+
+ /**
+ * Fires immediately after a site has been removed from the object cache.
+ *
+ * @since 4.6.0
+ *
+ * @param int $id Blog ID.
+ * @param WP_Site $blog Site object.
+ * @param string $domain_path_key md5 hash of domain and path.
+ */
+ do_action( 'clean_site_cache', $blog_id, $blog, $domain_path_key );
+
+ wp_cache_set( 'last_changed', microtime(), 'sites' );
+}
+
+/**
+ * Retrieves site data given a site ID or site object.
+ *
+ * Site data will be cached and returned after being passed through a filter.
+ * If the provided site is empty, the current site global will be used.
+ *
+ * @since 4.6.0
+ *
+ * @param WP_Site|int|null $site Optional. Site to retrieve. Default is the current site.
+ * @return WP_Site|null The site object or null if not found.
+ */
+function get_site( $site = null ) {
+ if ( empty( $site ) ) {
+ $site = get_current_blog_id();
+ }
+
+ if ( $site instanceof WP_Site ) {
+ $_site = $site;
+ } elseif ( is_object( $site ) ) {
+ $_site = new WP_Site( $site );
+ } else {
+ $_site = WP_Site::get_instance( $site );
+ }
+
+ if ( ! $_site ) {
+ return null;
+ }
+
+ /**
+ * Fires after a site is retrieved.
+ *
+ * @since 4.6.0
+ *
+ * @param WP_Site $_site Site data.
+ */
+ $_site = apply_filters( 'get_site', $_site );
+
+ return $_site;
+}
+
+/**
+ * Adds any sites from the given ids to the cache that do not already exist in cache.
+ *
+ * @since 4.6.0
+ * @access private
+ *
+ * @see update_site_cache()
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $ids ID list.
+ */
+function _prime_site_caches( $ids ) {
+ global $wpdb;
+
+ $non_cached_ids = _get_non_cached_ids( $ids, 'sites' );
+ if ( ! empty( $non_cached_ids ) ) {
+ $fresh_sites = $wpdb->get_results( sprintf( "SELECT * FROM $wpdb->blogs WHERE blog_id IN (%s)", join( ",", array_map( 'intval', $non_cached_ids ) ) ) );
+
+ update_site_cache( $fresh_sites );
+ }
+}
+
+/**
+ * Updates sites in cache.
+ *
+ * @since 4.6.0
+ *
+ * @param array $sites Array of site objects.
+ */
+function update_site_cache( $sites ) {
+ if ( ! $sites ) {
+ return;
+ }
+
+ foreach ( $sites as $site ) {
+ wp_cache_add( $site->blog_id, $site, 'sites' );
+ wp_cache_add( $site->blog_id . 'short', $site, 'blog-details' );
+ }
+}
+
+/**
+ * Retrieves a list of sites matching requested arguments.
+ *
+ * @since 4.6.0
+ *
+ * @see WP_Site_Query::parse_query()
+ *
+ * @param string|array $args {
+ * Optional. Array or query string of site query parameters. Default empty.
+ *
+ * @type array $site__in Array of site IDs to include. Default empty.
+ * @type array $site__not_in Array of site IDs to exclude. Default empty.
+ * @type bool $count Whether to return a site count (true) or array of site objects.
+ * Default false.
+ * @type array $date_query Date query clauses to limit sites by. See WP_Date_Query.
+ * Default null.
+ * @type string $fields Site fields to return. Accepts 'ids' for site IDs only or empty
+ * for all fields. Default empty.
+ * @type int $ID A site ID to only return that site. Default empty.
+ * @type int $number Maximum number of sites to retrieve. Default null (no limit).
+ * @type int $offset Number of sites to offset the query. Used to build LIMIT clause.
+ * Default 0.
+ * @type bool $no_found_rows Whether to disable the `SQL_CALC_FOUND_ROWS` query. Default true.
+ * @type string|array $orderby Site status or array of statuses. Accepts 'id', 'domain', 'path',
+ * 'network_id', 'last_updated', 'registered', 'domain_length',
+ * 'path_length', 'site__in' and 'network__in'. Also accepts false,
+ * an empty array, or 'none' to disable `ORDER BY` clause.
+ * Default 'id'.
+ * @type string $order How to order retrieved sites. Accepts 'ASC', 'DESC'. Default 'ASC'.
+ * @type int $network_id Limit results to those affiliated with a given network ID.
+ * Default current network ID.
+ * @type array $network__in Array of network IDs to include affiliated sites for. Default empty.
+ * @type array $network__not_in Array of network IDs to exclude affiliated sites for. Default empty.
+ * @type string $domain Limit results to those affiliated with a given domain.
+ * Default empty.
+ * @type array $domain__in Array of domains to include affiliated sites for. Default empty.
+ * @type array $domain__not_in Array of domains to exclude affiliated sites for. Default empty.
+ * @type string $path Limit results to those affiliated with a given path.
+ * Default empty.
+ * @type array $path__in Array of paths to include affiliated sites for. Default empty.
+ * @type array $path__not_in Array of paths to exclude affiliated sites for. Default empty.
+ * @type int $public Limit results to public sites. Accepts '1' or '0'. Default empty.
+ * @type int $archived Limit results to archived sites. Accepts '1' or '0'. Default empty.
+ * @type int $mature Limit results to mature sites. Accepts '1' or '0'. Default empty.
+ * @type int $spam Limit results to spam sites. Accepts '1' or '0'. Default empty.
+ * @type int $deleted Limit results to deleted sites. Accepts '1' or '0'. Default empty.
+ * @type string $search Search term(s) to retrieve matching sites for. Default empty.
+ * @type bool $update_site_cache Whether to prime the cache for found sites. Default false.
+ * }
+ * @return array List of sites.
+ */
+function get_sites( $args = array() ) {
+ $query = new WP_Site_Query();
+
+ return $query->query( $args );
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