wp/wp-includes/ms-blogs.php
changeset 7 cf61fcea0001
parent 5 5e2f62d02dcd
child 9 177826044cd9
--- a/wp/wp-includes/ms-blogs.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-includes/ms-blogs.php	Mon Oct 14 17:39:30 2019 +0200
@@ -5,45 +5,53 @@
  *
  * @package WordPress
  * @subpackage Multisite
- * @since MU
+ * @since MU (3.0.0)
  */
 
 /**
- * Update the last_updated field for the current blog.
+ * Update the last_updated field for the current site.
  *
- * @since MU
+ * @since MU (3.0.0)
  */
 function wpmu_update_blogs_date() {
-	global $wpdb;
+	$site_id = get_current_blog_id();
 
-	update_blog_details( $wpdb->blogid, array('last_updated' => current_time('mysql', true)) );
+	update_blog_details( $site_id, array( 'last_updated' => current_time( 'mysql', true ) ) );
 	/**
 	 * Fires after the blog details are updated.
 	 *
-	 * @since MU
+	 * @since MU (3.0.0)
 	 *
-	 * @param int $blog_id Blog ID.
+	 * @param int $blog_id Site ID.
 	 */
-	do_action( 'wpmu_blog_updated', $wpdb->blogid );
+	do_action( 'wpmu_blog_updated', $site_id );
 }
 
 /**
  * Get a full blog URL, given a blog id.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
  * @param int $blog_id Blog ID
  * @return string Full URL of the blog if found. Empty string if not.
  */
 function get_blogaddress_by_id( $blog_id ) {
-	$bloginfo = get_blog_details( (int) $blog_id, false ); // only get bare details!
-	return ( $bloginfo ) ? esc_url( 'http://' . $bloginfo->domain . $bloginfo->path ) : '';
+	$bloginfo = get_site( (int) $blog_id );
+
+	if ( empty( $bloginfo ) ) {
+		return '';
+	}
+
+	$scheme = parse_url( $bloginfo->home, PHP_URL_SCHEME );
+	$scheme = empty( $scheme ) ? 'http' : $scheme;
+
+	return esc_url( $scheme . '://' . $bloginfo->domain . $bloginfo->path );
 }
 
 /**
  * Get a full blog URL, given a blog name.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
  * @param string $blogname The (subdomain or directory) name
  * @return string
@@ -62,44 +70,52 @@
 }
 
 /**
- * Given a blog's (subdomain or directory) slug, retrieve its id.
+ * Retrieves a sites ID given its (subdomain or directory) slug.
  *
- * @since MU
+ * @since MU (3.0.0)
+ * @since 4.7.0 Converted to use get_sites().
  *
- * @param string $slug
- * @return int A blog id
+ * @param string $slug A site's slug.
+ * @return int|null The site ID, or null if no site is found for the given slug.
  */
 function get_id_from_blogname( $slug ) {
-	global $wpdb;
-
-	$current_site = get_current_site();
+	$current_network = get_network();
 	$slug = trim( $slug, '/' );
 
-	$blog_id = wp_cache_get( 'get_id_from_blogname_' . $slug, 'blog-details' );
-	if ( $blog_id )
-		return $blog_id;
-
 	if ( is_subdomain_install() ) {
-		$domain = $slug . '.' . $current_site->domain;
-		$path = $current_site->path;
+		$domain = $slug . '.' . preg_replace( '|^www\.|', '', $current_network->domain );
+		$path = $current_network->path;
 	} else {
-		$domain = $current_site->domain;
-		$path = $current_site->path . $slug . '/';
+		$domain = $current_network->domain;
+		$path = $current_network->path . $slug . '/';
 	}
 
-	$blog_id = $wpdb->get_var( $wpdb->prepare("SELECT blog_id FROM {$wpdb->blogs} WHERE domain = %s AND path = %s", $domain, $path) );
-	wp_cache_set( 'get_id_from_blogname_' . $slug, $blog_id, 'blog-details' );
-	return $blog_id;
+	$site_ids = get_sites( array(
+		'number' => 1,
+		'fields' => 'ids',
+		'domain' => $domain,
+		'path' => $path,
+	) );
+
+	if ( empty( $site_ids ) ) {
+		return null;
+	}
+
+	return array_shift( $site_ids );
 }
 
