<?php
/**
* Site API
*
* @package WordPress
* @subpackage Multisite
* @since 5.1.0
*/

/**
* Inserts a new site into the database.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param array $data {
* Data for the new site that should be inserted.
*
* @type string $domain Site domain. Default empty string.
* @type string $path Site path. Default '/'.
* @type int $network_id The site's network ID. Default is the current network ID.
* @type string $registered When the site was registered, in SQL datetime format. Default is
* the current time.
* @type string $last_updated When the site was last updated, in SQL datetime format. Default is
* the value of $registered.
* @type int $public Whether the site is public. Default 1.
* @type int $archived Whether the site is archived. Default 0.
* @type int $mature Whether the site is mature. Default 0.
* @type int $spam Whether the site is spam. Default 0.
* @type int $deleted Whether the site is deleted. Default 0.
* @type int $lang_id The site's language ID. Currently unused. Default 0.
* @type int $user_id User ID for the site administrator. Passed to the
* `wp_initialize_site` hook.
* @type string $title Site title. Default is 'Site %d' where %d is the site ID. Passed
* to the `wp_initialize_site` hook.
* @type array $options Custom option $key => $value pairs to use. Default empty array. Passed
* to the `wp_initialize_site` hook.
* @type array $meta Custom site metadata $key => $value pairs to use. Default empty array.
* Passed to the `wp_initialize_site` hook.
* }
* @return int|WP_Error The new site's ID on success, or error object on failure.
*/
function wp_insert_site( array $data ) {
global $wpdb;

$now = current_time( 'mysql', true );

$defaults = array(
'domain' => '',
'path' => '/',
'network_id' => get_current_network_id(),
'registered' => $now,
'last_updated' => $now,
'public' => 1,
'archived' => 0,
'mature' => 0,
'spam' => 0,
'deleted' => 0,
'lang_id' => 0,
);

$prepared_data = wp_prepare_site_data( $data, $defaults );
if ( is_wp_error( $prepared_data ) ) {
return $prepared_data;
}

if ( false === $wpdb->insert( $wpdb->blogs, $prepared_data ) ) {
return new WP_Error( 'db_insert_error', __( 'Could not insert site into the database.' ), $wpdb->last_error );
}

$site_id = (int) $wpdb->insert_id;

clean_blog_cache( $site_id );

$new_site = get_site( $site_id );

if ( ! $new_site ) {
return new WP_Error( 'get_site_error', __( 'Could not retrieve site data.' ) );
}

/**
* Fires once a site has been inserted into the database.
*
* @since 5.1.0
*
* @param WP_Site $new_site New site object.
*/
do_action( 'wp_insert_site', $new_site );

// Extract the passed arguments that may be relevant for site initialization.
$args = array_diff_key( $data, $defaults );
if ( isset( $args['site_id'] ) ) {
unset( $args['site_id'] );
}

/**
* Fires when a site's initialization routine should be executed.
*
* @since 5.1.0
*
* @param WP_Site $new_site New site object.
* @param array $args Arguments for the initialization.
*/
do_action( 'wp_initialize_site', $new_site, $args );

// Only compute extra hook parameters if the deprecated hook is actually in use.
if ( has_action( 'wpmu_new_blog' ) ) {
$user_id = ! empty( $args['user_id'] ) ? $args['user_id'] : 0;
$meta = ! empty( $args['options'] ) ? $args['options'] : array();

// WPLANG was passed with `$meta` to the `wpmu_new_blog` hook prior to 5.1.0.
if ( ! array_key_exists( 'WPLANG', $meta ) ) {
$meta['WPLANG'] = get_network_option( $new_site->network_id, 'WPLANG' );
}

/*
* Rebuild the data expected by the `wpmu_new_blog` hook prior to 5.1.0 using allowed keys.
* The `$allowed_data_fields` matches the one used in `wpmu_create_blog()`.
*/
$allowed_data_fields = array( 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' );
$meta = array_merge( array_intersect_key( $data, array_flip( $allowed_data_fields ) ), $meta );

