Index: wp-includes/class-wp-site-query.php
===================================================================
--- wp-includes/class-wp-site-query.php	(revision 0)
+++ wp-includes/class-wp-site-query.php	(working copy)
@@ -0,0 +1,696 @@
+<?php
+
+/**
+ * Site API: WP_Site_Query class
+ *
+ * @package WordPress
+ * @subpackage Sites
+ * @since 4.6.0
+ */
+
+/**
+ * Core class used for querying sites.
+ *
+ * @since 4.6.0
+ *
+ * @see WP_Site_Query::__construct() for accepted arguments.
+ */
+class WP_Site_Query {
+
+        /**
+	         * SQL for database query.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var string
+	         */
+        public $request;
+
+        /**
+	         * SQL query clauses.
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         * @var array
+	         */
+        protected $sql_clauses = array(
+		                'select'  => '',
+		                'from'    => '',
+		                'where'   => array(),
+		                'groupby' => '',
+		                'orderby' => '',
+		                'limits'  => '',
+		        );
+
+        /**
+	         * SQL WHERE clause.
+	         *
+	         * Stored after the 'sites_clauses' filter is run on the compiled WHERE sub-clauses.
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         * @var string
+	         */
+        protected $filtered_where_clause;
+
+        /**
+	         * Date query container
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var object WP_Date_Query
+	         */
+        public $date_query = false;
+
+        /**
+	         * Query vars set by the user.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var array
+	         */
+        public $query_vars;
+
+        /**
+	         * Default values for query vars.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var array
+	         */
+        public $query_var_defaults;
+
+        /**
+	         * List of sites located by the query.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var array
+	         */
+        public $sites;
+
+        /**
+	         * The amount of found sites for the current query.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var int
+	         */
+        public $found_sites = 0;
+
+        /**
+	         * The number of pages.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         * @var int
+	         */
+        public $max_num_pages = 0;
+
+        /**
+	         * Make private/protected methods readable for backwards compatibility.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         *
+	         * @param callable $name Method to call.
+	         * @param array $arguments Arguments to pass when calling.
+	         *
+	         * @return mixed|false Return value of the callback, false otherwise.
+	         */
+        public function __call( $name, $arguments ) {
+		                if ( 'get_search_sql' === $name ) {
+			                        return call_user_func_array( array( $this, $name ), $arguments );
+                }
+
+                return false;
+        }
+
+        /**
+	         * Constructor.
+	         *
+	         * Sets up the site query, based on the query vars passed.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         *
+	         * @param string|array $query {
+	         *     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 (false). 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 Currently unused.
+	         * @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 $orderby Site status or array of statuses. To use 'meta_value'
+	         *                                                   or 'meta_value_num', `$meta_key` must also be defined.
+	         *                                                   To sort by a specific `$meta_query` clause, use that
+	         *                                                   clause's array key. Accepts 'site_agent',
+	         *                                                   'site_approved', 'site_author',
+	         *                                                   'site_author_email', 'site_author_IP',
+	         *                                                   'site_author_url', 'site_content', 'site_date',
+	         *                                                   'site_date_gmt', 'blog_id', 'site_karma',
+	         *                                                   'site_parent', 'site_id', 'site_type',
+	         *                                                   'user_id', 'site__in', 'meta_value', 'meta_value_num',
+	         *                                                   the value of $meta_key, and the array keys of
+	         *                                                   `$meta_query`. Also accepts false, an empty array, or
+	         *                                                   'none' to disable `ORDER BY` clause.
+	         *                                                   Default: 'site_date_gmt'.
+	         * @type string $order How to order retrieved sites. Accepts 'ASC', 'DESC'.
+	         *                                                   Default: 'DESC'.
+	         * @type string $domain Limit results to those affiliated with a given network ID.
+	         *                                                   Default current network id.
+	         * @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 network ID.
+	         *                                                   Default current network id.
+	         * @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 $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 $search Search term(s) to retrieve matching sites for.
+	         *                                                   Default empty.
+	         * @type bool $update_site_cache Whether to prime the cache for site networks.
+	         *                                                   Default false.