 /**
  * Retrieve the details for a blog from the blogs table and blog options.
  *
- * @since MU
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @param int|string|array $fields A blog ID, a blog slug, or an array of fields to query against. Optional. If not specified the current blog ID is used.
- * @param bool $get_all Whether to retrieve all details or only the details in the blogs table. Default is true.
- * @return object|false Blog details on success. False on failure.
+ * @param int|string|array $fields  Optional. A blog ID, a blog slug, or an array of fields to query against.
+ *                                  If not specified the current blog ID is used.
+ * @param bool             $get_all Whether to retrieve all details or only the details in the blogs table.
+ *                                  Default is true.
+ * @return WP_Site|false Blog details on success. False on failure.
  */
 function get_blog_details( $fields = null, $get_all = true ) {
 	global $wpdb;
@@ -194,7 +210,7 @@
 	}
 
 	if ( empty($details) ) {
-		$details = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE blog_id = %d /* get_blog_details */", $blog_id ) );
+		$details = WP_Site::get_instance( $blog_id );
 		if ( ! $details ) {
 			// Set the full cache.
 			wp_cache_set( $blog_id, -1, 'blog-details' );
@@ -202,25 +218,31 @@
 		}
 	}
 
+	if ( ! $details instanceof WP_Site ) {
+		$details = new WP_Site( $details );
+	}
+
 	if ( ! $get_all ) {
 		wp_cache_set( $blog_id . $all, $details, 'blog-details' );
 		return $details;
 	}
 
 	switch_to_blog( $blog_id );
-	$details->blogname		= get_option( 'blogname' );
-	$details->siteurl		= get_option( 'siteurl' );
-	$details->post_count	= get_option( 'post_count' );
+	$details->blogname   = get_option( 'blogname' );
+	$details->siteurl    = get_option( 'siteurl' );
+	$details->post_count = get_option( 'post_count' );
+	$details->home       = get_option( 'home' );
 	restore_current_blog();
 
 	/**
-	 * Filter a blog's details.
+	 * Filters a blog's details.
 	 *
-	 * @since MU
+	 * @since MU (3.0.0)
+	 * @deprecated 4.7.0 Use site_details
 	 *
 	 * @param object $details The blog details.
 	 */
-	$details = apply_filters( 'blog_details', $details );
+	$details = apply_filters_deprecated( 'blog_details', array( $details ), '4.7.0', 'site_details' );
 
 	wp_cache_set( $blog_id . $all, $details, 'blog-details' );
 
@@ -233,7 +255,7 @@
 /**
  * Clear the blog details cache.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
  * @param int $blog_id Optional. Blog ID. Defaults to current blog.
  */
@@ -243,36 +265,17 @@
 		$blog_id = get_current_blog_id();
 	}
 
-	$details = get_blog_details( $blog_id, false );
-	if ( ! $details ) {
-		// Make sure clean_blog_cache() gets the blog ID
-		// when the blog has been previously cached as
-		// non-existent.
-		$details = (object) array(
-			'blog_id' => $blog_id,
-			'domain' => null,
-			'path' => null
-		);
-	}
-
-	clean_blog_cache( $details );
-
-	/**
-	 * Fires after the blog details cache is cleared.
-	 *
-	 * @since 3.4.0
-	 *
-	 * @param int $blog_id Blog ID.
-	 */
-	do_action( 'refresh_blog_details', $blog_id );
+	clean_blog_cache( $blog_id );
 }
 
 /**
  * Update the details for a blog. Updates the blogs table for a given blog id.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $blog_id Blog ID
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int   $blog_id Blog ID
  * @param array $details Array of details keyed by blogs table field names.
  * @return bool True if update succeeds, false otherwise.
  */
@@ -285,7 +288,7 @@
 	if ( is_object($details) )
 		$details = get_object_vars($details);
 
-	$current_details = get_blog_details($blog_id, false);
+	$current_details = get_site( $blog_id );
 	if ( empty($current_details) )
 		return false;
 
