<?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.
*/
#[AllowDynamicProperties]
class WP_Site_Query {

/**
* SQL for database query.
*
* @since 4.6.0
* @var string
*/
public $request;

/**
* SQL query clauses.
*
* @since 4.6.0
* @var array
*/
protected $sql_clauses = array(
'select' => '',
'from' => '',
'where' => array(),
'groupby' => '',
'orderby' => '',
'limits' => '',
);

/**
* Metadata query container.
*
* @since 5.1.0
* @var WP_Meta_Query
*/
public $meta_query = false;

/**
* Metadata query clauses.
*
* @since 5.1.0
* @var array
*/
protected $meta_query_clauses;

/**
* Date query container.
*
* @since 4.6.0
* @var WP_Date_Query A date query instance.
*/
public $date_query = false;

/**
* Query vars set by the user.
*
* @since 4.6.0
* @var array
*/
public $query_vars;

/**
* Default values for query vars.
*
* @since 4.6.0
* @var array
*/
public $query_var_defaults;

/**
* List of sites located by the query.
*
* @since 4.6.0
* @var array
*/
public $sites;

/**
* The amount of found sites for the current query.
*
* @since 4.6.0
* @var int
*/
public $found_sites = 0;

/**
* The number of pages.
*
* @since 4.6.0
* @var int
*/
public $max_num_pages = 0;

/**
* Sets up the site query, based on the query vars passed.
*
* @since 4.6.0
* @since 4.8.0 Introduced the 'lang_id', 'lang__in', and 'lang__not_in' parameters.
* @since 5.1.0 Introduced the 'update_site_meta_cache', 'meta_query', 'meta_key',
* 'meta_compare_key', 'meta_value', 'meta_type', and 'meta_compare' parameters.
* @since 5.3.0 Introduced the 'meta_type_key' parameter.
*
* @param string|array $query {
* Optional. Array or query string of site query parameters. Default empty.
*
* @type int[] $site__in Array of site IDs to include. Default empty.
* @type int[] $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'
* - 'network__in'
* - 'deleted'
* - 'mature'
* - 'spam'
* - 'archived'
* - 'public'
* - 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 int[] $network__in Array of network IDs to include affiliated sites for. Default empty.
* @type int[] $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 string[] $domain__in Array of domains to include affiliated sites for. Default empty.
* @type string[] $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 string[] $path__in Array of paths to include affiliated sites for. Default empty.
* @type string[] $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 string[] $lang__in Array of language IDs to include affiliated sites for. Default empty.
* @type string[] $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 string[] $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.
* @type bool $update_site_meta_cache Whether to prime the metadata cache for found sites. Default true.
* @type string|string[] $meta_key Meta key or keys to filter by.
* @type string|string[] $meta_value Meta value or values to filter by.
* @type string $meta_compare MySQL operator used for comparing the meta value.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_compare_key MySQL operator used for comparing the meta key.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_type MySQL data type that the meta_value column will be CAST to for comparisons.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_type_key MySQL data type that the meta_key column will be CAST to for comparisons.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type array $meta_query An associative array of WP_Meta_Query arguments.
* See WP_Meta_Query::__construct() for accepted values.
* }
*/
public function __construct( $query = '' ) {
$this->query_var_defaults = array(
'fields' => '',
'ID' => '',
'site__in' => '',
'site__not_in' => '',
'number' => 100,
'offset' => '',
'no_found_rows' => true,
'orderby' => 'id',
'order' => 'ASC',
'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,
'lang_id' => null,
'lang__in' => '',
'lang__not_in' => '',
'search' => '',
'search_columns' => array(),
'count' => false,
'date_query' => null, // See WP_Date_Query.
'update_site_cache' => true,
'update_site_meta_cache' => true,
'meta_query' => '',
'meta_key' => '',
'meta_value' => '',
'meta_type' => '',
'meta_compare' => '',
);

if ( ! empty( $query ) ) {
$this->query( $query );
}
}

/**
* Parses arguments passed to the site query with default query parameters.
*
* @since 4.6.0
*
* @see WP_Site_Query::__construct()
*
* @param string|array $query Array or string of 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 );

/**
* Fires after the site query vars have been parsed.
*
* @since 4.6.0
*
* @param WP_Site_Query $query The WP_Site_Query instance (passed by reference).
*/
do_action_ref_array( 'parse_site_query', array( &$this ) );
}