+	         * }
+	         */
+        public function __construct( $query = '' ) {
+		                $this->query_var_defaults = array(
+			                        'fields'            => '',
+			                        'ID'                => '',
+			                        'site__in'          => '',
+			                        'site__not_in'      => '',
+			                        'number'            => 100,
+			                        'offset'            => '',
+			                        'no_found_rows'     => true,
+			                        'orderby'           => 'ids',
+			                        'order'             => 'DESC',
+			                        'network_id'        => 0,
+			                        'network__in'       => '',
+			                        'network__not_in'   => '',
+			                        'domain'            => '',
+			                        'domain__in'        => '',
+			                        'domain__not_in'    => '',
+			                        'path'              => '',
+			                        'path__in'          => '',
+			                        'path__not_in'      => '',
+			                        'public'            => null,
+			                        'archived'          => null,
+			                        'mature'            => null,
+			                        'spam'              => null,
+			                        'deleted'           => null,
+			                        'search'            => '',
+			                        'count'             => false,
+			                        'date_query'        => null, // See WP_Date_Query
+			                        'update_site_cache' => true,
+			                );
+		
+		                if ( ! empty( $query ) ) {
+			                        $this->query( $query );
+			                }
+        }
+
+        /**
+	         * Parse arguments passed to the site query with default query parameters.
+	         *
+	         * @since  4.6.0 Extracted from WP_Site_Query::query().
+	         *
+	         * @access public
+	         *
+	         * @param string|array $query WP_Site_Query arguments. See WP_Site_Query::__construct()
+	         */
+        public function parse_query( $query = '' ) {
+		                if ( empty( $query ) ) {
+			                        $query = $this->query_vars;
+			                }
+
+                $this->query_vars = wp_parse_args( $query, $this->query_var_defaults );
+                do_action_ref_array( 'parse_site_query', array( &$this ) );
+        }
+
+        /**
+	         * Sets up the WordPress query for retrieving sites.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         *
+	         * @param string|array $query Array or URL query string of parameters.
+	         *
+	         * @return array|int List of sites, or number of sites when 'count' is passed as a query var.
+	         */
+        public function query( $query ) {
+		                $this->query_vars = wp_parse_args( $query );
+		
+		                return $this->get_sites();
+        }
+
+        /**
+	         * Get a list of sites matching the query vars.
+	         *
+	         * @since 4.6.0
+	         * @access public
+	         *
+	         * @global wpdb $wpdb WordPress database abstraction object.
+	         *
+	         * @return int|array The list of sites.
+	         */
+        public function get_sites() {
+		                global $wpdb;
+
+                $this->parse_query();
+
+
+                /**
+                 * Fires before sites are retrieved.
+                 *
+                 * @since 4.6.0
+                 *
+                 * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference.
+                 */
+                do_action_ref_array( 'pre_get_sites', array( &$this ) );
+
+                // $args can include anything. Only use the args defined in the query_var_defaults to compute the key.
+                $key          = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
+                $last_changed = wp_cache_get( 'last_changed', 'site' );
+                if ( ! $last_changed ) {
+			                        $last_changed = microtime();
+			                        wp_cache_set( 'last_changed', $last_changed, 'site' );
+			                }
+                $cache_key = "get_site_ids:$key:$last_changed";
+
+                $site_ids = wp_cache_get( $cache_key, 'site' );
+                if ( false === $site_ids ) {
+			                        $site_ids = $this->get_site_ids();
+			                        wp_cache_add( $cache_key, $site_ids, 'site' );
+			                }
+
+                // If querying for a count only, there's nothing more to do.
+                if ( $this->query_vars['count'] ) {
+			                        // $site_ids is actually a count in this case.
+			                        return intval( $site_ids );
+                }
+
+                $site_ids = array_map( 'intval', $site_ids );
+
+                $this->site_count = count( $this->sites );
+
+                if ( $site_ids && $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
+			                        /**
+			                         * Filter the query used to retrieve found site count.
+			                         *
+			                         * @since 4.6.0
+			                         *
+			                         * @param string $found_sites_query SQL query. Default 'SELECT FOUND_ROWS()'.
+			                         * @param WP_Site_Query $site_query The `WP_Site_Query` instance.