@@ -313,18 +316,18 @@
 	if ( $details['spam'] != $current_details['spam'] ) {
 		if ( $details['spam'] == 1 ) {
 			/**
-			 * Fires when the blog status is changed to 'spam'.
+			 * Fires when the 'spam' status is added to a blog.
 			 *
-			 * @since MU
+			 * @since MU (3.0.0)
 			 *
 			 * @param int $blog_id Blog ID.
 			 */
 			do_action( 'make_spam_blog', $blog_id );
 		} else {
 			/**
-			 * Fires when the blog status is changed to 'ham'.
+			 * Fires when the 'spam' status is removed from a blog.
 			 *
-			 * @since MU
+			 * @since MU (3.0.0)
 			 *
 			 * @param int $blog_id Blog ID.
 			 */
@@ -336,7 +339,7 @@
 	if ( $details['mature'] != $current_details['mature'] ) {
 		if ( $details['mature'] == 1 ) {
 			/**
-			 * Fires when the blog status is changed to 'mature'.
+			 * Fires when the 'mature' status is added to a blog.
 			 *
 			 * @since 3.1.0
 			 *
@@ -345,7 +348,7 @@
 			do_action( 'mature_blog', $blog_id );
 		} else {
 			/**
-			 * Fires when the blog status is changed to 'unmature'.
+			 * Fires when the 'mature' status is removed from a blog.
 			 *
 			 * @since 3.1.0
 			 *
@@ -359,18 +362,18 @@
 	if ( $details['archived'] != $current_details['archived'] ) {
 		if ( $details['archived'] == 1 ) {
 			/**
-			 * Fires when the blog status is changed to 'archived'.
+			 * Fires when the 'archived' status is added to a blog.
 			 *
-			 * @since MU
+			 * @since MU (3.0.0)
 			 *
 			 * @param int $blog_id Blog ID.
 			 */
 			do_action( 'archive_blog', $blog_id );
 		} else {
 			/**
-			 * Fires when the blog status is changed to 'unarchived'.
+			 * Fires when the 'archived' status is removed from a blog.
 			 *
-			 * @since MU
+			 * @since MU (3.0.0)
 			 *
 			 * @param int $blog_id Blog ID.
 			 */
@@ -382,7 +385,7 @@
 	if ( $details['deleted'] != $current_details['deleted'] ) {
 		if ( $details['deleted'] == 1 ) {
 			/**
-			 * Fires when the blog status is changed to 'deleted'.
+			 * Fires when the 'deleted' status is added to a blog.
 			 *
 			 * @since 3.5.0
 			 *
@@ -391,7 +394,7 @@
 			do_action( 'make_delete_blog', $blog_id );
 		} else {
 			/**
-			 * Fires when the blog status is changed to 'undeleted'.
+			 * Fires when the 'deleted' status is removed from a blog.
 			 *
 			 * @since 3.5.0
 			 *
@@ -407,7 +410,7 @@
 		restore_current_blog();
 	}
 
-	refresh_blog_details($blog_id);
+	clean_blog_cache( $blog_id );
 
 	return true;
 }
@@ -417,19 +420,229 @@
  *
  * @since 3.5.0
  *
- * @param stdClass $blog The blog details as returned from get_blog_details()
+ * @global bool $_wp_suspend_cache_invalidation
+ *
+ * @param WP_Site|int $blog The site object or ID to be cleared from cache.
  */
 function clean_blog_cache( $blog ) {
+	global $_wp_suspend_cache_invalidation;
+
+	if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
+		return;
+	}
+
+	if ( empty( $blog ) ) {
+		return;
+	}
+
+	$blog_id = $blog;
+	$blog = get_site( $blog_id );
+	if ( ! $blog ) {
+		if ( ! is_numeric( $blog_id ) ) {
+			return;
+		}
+
+		// Make sure a WP_Site object exists even when the site has been deleted.
+		$blog = new WP_Site( (object) array(
+			'blog_id' => $blog_id,
+			'domain'  => null,
+			'path'    => null,
+		) );
+	}
+
 	$blog_id = $blog->blog_id;
 	$domain_path_key = md5( $blog->domain . $blog->path );
 