/**
* Sets up the WordPress query for retrieving sites.
*
* @since 4.6.0
*
* @param string|array $query Array or URL query string of parameters.
* @return WP_Site[]|int[]|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.
*/
public function query( $query ) {
$this->query_vars = wp_parse_args( $query );

return $this->get_sites();
}

/**
* Retrieves a list of sites matching the query vars.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return WP_Site[]|int[]|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.
*/
public function get_sites() {
global $wpdb;

$this->parse_query();

// Parse meta query.
$this->meta_query = new WP_Meta_Query();
$this->meta_query->parse_query_vars( $this->query_vars );

/**
* Fires before sites are retrieved.
*
* @since 4.6.0
*
* @param WP_Site_Query $query Current instance of WP_Site_Query (passed by reference).
*/
do_action_ref_array( 'pre_get_sites', array( &$this ) );

// Reparse query vars, in case they were modified in a 'pre_get_sites' callback.
$this->meta_query->parse_query_vars( $this->query_vars );
if ( ! empty( $this->meta_query->queries ) ) {
$this->meta_query_clauses = $this->meta_query->get_sql( 'blog', $wpdb->blogs, 'blog_id', $this );
}

$site_data = null;

/**
* Filters the site data before the get_sites query takes place.
*
* Return a non-null value to bypass WordPress' default site queries.
*
* The expected return type from this filter depends on the value passed
* in the request query vars:
* - When `$this->query_vars['count']` is set, the filter should return
* the site count as an integer.
* - When `'ids' === $this->query_vars['fields']`, the filter should return
* an array of site IDs.
* - Otherwise the filter should return an array of WP_Site objects.
*
* Note that if the filter returns an array of site data, it will be assigned
* to the `sites` property of the current WP_Site_Query instance.
*
* Filtering functions that require pagination information are encouraged to set
* the `found_sites` and `max_num_pages` properties of the WP_Site_Query object,
* passed to the filter by reference. If WP_Site_Query does not perform a database
* query, it will not have enough information to generate these values itself.
*
* @since 5.2.0
* @since 5.6.0 The returned array of site data is assigned to the `sites` property
* of the current WP_Site_Query instance.
*
* @param WP_Site[]|int[]|int|null $site_data Return an array of site data to short-circuit WP's site query,
* the site count as an integer if `$this->query_vars['count']` is set,
* or null to run the normal queries.
* @param WP_Site_Query $query The WP_Site_Query instance, passed by reference.
*/
$site_data = apply_filters_ref_array( 'sites_pre_query', array( $site_data, &$this ) );

if ( null !== $site_data ) {
if ( is_array( $site_data ) && ! $this->query_vars['count'] ) {
$this->sites = $site_data;
}

return $site_data;
}

// $args can include anything. Only use the args defined in the query_var_defaults to compute the key.
$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );

// Ignore the $fields, $update_site_cache, $update_site_meta_cache argument as the queried result will be the same regardless.
unset( $_args['fields'], $_args['update_site_cache'], $_args['update_site_meta_cache'] );

$key = md5( serialize( $_args ) );
$last_changed = wp_cache_get_last_changed( 'sites' );

$cache_key = "get_sites:$key:$last_changed";
$cache_value = wp_cache_get( $cache_key, 'site-queries' );

if ( false === $cache_value ) {
$site_ids = $this->get_site_ids();
if ( $site_ids ) {
$this->set_found_sites();
}

$cache_value = array(
'site_ids' => $site_ids,
'found_sites' => $this->found_sites,
);
wp_cache_add( $cache_key, $cache_value, 'site-queries' );
} else {
$site_ids = $cache_value['site_ids'];
$this->found_sites = $cache_value['found_sites'];
}

if ( $this->found_sites && $this->query_vars['number'] ) {
$this->max_num_pages = (int) ceil( $this->found_sites / $this->query_vars['number'] );
}

// 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 (int) $site_ids;
}

$site_ids = array_map( 'intval', $site_ids );

if ( $this->query_vars['update_site_meta_cache'] ) {
wp_lazyload_site_meta( $site_ids );
}

if ( 'ids' === $this->query_vars['fields'] ) {
$this->sites = $site_ids;

return $this->sites;
}

// Prime site network caches.
if ( $this->query_vars['update_site_cache'] ) {
_prime_site_caches( $site_ids, false );
}

// Fetch full site objects from the primed cache.
$_sites = array();
foreach ( $site_ids as $site_id ) {
$_site = get_site( $site_id );
if ( $_site ) {
$_sites[] = $_site;
}
}