+			                         */
+			                        $found_sites_query = apply_filters( 'found_sites_query', 'SELECT FOUND_ROWS()', $this );
+			                        $this->found_sites = (int) $wpdb->get_var( $found_sites_query );
+			
+			                        $this->max_num_pages = ceil( $this->found_sites / $this->query_vars['number'] );
+			                }
+
+                if ( 'ids' == $this->query_vars['fields'] ) {
+			                        $this->sites = $site_ids;
+			
+			                        return $this->sites;
+                }
+
+                // Fetch full site objects from the primed cache.
+                $_sites = array();
+                foreach ( $site_ids as $site_id ) {
+			                        if ( $_site = get_site( $site_id ) ) {
+				                                $_sites[] = $_site;
+				                        }
+                }
+
+                // Prime site network caches.
+                if ( $this->query_vars['update_site_cache'] ) {
+			                        $site_ids = array();
+			                        foreach ( $_sites as $_site ) {
+				                                $site_ids[] = $_site->site_id;
+				                        }
+                        _prime_site_caches( $site_ids );
+                }
+
+                /**
+                 * Filter the site query results.
+                 *
+                 * @since 4.6.0
+                 *
+                 * @param array $results An array of sites.
+                 * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference.
+                 */
+                $_sites = apply_filters_ref_array( 'the_sites', array( $_sites, &$this ) );
+
+                // Convert to WP_Site instances
+                $sites = array_map( 'get_site', $_sites );
+
+                $this->sites = $sites;
+
+                return $this->sites;
+        }
+
+        /**
+	         * Used internally to get a list of site IDs matching the query vars.
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         *
+	         * @global wpdb $wpdb WordPress database abstraction object.
+	         */
+        protected function get_site_ids() {
+		                global $wpdb;
+
+                $order = ( 'ASC' == strtoupper( $this->query_vars['order'] ) ) ? 'ASC' : 'DESC';
+
+                // Disable ORDER BY with 'none', an empty array, or boolean false.
+                if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {
+			                        $orderby = '';
+			                } elseif ( ! empty( $this->query_vars['orderby'] ) ) {
+			                        $ordersby = is_array( $this->query_vars['orderby'] ) ?
+				                                $this->query_vars['orderby'] :
+				                                preg_split( '/[,\s]/', $this->query_vars['orderby'] );
+			
+			                        $orderby_array         = array();
+			                        $found_orderby_blog_id = false;
+			                        foreach ( $ordersby as $_key => $_value ) {
+				                                if ( ! $_value ) {
+					                                        continue;
+                                }
+
+                                if ( is_int( $_key ) ) {
+					                                        $_orderby = $_value;
+					                                        $_order   = $order;
+					                                } else {
+					                                        $_orderby = $_key;
+					                                        $_order   = $_value;
+					                                }
+
+                                if ( ! $found_orderby_blog_id && in_array( $_orderby, array( 'blog_id', 'site__in' ) ) ) {
+					                                        $found_orderby_blog_id = true;
+					                                }
+
+                                $parsed = $this->parse_orderby( $_orderby );
+
+                                if ( ! $parsed ) {
+					                                        continue;
+                                }
+
+                                if ( 'site__in' === $_orderby ) {
+					                                        $orderby_array[] = $parsed;
+					                                        continue;
+                                }
+
+                                $orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
+                        }
+
+                        $orderby = implode( ', ', $orderby_array );
+                } else {
+			                        $orderby = "blog_id $order";
+			                }
+
+                $number = absint( $this->query_vars['number'] );
+                $offset = absint( $this->query_vars['offset'] );
+
+                if ( ! empty( $number ) ) {
+			                        if ( $offset ) {
+				                                $limits = 'LIMIT ' . $offset . ',' . $number;
+				                        } else {
+				                                $limits = 'LIMIT ' . $number;
+				                        }
+                }
+
+                if ( $this->query_vars['count'] ) {
+			                        $fields = 'COUNT(*)';
+			                } else {
+			                        $fields = "blog_id";
+			                }
+
+                // Parse site IDs for an IN clause.
+                $site_id = absint( $this->query_vars['ID'] );
+                if ( ! empty( $site_id ) ) {
+			                        $this->sql_clauses['where']['ID'] = $wpdb->prepare( 'blog_id = %d', $site_id );
+			                }
+
+                // Parse site IDs for an IN clause.