-	wp_cache_delete( $blog_id , 'blog-details' );
+	wp_cache_delete( $blog_id, 'sites' );
+	wp_cache_delete( $blog_id, 'site-details' );
+	wp_cache_delete( $blog_id, 'blog-details' );
 	wp_cache_delete( $blog_id . 'short' , 'blog-details' );
-	wp_cache_delete(  $domain_path_key, 'blog-lookup' );
+	wp_cache_delete( $domain_path_key, 'blog-lookup' );
+	wp_cache_delete( $domain_path_key, 'blog-id-cache' );
 	wp_cache_delete( 'current_blog_' . $blog->domain, 'site-options' );
 	wp_cache_delete( 'current_blog_' . $blog->domain . $blog->path, 'site-options' );
-	wp_cache_delete( 'get_id_from_blogname_' . trim( $blog->path, '/' ), 'blog-details' );
-	wp_cache_delete( $domain_path_key, 'blog-id-cache' );
+
+	/**
+	 * 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' );
+
+	/**
+	 * Fires after the blog details cache is cleared.
+	 *
+	 * @since 3.4.0
+	 * @deprecated 4.9.0 Use clean_site_cache
+	 *
+	 * @param int $blog_id Blog ID.
+	 */
+	do_action_deprecated( 'refresh_blog_details', array( $blog_id ), '4.9.0', 'clean_site_cache' );
+}
+
+/**
+ * Cleans the site details cache for a site.
+ *
+ * @since 4.7.4
+ *
+ * @param int $site_id Optional. Site ID. Default is the current site ID.
+ */
+function clean_site_details_cache( $site_id = 0 ) {
+	$site_id = (int) $site_id;
+	if ( ! $site_id ) {
+		$site_id = get_current_blog_id();
+	}
+
+	wp_cache_delete( $site_id, 'site-details' );
+	wp_cache_delete( $site_id, 'blog-details' );
+}
+
+/**
+ * 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
+ * @since 4.8.0 Introduced the 'lang_id', 'lang__in', and 'lang__not_in' parameters.
+ *
+ * @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' (returns an array of site IDs)
+ *                                           or empty (returns an array of complete site objects). 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 100.
+ *     @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. If 0,
+ *                                           include all networks. Default 0.
+ *     @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 int          $lang_id           Limit results to a language ID. Default empty.
+ *     @type array        $lang__in          Array of language IDs to include affiliated sites for. Default empty.
+ *     @type array        $lang__not_in      Array of language IDs to exclude affiliated sites for. Default empty.
+ *     @type string       $search            Search term(s) to retrieve matching sites for. Default empty.
+ *     @type array        $search_columns    Array of column names to be searched. Accepts 'domain' and 'path'.
+ *                                           Default empty array.
+ *     @type bool         $update_site_cache Whether to prime the cache for found sites. Default true.
+ * }
+ * @return array|int List of WP_Site objects, a list of site ids when 'fields' is set to 'ids',
+ *                   or the number of sites when 'count' is passed as a query var.
+ */
+function get_sites( $args = array() ) {
+	$query = new WP_Site_Query();
+
+	return $query->query( $args );
 }
 
 /**
@@ -442,11 +655,11 @@
  *
  * If the option was serialized then it will be unserialized when it is returned.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $id A blog ID. Can be null to refer to the current blog.
- * @param string $option Name of option to retrieve. Expected to not be SQL-escaped.
- * @param mixed $default Optional. Default value to return if the option does not exist.
+ * @param int    $id      A blog ID. Can be null to refer to the current blog.
+ * @param string $option  Name of option to retrieve. Expected to not be SQL-escaped.
+ * @param mixed  $default Optional. Default value to return if the option does not exist.
  * @return mixed Value set for the option.
  */
 function get_blog_option( $id, $option, $default = false ) {
@@ -463,7 +676,7 @@
 	restore_current_blog();
 
 	/**
-	 * Filter a blog option value.
+	 * Filters a blog option value.
 	 *
 	 * The dynamic portion of the hook name, `$option`, refers to the blog option name.
 	 *
@@ -487,11 +700,11 @@
  * aren't adding a protected WordPress option. Care should be taken to not name
  * options the same as the ones which are protected.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $id A blog ID. Can be null to refer to the current blog.
+ * @param int    $id     A blog ID. Can be null to refer to the current blog.
  * @param string $option Name of option to add. Expected to not be SQL-escaped.
- * @param mixed $value Optional. Option value, can be anything. Expected to not be SQL-escaped.
+ * @param mixed  $value  Optional. Option value, can be anything. Expected to not be SQL-escaped.
  * @return bool False if option was not added and true if option was added.
  */
 function add_blog_option( $id, $option, $value ) {
@@ -513,9 +726,9 @@
 /**
  * Removes option by name for a given blog id. Prevents removal of protected WordPress options.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $id A blog ID. Can be null to refer to the current blog.
+ * @param int    $id     A blog ID. Can be null to refer to the current blog.
  * @param string $option Name of option to remove. Expected to not be SQL-escaped.
  * @return bool True, if option is successfully deleted. False on failure.
  */
@@ -538,18 +751,19 @@
 /**
  * Update an option for a particular blog.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $id The blog id
- * @param string $option The option key
- * @param mixed $value The option value
+ * @param int    $id         The blog id.
+ * @param string $option     The option key.
+ * @param mixed  $value      The option value.
+ * @param mixed  $deprecated Not used.
  * @return bool True on success, false on failure.
  */
 function update_blog_option( $id, $option, $value, $deprecated = null ) {
 	$id = (int) $id;
 