/**
* Filters the site query results.
*
* @since 4.6.0
*
* @param WP_Site[] $_sites An array of WP_Site objects.
* @param WP_Site_Query $query Current instance of WP_Site_Query (passed by reference).
*/
$_sites = apply_filters_ref_array( 'the_sites', array( $_sites, &$this ) );

// Convert to WP_Site instances.
$this->sites = array_map( 'get_site', $_sites );

return $this->sites;
}

/**
* Used internally to get a list of site IDs matching the query vars.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return int|array A single count of site IDs if a count query. An array of site IDs if a full query.
*/
protected function get_site_ids() {
global $wpdb;

$order = $this->parse_order( $this->query_vars['order'] );

// 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();
foreach ( $ordersby as $_key => $_value ) {
if ( ! $_value ) {
continue;
}

if ( is_int( $_key ) ) {
$_orderby = $_value;
$_order = $order;
} else {
$_orderby = $_key;
$_order = $_value;
}

$parsed = $this->parse_orderby( $_orderby );

if ( ! $parsed ) {
continue;
}

if ( 'site__in' === $_orderby || 'network__in' === $_orderby ) {
$orderby_array[] = $parsed;
continue;
}

$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
}

$orderby = implode( ', ', $orderby_array );
} else {
$orderby = "{$wpdb->blogs}.blog_id $order";
}

$number = absint( $this->query_vars['number'] );
$offset = absint( $this->query_vars['offset'] );
$limits = '';

if ( ! empty( $number ) ) {
if ( $offset ) {
$limits = 'LIMIT ' . $offset . ',' . $number;
} else {
$limits = 'LIMIT ' . $number;
}
}

if ( $this->query_vars['count'] ) {
$fields = 'COUNT(*)';
} else {
$fields = "{$wpdb->blogs}.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'] = $wpdb->prepare( "{$wpdb->blogs}.blog_id = %d", $site_id );
}

// Parse site IDs for an IN clause.
if ( ! empty( $this->query_vars['site__in'] ) ) {
$this->sql_clauses['where']['site__in'] = "{$wpdb->blogs}.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'] ) ) {
$this->sql_clauses['where']['site__not_in'] = "{$wpdb->blogs}.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 = %s ', absint( $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 );
}

if ( is_numeric( $this->query_vars['lang_id'] ) ) {
$lang_id = absint( $this->query_vars['lang_id'] );
$this->sql_clauses['where']['lang_id'] = $wpdb->prepare( 'lang_id = %d ', $lang_id );
}

// Parse site language IDs for an IN clause.
if ( ! empty( $this->query_vars['lang__in'] ) ) {
$this->sql_clauses['where']['lang__in'] = 'lang_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['lang__in'] ) ) . ' )';
}

// Parse site language IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['lang__not_in'] ) ) {
$this->sql_clauses['where']['lang__not_in'] = 'lang_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['lang__not_in'] ) ) . ' )';
}

// Falsey search strings are ignored.
if ( strlen( $this->query_vars['search'] ) ) {
$search_columns = array();

if ( $this->query_vars['search_columns'] ) {
$search_columns = array_intersect( $this->query_vars['search_columns'], array( 'domain', 'path' ) );
}

if ( ! $search_columns ) {
$search_columns = array( 'domain', 'path' );
}

/**
* Filters the columns to search in a WP_Site_Query search.
*
* The default columns include 'domain' and 'path.
*
* @since 4.6.0
*
* @param string[] $search_columns Array of column names to be searched.
* @param string $search Text being searched.
* @param WP_Site_Query $query The current WP_Site_Query instance.
*/
$search_columns = apply_filters( 'site_search_columns', $search_columns, $this->query_vars['search'], $this );

$this->sql_clauses['where']['search'] = $this->get_search_sql( $this->query_vars['search'], $search_columns );
}

$date_query = $this->query_vars['date_query'];
if ( ! empty( $date_query ) && is_array( $date_query ) ) {
$this->date_query = new WP_Date_Query( $date_query, 'registered' );

// Strip leading 'AND'.
$this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() );
}

$join = '';
$groupby = '';

if ( ! empty( $this->meta_query_clauses ) ) {
$join .= $this->meta_query_clauses['join'];