+                if ( ! empty( $this->query_vars['site__in'] ) ) {
+			                        $this->sql_clauses['where']['site__in'] = "blog_id IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['site__in'] ) ) . ' )';
+			                }
+
+                // Parse site IDs for a NOT IN clause.
+                if ( ! empty( $this->query_vars['site__not_in'] ) ) {
+			                        $this->sql_clauses['where']['site__not_in'] = "blog_id NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['site__not_in'] ) ) . ' )';
+			                }
+
+                $network_id = absint( $this->query_vars['network_id'] );
+                if ( ! empty( $network_id ) ) {
+			                        $this->sql_clauses['where']['network_id'] = $wpdb->prepare( 'site_id = %d', $network_id );
+			                }
+
+                // Parse site network IDs for an IN clause.
+                if ( ! empty( $this->query_vars['network__in'] ) ) {
+			                        $this->sql_clauses['where']['network__in'] = 'site_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['network__in'] ) ) . ' )';
+			                }
+
+                // Parse site network IDs for a NOT IN clause.
+                if ( ! empty( $this->query_vars['network__not_in'] ) ) {
+			                        $this->sql_clauses['where']['network__not_in'] = 'site_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['network__not_in'] ) ) . ' )';
+			                }
+
+
+                if ( ! empty( $this->query_vars['domain'] ) ) {
+			                        $this->sql_clauses['where']['domain'] = $wpdb->prepare( 'domain = %s', $this->query_vars['domain'] );
+			                }
+
+                // Parse site domain for an IN clause.
+                if ( is_array( $this->query_vars['domain__in'] ) ) {
+			                        $this->sql_clauses['where']['domain__in'] = "domain IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['domain__in'] ) ) . "' )";
+			                }
+
+                // Parse site domain for a NOT IN clause.
+                if ( is_array( $this->query_vars['domain__not_in'] ) ) {
+			                        $this->sql_clauses['where']['domain__not_in'] = "domain NOT IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['domain__not_in'] ) ) . "' )";
+			                }
+
+
+                if ( ! empty( $this->query_vars['path'] ) ) {
+			                        $this->sql_clauses['where']['path'] = $wpdb->prepare( 'path = %s', $this->query_vars['path'] );
+			                }
+
+                // Parse site path for an IN clause.
+                if ( is_array( $this->query_vars['path__in'] ) ) {
+			                        $this->sql_clauses['where']['path__in'] = "path IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['path__in'] ) ) . "' )";
+			                }
+
+                // Parse site path for a NOT IN clause.
+                if ( is_array( $this->query_vars['path__not_in'] ) ) {
+			                        $this->sql_clauses['where']['path__not_in'] = "path NOT IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['path__not_in'] ) ) . "' )";
+			                }
+
+
+                if ( is_numeric( $this->query_vars['archived'] ) ) {
+			                        $archived                               = absint( $this->query_vars['archived'] );
+			                        $this->sql_clauses['where']['archived'] = $wpdb->prepare( "archived = %d ", $archived );
+			                }
+
+                if ( is_numeric( $this->query_vars['mature'] ) ) {
+			                        $mature                               = absint( $this->query_vars['mature'] );
+			                        $this->sql_clauses['where']['mature'] = $wpdb->prepare( "mature = %d ", $mature );
+			                }
+
+                if ( is_numeric( $this->query_vars['spam'] ) ) {
+			                        $spam                               = absint( $this->query_vars['spam'] );
+			                        $this->sql_clauses['where']['spam'] = $wpdb->prepare( "spam = %d ", $spam );
+			                }
+
+                if ( is_numeric( $this->query_vars['deleted'] ) ) {
+			                        $deleted                               = absint( $this->query_vars['deleted'] );
+			                        $this->sql_clauses['where']['deleted'] = $wpdb->prepare( "deleted = %d ", $deleted );
+			                }
+
+                if ( is_numeric( $this->query_vars['public'] ) ) {
+			                        $public                               = absint( $this->query_vars['public'] );
+			                        $this->sql_clauses['where']['public'] = $wpdb->prepare( "public = %d ", $public );
+			                }
+
+                // Falsy search strings are ignored.
