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Description

Executes network-level upgrade routines.

Usage

upgrade_network();

Parameters

Returns

void

Source

File name: wordpress/wp-admin/includes/upgrade.php
Lines:

function upgrade_network() {
  global $wp_current_db_version, $wpdb;

  // Always clear expired transients.
  delete_expired_transients( true );

  // 2.8.0
  if ( $wp_current_db_version < 11549 ) {
    $wpmu_sitewide_plugins   = get_site_option( 'wpmu_sitewide_plugins' );
    $active_sitewide_plugins = get_site_option( 'active_sitewide_plugins' );
    if ( $wpmu_sitewide_plugins ) {
      if ( ! $active_sitewide_plugins ) {
        $sitewide_plugins = (array) $wpmu_sitewide_plugins;
      } else {
        $sitewide_plugins = array_merge( (array) $active_sitewide_plugins, (array) $wpmu_sitewide_plugins );
      }

      update_site_option( 'active_sitewide_plugins', $sitewide_plugins );
    }
    delete_site_option( 'wpmu_sitewide_plugins' );
    delete_site_option( 'deactivated_sitewide_plugins' );

    $start = 0;
    while ( $rows = $wpdb->get_results( "SELECT meta_key, meta_value FROM {$wpdb->sitemeta} ORDER BY meta_id LIMIT $start, 20" ) ) {
      foreach ( $rows as $row ) {
        $value = $row->meta_value;
        if ( ! @unserialize( $value ) ) {
          $value = stripslashes( $value );
        }
        if ( $value !== $row->meta_value ) {
          update_site_option( $row->meta_key, $value );
        }
      }
      $start += 20;
    }
  }

  // 3.0.0
  if ( $wp_current_db_version < 13576 ) {
    update_site_option( 'global_terms_enabled', '1' );
  }

  // 3.3.0
  if ( $wp_current_db_version < 19390 ) {
    update_site_option( 'initial_db_version', $wp_current_db_version );
  }

  if ( $wp_current_db_version < 19470 ) {
    if ( false === get_site_option( 'active_sitewide_plugins' ) ) {
      update_site_option( 'active_sitewide_plugins', array() );
    }
  }

  // 3.4.0
  if ( $wp_current_db_version < 20148 ) {
    // 'allowedthemes' keys things by stylesheet. 'allowed_themes' keyed things by name.
    $allowedthemes  = get_site_option( 'allowedthemes' );
    $allowed_themes = get_site_option( 'allowed_themes' );
    if ( false === $allowedthemes && is_array( $allowed_themes ) && $allowed_themes ) {
      $converted = array();
      $themes    = wp_get_themes();
      foreach ( $themes as $stylesheet => $theme_data ) {
        if ( isset( $allowed_themes[ $theme_data->get( 'Name' ) ] ) ) {
          $converted[ $stylesheet ] = true;
        }
      }
      update_site_option( 'allowedthemes', $converted );
      delete_site_option( 'allowed_themes' );
    }
  }

  // 3.5.0
  if ( $wp_current_db_version < 21823 ) {
    update_site_option( 'ms_files_rewriting', '1' );
  }

  // 3.5.2
  if ( $wp_current_db_version < 24448 ) {
    $illegal_names = get_site_option( 'illegal_names' );
    if ( is_array( $illegal_names ) && count( $illegal_names ) === 1 ) {
      $illegal_name  = reset( $illegal_names );
      $illegal_names = explode( ' ', $illegal_name );
      update_site_option( 'illegal_names', $illegal_names );
    }
  }

  // 4.2.0
  if ( $wp_current_db_version < 31351 && 'utf8mb4' === $wpdb->charset ) {
    if ( wp_should_upgrade_global_tables() ) {
      $wpdb->query( "ALTER TABLE $wpdb->usermeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
      $wpdb->query( "ALTER TABLE $wpdb->site DROP INDEX domain, ADD INDEX domain(domain(140),path(51))" );
      $wpdb->query( "ALTER TABLE $wpdb->sitemeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
      $wpdb->query( "ALTER TABLE $wpdb->signups DROP INDEX domain_path, ADD INDEX domain_path(domain(140),path(51))" );

      $tables = $wpdb->tables( 'global' );

      // sitecategories may not exist.
      if ( ! $wpdb->get_var( "SHOW TABLES LIKE '{$tables['sitecategories']}'" ) ) {
        unset( $tables['sitecategories'] );
      }
 

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