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   1  <?php
   2  /**
   3   * Network API
   4   *
   5   * @package WordPress
   6   * @subpackage Multisite
   7   * @since 5.1.0
   8   */
   9  
  10  /**
  11   * Retrieves network data given a network ID or network object.
  12   *
  13   * Network data will be cached and returned after being passed through a filter.
  14   * If the provided network is empty, the current network global will be used.
  15   *
  16   * @since 4.6.0
  17   *
  18   * @global WP_Network $current_site
  19   *
  20   * @param WP_Network|int|null $network Optional. Network to retrieve. Default is the current network.
  21   * @return WP_Network|null The network object or null if not found.
  22   */
  23  function get_network( $network = null ) {
  24      global $current_site;
  25      if ( empty( $network ) && isset( $current_site ) ) {
  26          $network = $current_site;
  27      }
  28  
  29      if ( $network instanceof WP_Network ) {
  30          $_network = $network;
  31      } elseif ( is_object( $network ) ) {
  32          $_network = new WP_Network( $network );
  33      } else {
  34          $_network = WP_Network::get_instance( $network );
  35      }
  36  
  37      if ( ! $_network ) {
  38          return null;
  39      }
  40  
  41      /**
  42       * Fires after a network is retrieved.
  43       *
  44       * @since 4.6.0
  45       *
  46       * @param WP_Network $_network Network data.
  47       */
  48      $_network = apply_filters( 'get_network', $_network );
  49  
  50      return $_network;
  51  }
  52  
  53  /**
  54   * Retrieves a list of networks.
  55   *
  56   * @since 4.6.0
  57   *
  58   * @param string|array $args Optional. Array or string of arguments. See WP_Network_Query::parse_query()
  59   *                           for information on accepted arguments. Default empty array.
  60   * @return array|int List of WP_Network objects, a list of network IDs when 'fields' is set to 'ids',
  61   *                   or the number of networks when 'count' is passed as a query var.
  62   */
  63  function get_networks( $args = array() ) {
  64      $query = new WP_Network_Query();
  65  
  66      return $query->query( $args );
  67  }
  68  
  69  /**
  70   * Removes a network from the object cache.
  71   *
  72   * @since 4.6.0
  73   *
  74   * @global bool $_wp_suspend_cache_invalidation
  75   *
  76   * @param int|array $ids Network ID or an array of network IDs to remove from cache.
  77   */
  78  function clean_network_cache( $ids ) {
  79      global $_wp_suspend_cache_invalidation;
  80  
  81      if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
  82          return;
  83      }
  84  
  85      $network_ids = (array) $ids;
  86      wp_cache_delete_multiple( $network_ids, 'networks' );
  87  
  88      foreach ( $network_ids as $id ) {
  89          /**
  90           * Fires immediately after a network has been removed from the object cache.
  91           *
  92           * @since 4.6.0
  93           *
  94           * @param int $id Network ID.
  95           */
  96          do_action( 'clean_network_cache', $id );
  97      }
  98  
  99      wp_cache_set( 'last_changed', microtime(), 'networks' );
 100  }
 101  
 102  /**
 103   * Updates the network cache of given networks.
 104   *
 105   * Will add the networks in $networks to the cache. If network ID already exists
 106   * in the network cache then it will not be updated. The network is added to the
 107   * cache using the network group with the key using the ID of the networks.
 108   *
 109   * @since 4.6.0
 110   *
 111   * @param array $networks Array of network row objects.
 112   */
 113  function update_network_cache( $networks ) {
 114      $data = array();
 115      foreach ( (array) $networks as $network ) {
 116          $data[ $network->id ] = $network;
 117      }
 118      wp_cache_add_multiple( $data, 'networks' );
 119  }
 120  
 121  /**
 122   * Adds any networks from the given IDs to the cache that do not already exist in cache.
 123   *
 124   * @since 4.6.0
 125   * @access private
 126   *
 127   * @see update_network_cache()
 128   * @global wpdb $wpdb WordPress database abstraction object.
 129   *
 130   * @param array $network_ids Array of network IDs.
 131   */
 132  function _prime_network_caches( $network_ids ) {
 133      global $wpdb;
 134  
 135      $non_cached_ids = _get_non_cached_ids( $network_ids, 'networks' );
 136      if ( ! empty( $non_cached_ids ) ) {
 137          $fresh_networks = $wpdb->get_results( sprintf( "SELECT $wpdb->site.* FROM $wpdb->site WHERE id IN (%s)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
 138  
 139          update_network_cache( $fresh_networks );
 140      }
 141  }