+                if ( strlen( $this->query_vars['search'] ) ) {
+			                        $search_sql = $this->get_search_sql(
+					                                $this->query_vars['search'],
+                                array( 'domain', 'path' )
+			                                                               );
+
+                        // Strip leading 'AND'.
+                        $this->sql_clauses['where']['search'] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
+                }
+
+                $date_query = $this->query_vars['date_query'];
+                if ( ! empty( $date_query ) && is_array( $date_query ) ) {
+			                        $date_query_object                        = new WP_Date_Query( $date_query, 'registered' );
+			                        $this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $date_query_object->get_sql() );
+			                }
+
+                $where = implode( ' AND ', $this->sql_clauses['where'] );
+
+                $pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );
+                /**
+                 * Filter the site query clauses.
+                 *
+                 * @since 4.6.0
+                 *
+                 * @param array $pieces A compacted array of site query clauses.
+                 * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference.
+                 */
+                $clauses = apply_filters_ref_array( 'sites_clauses', array( compact( $pieces ), &$this ) );
+                $fields  = isset( $clauses['fields'] ) ? $clauses['fields'] : '';
+                $join    = isset( $clauses['join'] ) ? $clauses['join'] : '';
+                $where   = isset( $clauses['where'] ) ? $clauses['where'] : '';
+                $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : '';
+                $limits  = isset( $clauses['limits'] ) ? $clauses['limits'] : '';
+                $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : '';
+
+                $this->filtered_where_clause = $where;
+
+                if ( $where ) {
+			                        $where = 'WHERE ' . $where;
+			                }
+
+                if ( $groupby ) {
+			                        $groupby = 'GROUP BY ' . $groupby;
+			                }
+
+                if ( $orderby ) {
+			                        $orderby = "ORDER BY $orderby";
+			                }
+
+                $found_rows = '';
+                if ( ! $this->query_vars['no_found_rows'] ) {
+			                        $found_rows = 'SQL_CALC_FOUND_ROWS';
+			                }
+
+                $this->sql_clauses['select']  = "SELECT $found_rows $fields";
+                $this->sql_clauses['from']    = "FROM $wpdb->blogs $join";
+                $this->sql_clauses['groupby'] = $groupby;
+                $this->sql_clauses['orderby'] = $orderby;
+                $this->sql_clauses['limits']  = $limits;
+
+                $this->request = "{$this->sql_clauses['select']} {$this->sql_clauses['from']} {$where} {$this->sql_clauses['groupby']} {$this->sql_clauses['orderby']} {$this->sql_clauses['limits']}";
+
+                if ( $this->query_vars['count'] ) {
+			                        return intval( $wpdb->get_var( $this->request ) );
+                } else {
+			                        $site_ids = $wpdb->get_col( $this->request );
+			
+			                        return array_map( 'intval', $site_ids );
+                }
+        }
+
+        /**
+	         * Used internally to generate an SQL string for searching across multiple columns
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         *
+	         * @global wpdb $wpdb WordPress database abstraction object.
+	         *
+	         * @param string $string
+	         * @param array $cols
+	         *
+	         * @return string
+	         */
+        protected function get_search_sql( $string, $cols ) {
+		                global $wpdb;
+
+                $like = '%' . $wpdb->esc_like( $string ) . '%';
+
+                $searches = array();
+                foreach ( $cols as $col ) {
+			                        $searches[] = $wpdb->prepare( "$col LIKE %s", $like );
+			                }
+
+                return ' AND (' . implode( ' OR ', $searches ) . ')';
+        }
+
+        /**
+	         * Parse and sanitize 'orderby' keys passed to the site query.
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         *
+	         * @global wpdb $wpdb WordPress database abstraction object.
+	         *
+	         * @param string $orderby Alias for the field to order by.
+	         *
+	         * @return string|false Value to used in the ORDER clause. False otherwise.