 	if ( null !== $deprecated  )
-		_deprecated_argument( __FUNCTION__, '3.1' );
+		_deprecated_argument( __FUNCTION__, '3.1.0' );
 
 	if ( get_current_blog_id() == $id )
 		return update_option( $option, $value );
@@ -558,8 +772,6 @@
 	$return = update_option( $option, $value );
 	restore_current_blog();
 
-	refresh_blog_details( $id );
-
 	return $return;
 }
 
@@ -570,34 +782,42 @@
  * from other blogs. You can switch back afterwards using restore_current_blog().
  *
  * Things that aren't switched:
- *  - autoloaded options. See #14992
  *  - plugins. See #14941
  *
  * @see restore_current_blog()
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $new_blog The id of the blog you want to switch to. Default: current blog
+ * @global wpdb            $wpdb
+ * @global int             $blog_id
+ * @global array           $_wp_switched_stack
+ * @global bool            $switched
+ * @global string          $table_prefix
+ * @global WP_Object_Cache $wp_object_cache
+ *
+ * @param int  $new_blog   The id of the blog you want to switch to. Default: current blog
  * @param bool $deprecated Deprecated argument
- * @return bool Always returns True.
+ * @return true Always returns True.
  */
 function switch_to_blog( $new_blog, $deprecated = null ) {
-	global $wpdb, $wp_roles;
+	global $wpdb;
 
-	if ( empty( $new_blog ) )
-		$new_blog = $GLOBALS['blog_id'];
+	$blog_id = get_current_blog_id();
+	if ( empty( $new_blog ) ) {
+		$new_blog = $blog_id;
+	}
 
-	$GLOBALS['_wp_switched_stack'][] = $GLOBALS['blog_id'];
+	$GLOBALS['_wp_switched_stack'][] = $blog_id;
 
 	/*
 	 * If we're switching to the same blog id that we're on,
 	 * set the right vars, do the associated actions, but skip
 	 * the extra unnecessary work
 	 */
-	if ( $new_blog == $GLOBALS['blog_id'] ) {
+	if ( $new_blog == $blog_id ) {
 		/**
 		 * Fires when the blog is switched.
 		 *
-		 * @since MU
+		 * @since MU (3.0.0)
 		 *
 		 * @param int $new_blog New blog ID.
 		 * @param int $new_blog Blog ID.
@@ -609,7 +829,7 @@
 
 	$wpdb->set_blog_id( $new_blog );
 	$GLOBALS['table_prefix'] = $wpdb->get_blog_prefix();
-	$prev_blog_id = $GLOBALS['blog_id'];
+	$prev_blog_id = $blog_id;
 	$GLOBALS['blog_id'] = $new_blog;
 
 	if ( function_exists( 'wp_cache_switch_to_blog' ) ) {
@@ -617,29 +837,23 @@
 	} else {
 		global $wp_object_cache;
 
-		if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) )
+		if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) ) {
 			$global_groups = $wp_object_cache->global_groups;
-		else
+		} else {
 			$global_groups = false;
-
+		}
 		wp_cache_init();
 
 		if ( function_exists( 'wp_cache_add_global_groups' ) ) {
 			if ( is_array( $global_groups ) ) {
 				wp_cache_add_global_groups( $global_groups );
 			} else {
-				wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache' ) );
+				wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites', 'site-details' ) );
 			}
-			wp_cache_add_non_persistent_groups( array( 'comment', 'counts', 'plugins' ) );
+			wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) );
 		}
 	}
 
-	if ( did_action( 'init' ) ) {
-		$wp_roles->reinit();
-		$current_user = wp_get_current_user();
-		$current_user->for_blog( $new_blog );
-	}
-
 	/** This filter is documented in wp-includes/ms-blogs.php */
 	do_action( 'switch_blog', $new_blog, $prev_blog_id );
 	$GLOBALS['switched'] = true;
@@ -651,19 +865,28 @@
  * Restore the current blog, after calling switch_to_blog()
  *
  * @see switch_to_blog()
- * @since MU
+ * @since MU (3.0.0)
+ *
+ * @global wpdb            $wpdb
+ * @global array           $_wp_switched_stack
+ * @global int             $blog_id
+ * @global bool            $switched
+ * @global string          $table_prefix
+ * @global WP_Object_Cache $wp_object_cache
  *
  * @return bool True on success, false if we're already on the current blog
  */
 function restore_current_blog() {
-	global $wpdb, $wp_roles;
+	global $wpdb;
 