// Strip leading 'AND'.
$this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $this->meta_query_clauses['where'] );

if ( ! $this->query_vars['count'] ) {
$groupby = "{$wpdb->blogs}.blog_id";
}
}

$where = implode( ' AND ', $this->sql_clauses['where'] );

$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );

/**
* Filters the site query clauses.
*
* @since 4.6.0
*
* @param string[] $clauses {
* Associative array of the clauses for the query.
*
* @type string $fields The SELECT clause of the query.
* @type string $join The JOIN clause of the query.
* @type string $where The WHERE clause of the query.
* @type string $orderby The ORDER BY clause of the query.
* @type string $limits The LIMIT clause of the query.
* @type string $groupby The GROUP BY clause of the query.
* }
* @param WP_Site_Query $query 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'] : '';

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;

// Beginning of the string is on a new line to prevent leading whitespace. See https://core.trac.wordpress.org/ticket/56841.
$this->request =
"{$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 (int) $wpdb->get_var( $this->request );
}

$site_ids = $wpdb->get_col( $this->request );

return array_map( 'intval', $site_ids );
}

/**
* Populates found_sites and max_num_pages properties for the current query
* if the limit clause was used.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
private function set_found_sites() {
global $wpdb;

if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
/**
* Filters 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 );
}
}

/**
* Used internally to generate an SQL string for searching across multiple columns.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $search Search string.
* @param string[] $columns Array of columns to search.
* @return string Search SQL.
*/
protected function get_search_sql( $search, $columns ) {
global $wpdb;

if ( str_contains( $search, '*' ) ) {
$like = '%' . implode( '%', array_map( array( $wpdb, 'esc_like' ), explode( '*', $search ) ) ) . '%';
} else {
$like = '%' . $wpdb->esc_like( $search ) . '%';
}

$searches = array();
foreach ( $columns as $column ) {
$searches[] = $wpdb->prepare( "$column LIKE %s", $like );
}

return '(' . implode( ' OR ', $searches ) . ')';
}

/**
* Parses and sanitizes 'orderby' keys passed to the site query.
*
* @since 4.6.0
*
* @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;

$parsed = false;

switch ( $orderby ) {
case 'site__in':
$site__in = implode( ',', array_map( 'absint', $this->query_vars['site__in'] ) );
$parsed = "FIELD( {$wpdb->blogs}.blog_id, $site__in )";
break;
case 'network__in':
$network__in = implode( ',', array_map( 'absint', $this->query_vars['network__in'] ) );
$parsed = "FIELD( {$wpdb->blogs}.site_id, $network__in )";
break;
case 'domain':
case 'last_updated':
case 'path':
case 'registered':
case 'deleted':
case 'spam':
case 'mature':
case 'archived':
case 'public':
$parsed = $orderby;
break;
case 'network_id':
$parsed = 'site_id';
break;
case 'domain_length':
$parsed = 'CHAR_LENGTH(domain)';
break;
case 'path_length':
$parsed = 'CHAR_LENGTH(path)';
break;
case 'id':
$parsed = "{$wpdb->blogs}.blog_id";
break;
}

if ( ! empty( $parsed ) || empty( $this->meta_query_clauses ) ) {
return $parsed;
}

$meta_clauses = $this->meta_query->get_clauses();
if ( empty( $meta_clauses ) ) {
return $parsed;
}

$primary_meta_query = reset( $meta_clauses );
if ( ! empty( $primary_meta_query['key'] ) && $primary_meta_query['key'] === $orderby ) {
$orderby = 'meta_value';
}

switch ( $orderby ) {
case 'meta_value':
if ( ! empty( $primary_meta_query['type'] ) ) {
$parsed = "CAST({$primary_meta_query['alias']}.meta_value AS {$primary_meta_query['cast']})";
} else {
$parsed = "{$primary_meta_query['alias']}.meta_value";
}
break;
case 'meta_value_num':
$parsed = "{$primary_meta_query['alias']}.meta_value+0";
break;
default:
if ( isset( $meta_clauses[ $orderby ] ) ) {
$meta_clause = $meta_clauses[ $orderby ];
$parsed = "CAST({$meta_clause['alias']}.meta_value AS {$meta_clause['cast']})";
}
}

return $parsed;
}

/**
* Parses an 'order' query variable and cast it to 'ASC' or 'DESC' as necessary.
*
* @since 4.6.0
*
* @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 'ASC';
}

if ( 'ASC' === strtoupper( $order ) ) {
return 'ASC';
} else {
return 'DESC';
}
}
}