+	         */
+        protected function parse_orderby( $orderby ) {
+		                global $wpdb;
+
+                switch ( $orderby ) {
+		                        case 'domain':
+				                        case 'last_updated':
+				                        case 'path':
+				                        case 'registered':
+				                                $_orderby = $orderby;
+				                                break;
+                        case 'network_id':
+				                                $_orderby = "site_id";
+				                                break;
+                        case 'domain_length':
+				                                $_orderby = "CHAR_LENGTH(domain)";
+				                                break;
+                        case 'path_length':
+				                                $_orderby = "CHAR_LENGTH(path)";
+				                                break;
+                        case 'ids':
+				                        default:
+				                                $_orderby = "blog_id";
+				                                break;
+                }
+
+                $parsed = "$_orderby";
+
+
+                return $parsed;
+        }
+
+        /**
+	         * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
+	         *
+	         * @since 4.6.0
+	         * @access protected
+	         *
+	         * @param string $order The 'order' query variable.
+	         *
+	         * @return string The sanitized 'order' query variable.
+	         */
+        protected function parse_order( $order ) {
+		                if ( ! is_string( $order ) || empty( $order ) ) {
+			                        return 'DESC';
+                }
+
+                if ( 'ASC' === strtoupper( $order ) ) {
+			                        return 'ASC';
+                } else {
+			                        return 'DESC';
+                }
+        }
+}
\ No newline at end of file
Index: wp-includes/date.php
===================================================================
--- wp-includes/date.php	(revision 37273)
+++ wp-includes/date.php	(working copy)
@@ -491,7 +491,7 @@
 		$valid_columns = array(
 			'post_date', 'post_date_gmt', 'post_modified',
 			'post_modified_gmt', 'comment_date', 'comment_date_gmt',
-			'user_registered',
+			'user_registered', 'registered', 'last_updated',
 		);
 
 		// Attempt to detect a table prefix.
@@ -525,6 +525,10 @@
 				$wpdb->users => array(
 					'user_registered',
 				),
+				$wpdb->blogs => array(
+					'registered',
+					'last_updated',
+				),
 			);
 
 			// If it's a known column name, add the appropriate table prefix.
Index: wp-includes/ms-blogs.php
===================================================================
--- wp-includes/ms-blogs.php	(revision 37273)
+++ wp-includes/ms-blogs.php	(working copy)
@@ -468,6 +468,101 @@
 }
 
 /**
+ * Retrieves site data given a site ID or site object.
+ *
+ * If an object is passed then the site data will be cached and then returned
+ * after being passed through a filter. If the site is empty, then the global
+ * site variable will be used, if it is set.
+ *
+ * @since 4.6.0
+ *
+ * @global WP_Site $site
+ *
+ * @param WP_Site|string|int $site Site to retrieve.
+ * @param string $output Optional. OBJECT or ARRAY_A or ARRAY_N constants.
+ *
+ * @return WP_Site|array|null Depends on $output value.
+ */
+function get_site( &$site = null, $output = OBJECT ) {
+	global $current_blog;
+	if ( empty( $site ) && isset( $current_blog ) ) {
+		$site = $current_blog;
+	}
+
+	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 mixed $_site Site data.
+	 */
+	$_site = apply_filters( 'get_site', $_site );
+
+	if ( $output == OBJECT ) {
+		return $_site;
+	} elseif ( $output == ARRAY_A ) {
+		return $_site->to_array();
+	} elseif ( $output == ARRAY_N ) {
+		return array_values( $_site->to_array() );
+	}
+
+	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( ",", $non_cached_ids ) ) );
+
+		update_site_cache( $fresh_sites );
+	}
+}
+
+/**
+ * Updates sites in cache.
+ *
+ * @since 4.6.0
+ *
+ * @param array $sites Array of site objects, passed by reference.
+ */
+function update_site_cache( &$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' );
+	}
+}
+
+/**
  * Retrieve option value for a given blog id based on name of option.
  *
  * If the option does not exist or does not have a value, then the return value
Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 37273)
+++ wp-settings.php	(working copy)
@@ -99,6 +99,7 @@
 
 // Initialize multisite if enabled.
 if ( is_multisite() ) {
+	require( ABSPATH . WPINC . '/class-wp-site-query.php' );
 	require( ABSPATH . WPINC . '/ms-blogs.php' );
 	require( ABSPATH . WPINC . '/ms-settings.php' );
 } elseif ( ! defined( 'MULTISITE' ) ) {