-	if ( empty( $GLOBALS['_wp_switched_stack'] ) )
+	if ( empty( $GLOBALS['_wp_switched_stack'] ) ) {
 		return false;
+	}
 
 	$blog = array_pop( $GLOBALS['_wp_switched_stack'] );
+	$blog_id = get_current_blog_id();
 
-	if ( $GLOBALS['blog_id'] == $blog ) {
+	if ( $blog_id == $blog ) {
 		/** This filter is documented in wp-includes/ms-blogs.php */
 		do_action( 'switch_blog', $blog, $blog );
 		// If we still have items in the switched stack, consider ourselves still 'switched'
@@ -672,7 +895,7 @@
 	}
 
 	$wpdb->set_blog_id( $blog );
-	$prev_blog_id = $GLOBALS['blog_id'];
+	$prev_blog_id = $blog_id;
 	$GLOBALS['blog_id'] = $blog;
 	$GLOBALS['table_prefix'] = $wpdb->get_blog_prefix();
 
@@ -681,10 +904,11 @@
 	} else {
 		global $wp_object_cache;
 
-		if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) )
+		if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) ) {
 			$global_groups = $wp_object_cache->global_groups;
-		else
+		} else {
 			$global_groups = false;
+		}
 
 		wp_cache_init();
 
@@ -692,18 +916,12 @@
 			if ( is_array( $global_groups ) ) {
 				wp_cache_add_global_groups( $global_groups );
 			} else {
-				wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache' ) );
+				wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites', 'site-details' ) );
 			}
-			wp_cache_add_non_persistent_groups( array( 'comment', 'counts', 'plugins' ) );
+			wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) );
 		}
 	}
 
-	if ( did_action( 'init' ) ) {
-		$wp_roles->reinit();
-		$current_user = wp_get_current_user();
-		$current_user->for_blog( $blog );
-	}
-
 	/** This filter is documented in wp-includes/ms-blogs.php */
 	do_action( 'switch_blog', $blog, $prev_blog_id );
 
@@ -714,10 +932,33 @@
 }
 
 /**
+ * Switches the initialized roles and current user capabilities to another site.
+ *
+ * @since 4.9.0
+ *
+ * @param int $new_site_id New site ID.
+ * @param int $old_site_id Old site ID.
+ */
+function wp_switch_roles_and_user( $new_site_id, $old_site_id ) {
+	if ( $new_site_id == $old_site_id ) {
+		return;
+	}
+
+	if ( ! did_action( 'init' ) ) {
+		return;
+	}
+
+	wp_roles()->for_site( $new_site_id );
+	wp_get_current_user()->for_site( $new_site_id );
+}
+
+/**
  * Determines if switch_to_blog() is in effect
  *
  * @since 3.5.0
  *
+ * @global array $_wp_switched_stack
+ *
  * @return bool True if switched, false otherwise.
  */
 function ms_is_switched() {
@@ -727,7 +968,7 @@
 /**
  * Check if a particular blog is archived.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
  * @param int $id The blog id
  * @return string Whether the blog is archived or not
@@ -739,9 +980,9 @@
 /**
  * Update the 'archived' status of a particular blog.
  *
- * @since MU
+ * @since MU (3.0.0)
  *
- * @param int $id The blog id
+ * @param int    $id       The blog id
  * @param string $archived The new status
  * @return string $archived
  */
@@ -753,18 +994,21 @@
 /**
  * Update a blog details field.
  *
- * @since MU
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @param int $blog_id BLog ID
- * @param string $pref A field name
- * @param string $value Value for $pref
- * @return string $value
+ * @param int    $blog_id BLog ID
+ * @param string $pref    A field name
+ * @param string $value   Value for $pref
+ * @param null   $deprecated
+ * @return string|false $value
  */
 function update_blog_status( $blog_id, $pref, $value, $deprecated = null ) {
 	global $wpdb;
 
 	if ( null !== $deprecated  )
-		_deprecated_argument( __FUNCTION__, '3.1' );
+		_deprecated_argument( __FUNCTION__, '3.1.0' );
 
 	if ( ! in_array( $pref, array( 'site_id', 'domain', 'path', 'registered', 'last_updated', 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id') ) )
 		return $value;
@@ -774,7 +1018,7 @@
 	if ( false === $result )
 		return false;
 
