clean_plugins_cache();
 871      } else {
 872          delete_site_transient( 'update_plugins' );
 873      }
 874  
 875      wp_clean_themes_cache();
 876  
 877      delete_site_transient( 'update_core' );
 878  }
 879  
 880  if ( ( ! is_main_site() && ! is_network_admin() ) || wp_doing_ajax() ) {
 881      return;
 882  }
 883  
 884  add_action( 'admin_init', '_maybe_update_core' );
 885  add_action( 'wp_version_check', 'wp_version_check' );
 886  
 887  add_action( 'load-plugins.php', 'wp_update_plugins' );
 888  add_action( 'load-update.php', 'wp_update_plugins' );
 889  add_action( 'load-update-core.php', 'wp_update_plugins' );
 890  add_action( 'admin_init', '_maybe_update_plugins' );
 891  add_action( 'wp_update_plugins', 'wp_update_plugins' );
 892  
 893  add_action( 'load-themes.php', 'wp_update_themes' );
 894  add_action( 'load-update.php', 'wp_update_themes' );
 895  add_action( 'load-update-core.php', 'wp_update_themes' );
 896  add_action( 'admin_init', '_maybe_update_themes' );
 897  add_action( 'wp_update_themes', 'wp_update_themes' );
 898  
 899  add_action( 'update_option_WPLANG', 'wp_clean_update_cache', 10, 0 );
 900  
 901  add_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' );
 902  
 903  add_action( 'init', 'wp_schedule_update_checks' );


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