/**
* Fires immediately after a new site is created.
*
* @since MU (3.0.0)
* @deprecated 5.1.0 Use {@see 'wp_initialize_site'} instead.
*
* @param int $site_id Site ID.
* @param int $user_id User ID.
* @param string $domain Site domain.
* @param string $path Site path.
* @param int $network_id Network ID. Only relevant on multi-network installations.
* @param array $meta Meta data. Used to set initial site options.
*/
do_action_deprecated(
'wpmu_new_blog',
array( $new_site->id, $user_id, $new_site->domain, $new_site->path, $new_site->network_id, $meta ),
'5.1.0',
'wp_initialize_site'
);
}

return (int) $new_site->id;
}

/**
* Updates a site in the database.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int $site_id ID of the site that should be updated.
* @param array $data Site data to update. See {@see wp_insert_site()} for the list of supported keys.
* @return int|WP_Error The updated site's ID on success, or error object on failure.
*/
function wp_update_site( $site_id, array $data ) {
global $wpdb;

if ( empty( $site_id ) ) {
return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) );
}

$old_site = get_site( $site_id );
if ( ! $old_site ) {
return new WP_Error( 'site_not_exist', __( 'Site does not exist.' ) );
}

$defaults = $old_site->to_array();
$defaults['network_id'] = (int) $defaults['site_id'];
$defaults['last_updated'] = current_time( 'mysql', true );
unset( $defaults['blog_id'], $defaults['site_id'] );

$data = wp_prepare_site_data( $data, $defaults, $old_site );
if ( is_wp_error( $data ) ) {
return $data;
}

if ( false === $wpdb->update( $wpdb->blogs, $data, array( 'blog_id' => $old_site->id ) ) ) {
return new WP_Error( 'db_update_error', __( 'Could not update site in the database.' ), $wpdb->last_error );
}

clean_blog_cache( $old_site );

$new_site = get_site( $old_site->id );

/**
* Fires once a site has been updated in the database.
*
* @since 5.1.0
*
* @param WP_Site $new_site New site object.
* @param WP_Site $old_site Old site object.
*/
do_action( 'wp_update_site', $new_site, $old_site );

return (int) $new_site->id;
}

/**
* Deletes a site from the database.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int $site_id ID of the site that should be deleted.
* @return WP_Site|WP_Error The deleted site object on success, or error object on failure.
*/
function wp_delete_site( $site_id ) {
global $wpdb;

if ( empty( $site_id ) ) {
return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) );
}

$old_site = get_site( $site_id );
if ( ! $old_site ) {
return new WP_Error( 'site_not_exist', __( 'Site does not exist.' ) );
}

$errors = new WP_Error();

/**
* Fires before a site should be deleted from the database.
*
* Plugins should amend the `$errors` object via its `WP_Error::add()` method. If any errors
* are present, the site will not be deleted.
*
* @since 5.1.0
*
* @param WP_Error $errors Error object to add validation errors to.
* @param WP_Site $old_site The site object to be deleted.
*/
do_action( 'wp_validate_site_deletion', $errors, $old_site );

if ( ! empty( $errors->errors ) ) {
return $errors;
}

/**
* Fires before a site is deleted.
*
* @since MU (3.0.0)
* @deprecated 5.1.0
*
* @param int $site_id The site ID.
* @param bool $drop True if site's table should be dropped. Default false.
*/
do_action_deprecated( 'delete_blog', array( $old_site->id, true ), '5.1.0' );

/**
* Fires when a site's uninitialization routine should be executed.
*
* @since 5.1.0
*
* @param WP_Site $old_site Deleted site object.
*/
do_action( 'wp_uninitialize_site', $old_site );

if ( is_site_meta_supported() ) {
$blog_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->blogmeta WHERE blog_id = %d ", $old_site->id ) );
foreach ( $blog_meta_ids as $mid ) {
delete_metadata_by_mid( 'blog', $mid );
}
}

if ( false === $wpdb->delete( $wpdb->blogs, array( 'blog_id' => $old_site->id ) ) ) {
return new WP_Error( 'db_delete_error', __( 'Could not delete site from the database.' ), $wpdb->last_error );
}

clean_blog_cache( $old_site );

/**
* Fires once a site has been deleted from the database.
*
* @since 5.1.0
*
* @param WP_Site $old_site Deleted site object.
*/
do_action( 'wp_delete_site', $old_site );