-	refresh_blog_details( $blog_id );
+	clean_blog_cache( $blog_id );
 
 	if ( 'spam' == $pref ) {
 		if ( $value == 1 ) {
@@ -812,7 +1056,7 @@
 		/**
 		 * Fires after the current blog's 'public' setting is updated.
 		 *
-		 * @since MU
+		 * @since MU (3.0.0)
 		 *
 		 * @param int    $blog_id Blog ID.
 		 * @param string $value   The value of blog status.
@@ -826,16 +1070,18 @@
 /**
  * Get a blog details field.
  *
- * @since MU
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @param int $id The blog id
+ * @param int    $id   The blog id
  * @param string $pref A field name
- * @return bool $value
+ * @return bool|string|null $value
  */
 function get_blog_status( $id, $pref ) {
 	global $wpdb;
 
-	$details = get_blog_details( $id, false );
+	$details = get_site( $id );
 	if ( $details )
 		return $details->$pref;
 
@@ -845,11 +1091,13 @@
 /**
  * Get a list of most recently updated blogs.
  *
- * @since MU
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @param mixed $deprecated Not used
- * @param int $start The offset
- * @param int $quantity The maximum number of blogs to retrieve. Default is 40.
+ * @param int   $start      The offset
+ * @param int   $quantity   The maximum number of blogs to retrieve. Default is 40.
  * @return array The list of blogs
  */
 function get_last_updated( $deprecated = '', $start = 0, $quantity = 40 ) {
@@ -858,17 +1106,148 @@
 	if ( ! empty( $deprecated ) )
 		_deprecated_argument( __FUNCTION__, 'MU' ); // never used
 
-	return $wpdb->get_results( $wpdb->prepare("SELECT blog_id, domain, path FROM $wpdb->blogs WHERE site_id = %d AND public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0' AND last_updated != '0000-00-00 00:00:00' ORDER BY last_updated DESC limit %d, %d", $wpdb->siteid, $start, $quantity ) , ARRAY_A );
+	return $wpdb->get_results( $wpdb->prepare( "SELECT blog_id, domain, path FROM $wpdb->blogs WHERE site_id = %d AND public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0' AND last_updated != '0000-00-00 00:00:00' ORDER BY last_updated DESC limit %d, %d", get_current_network_id(), $start, $quantity ), ARRAY_A );
+}
+
+/**
+ * Retrieves a list of networks.
+ *
+ * @since 4.6.0
+ *
+ * @param string|array $args Optional. Array or string of arguments. See WP_Network_Query::parse_query()
+ *                           for information on accepted arguments. Default empty array.
+ * @return array|int List of WP_Network objects, a list of network ids when 'fields' is set to 'ids',
+ *                   or the number of networks when 'count' is passed as a query var.
+ */
+function get_networks( $args = array() ) {
+	$query = new WP_Network_Query();
+
+	return $query->query( $args );
+}
+
+/**
+ * Retrieves network data given a network ID or network object.
+ *
+ * Network data will be cached and returned after being passed through a filter.
+ * If the provided network is empty, the current network global will be used.
+ *
+ * @since 4.6.0
+ *
+ * @global WP_Network $current_site
+ *
+ * @param WP_Network|int|null $network Optional. Network to retrieve. Default is the current network.
+ * @return WP_Network|null The network object or null if not found.
+ */
+function get_network( $network = null ) {
+	global $current_site;
+	if ( empty( $network ) && isset( $current_site ) ) {
+		$network = $current_site;
+	}
+
+	if ( $network instanceof WP_Network ) {
+		$_network = $network;
+	} elseif ( is_object( $network ) ) {
+		$_network = new WP_Network( $network );
+	} else {
+		$_network = WP_Network::get_instance( $network );
+	}
+
+	if ( ! $_network ) {
+		return null;
+	}
+
+	/**
+	 * Fires after a network is retrieved.
+	 *
+	 * @since 4.6.0
+	 *
+	 * @param WP_Network $_network Network data.
+	 */
+	$_network = apply_filters( 'get_network', $_network );
+
+	return $_network;
 }
 
 /**
- * Handler for updating the blog date when a post is published or an already published post is changed.
+ * Removes a network from the object cache.
+ *
+ * @since 4.6.0
+ *
+ * @global bool $_wp_suspend_cache_invalidation
+ *
+ * @param int|array $ids Network ID or an array of network IDs to remove from cache.
+ */
+function clean_network_cache( $ids ) {
+	global $_wp_suspend_cache_invalidation;
+
+	if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
+		return;
+	}
+
+	foreach ( (array) $ids as $id ) {
+		wp_cache_delete( $id, 'networks' );
+
+		/**
+		 * Fires immediately after a network has been removed from the object cache.
+		 *
+		 * @since 4.6.0
+		 *
+		 * @param int $id Network ID.
+		 */
+		do_action( 'clean_network_cache', $id );
+	}
+
+	wp_cache_set( 'last_changed', microtime(), 'networks' );
+}
+
+/**
+ * Updates the network cache of given networks.
+ *
+ * Will add the networks in $networks to the cache. If network ID already exists
+ * in the network cache then it will not be updated. The network is added to the
+ * cache using the network group with the key using the ID of the networks.
+ *
+ * @since 4.6.0
+ *
+ * @param array $networks Array of network row objects.
+ */
+function update_network_cache( $networks ) {
+	foreach ( (array) $networks as $network ) {
+		wp_cache_add( $network->id, $network, 'networks' );
+	}
+}
+
+/**
+ * Adds any networks from the given IDs to the cache that do not already exist in cache.
+ *
+ * @since 4.6.0
+ * @access private
+ *
+ * @see update_network_cache()
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $network_ids Array of network IDs.
+ */
+function _prime_network_caches( $network_ids ) {
+	global $wpdb;
+
+	$non_cached_ids = _get_non_cached_ids( $network_ids, 'networks' );
+	if ( !empty( $non_cached_ids ) ) {
+		$fresh_networks = $wpdb->get_results( sprintf( "SELECT $wpdb->site.* FROM $wpdb->site WHERE id IN (%s)", join( ",", array_map( 'intval', $non_cached_ids ) ) ) );
+
+		update_network_cache( $fresh_networks );
+	}
+}
+
+/**
+ * Handler for updating the site's last updated date when a post is published or
+ * an already published post is changed.
  *
  * @since 3.3.0
  *
  * @param string $new_status The new post status
  * @param string $old_status The old post status
- * @param object $post Post object
+ * @param object $post       Post object
  */
 function _update_blog_date_on_post_publish( $new_status, $old_status, $post ) {
 	$post_type_obj = get_post_type_object( $post->post_type );
@@ -886,7 +1265,8 @@
 }
 
 /**
- * Handler for updating the blog date when a published post is deleted.
+ * Handler for updating the current site's last updated date when a published
+ * post is deleted.
  *
  * @since 3.4.0
  *
@@ -908,7 +1288,7 @@
 }
 
 /**
- * Handler for updating the blog posts count date when a post is deleted.
+ * Handler for updating the current site's posts count when a post is deleted.
  *
  * @since 4.0.0
  *
@@ -917,7 +1297,7 @@
 function _update_posts_count_on_delete( $post_id ) {
 	$post = get_post( $post_id );
 
-	if ( ! $post || 'publish' !== $post->post_status ) {
+	if ( ! $post || 'publish' !== $post->post_status || 'post' !== $post->post_type ) {
 		return;
 	}
 
@@ -925,22 +1305,27 @@
 }
 
 /**
- * Handler for updating the blog posts count date when a post status changes.
+ * Handler for updating the current site's posts count when a post status changes.
  *
  * @since 4.0.0
+ * @since 4.9.0 Added the `$post` parameter.
  *
- * @param string $new_status The status the post is changing to.
- * @param string $old_status The status the post is changing from.
+ * @param string  $new_status The status the post is changing to.
+ * @param string  $old_status The status the post is changing from.
+ * @param WP_Post $post       Post object
  */
-function _update_posts_count_on_transition_post_status( $new_status, $old_status ) {
+function _update_posts_count_on_transition_post_status( $new_status, $old_status, $post = null ) {
 	if ( $new_status === $old_status ) {
 		return;
 	}
 
+	if ( 'post' !== get_post_type( $post ) ) {
+		return;
+	}
+
 	if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
 		return;
 	}
 
 	update_posts_count();
 }
-