/**
* Fires after the site is deleted from the network.
*
* @since 4.8.0
* @deprecated 5.1.0
*
* @param int $site_id The site ID.
* @param bool $drop True if site's tables should be dropped. Default false.
*/
do_action_deprecated( 'deleted_blog', array( $old_site->id, true ), '5.1.0' );

return $old_site;
}

/**
* 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
* @since 5.1.0 Introduced the `$update_meta_cache` parameter.
* @since 6.1.0 This function is no longer marked as "private".
* @since 6.3.0 Use wp_lazyload_site_meta() for lazy-loading of site meta.
*
* @see update_site_cache()
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param array $ids ID list.
* @param bool $update_meta_cache Optional. Whether to update the meta cache. Default true.
*/
function _prime_site_caches( $ids, $update_meta_cache = true ) {
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)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared

update_site_cache( $fresh_sites, false );
}

if ( $update_meta_cache ) {
wp_lazyload_site_meta( $ids );
}
}

/**
* Queue site meta for lazy-loading.
*
* @since 6.3.0
*
* @param array $site_ids List of site IDs.
*/
function wp_lazyload_site_meta( array $site_ids ) {
if ( empty( $site_ids ) ) {
return;
}
$lazyloader = wp_metadata_lazyloader();
$lazyloader->queue_objects( 'blog', $site_ids );
}

/**
* Updates sites in cache.
*
* @since 4.6.0
* @since 5.1.0 Introduced the `$update_meta_cache` parameter.
*
* @param array $sites Array of site objects.
* @param bool $update_meta_cache Whether to update site meta cache. Default true.
*/
function update_site_cache( $sites, $update_meta_cache = true ) {
if ( ! $sites ) {
return;
}
$site_ids = array();
$site_data = array();
$blog_details_data = array();
foreach ( $sites as $site ) {
$site_ids[] = $site->blog_id;
$site_data[ $site->blog_id ] = $site;
$blog_details_data[ $site->blog_id . 'short' ] = $site;

}
wp_cache_add_multiple( $site_data, 'sites' );
wp_cache_add_multiple( $blog_details_data, 'blog-details' );

if ( $update_meta_cache ) {
update_sitemeta_cache( $site_ids );
}
}

/**
* Updates metadata cache for list of site IDs.
*
* Performs SQL query to retrieve all metadata for the sites matching `$site_ids` and stores them in the cache.
* Subsequent calls to `get_site_meta()` will not need to query the database.
*
* @since 5.1.0
*
* @param array $site_ids List of site IDs.
* @return array|false An array of metadata on success, false if there is nothing to update.
*/
function update_sitemeta_cache( $site_ids ) {
// Ensure this filter is hooked in even if the function is called early.
if ( ! has_filter( 'update_blog_metadata_cache', 'wp_check_site_meta_support_prefilter' ) ) {
add_filter( 'update_blog_metadata_cache', 'wp_check_site_meta_support_prefilter' );
}
return update_meta_cache( 'blog', $site_ids );
}

/**
* 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 string of arguments. See WP_Site_Query::__construct()
* for information on accepted arguments. Default empty array.
* @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.
*/
function get_sites( $args = array() ) {
$query = new WP_Site_Query();

return $query->query( $args );
}

/**
* Prepares site data for insertion or update in the database.
*
* @since 5.1.0
*
* @param array $data Associative array of site data passed to the respective function.
* See {@see wp_insert_site()} for the possibly included data.
* @param array $defaults Site data defaults to parse $data against.
* @param WP_Site|null $old_site Optional. Old site object if an update, or null if an insertion.
* Default null.
* @return array|WP_Error Site data ready for a database transaction, or WP_Error in case a validation
* error occurred.
*/
function wp_prepare_site_data( $data, $defaults, $old_site = null ) {

// Maintain backward-compatibility with `$site_id` as network ID.
if ( isset( $data['site_id'] ) ) {
if ( ! empty( $data['site_id'] ) && empty( $data['network_id'] ) ) {
$data['network_id'] = $data['site_id'];
}
unset( $data['site_id'] );
}

/**
* Filters passed site data in order to normalize it.
*
* @since 5.1.0
*
* @param array $data Associative array of site data passed to the respective function.
* See {@see wp_insert_site()} for the possibly included data.
*/
$data = apply_filters( 'wp_normalize_site_data', $data );

$allowed_data_fields = array( 'domain', 'path', 'network_id', 'registered', 'last_updated', 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' );
$data = array_intersect_key( wp_parse_args( $data, $defaults ), array_flip( $allowed_data_fields ) );

$errors = new WP_Error();

/**
* Fires when data should be validated for a site prior to inserting or updating in the database.
*
* Plugins should amend the `$errors` object via its `WP_Error::add()` method.
*
* @since 5.1.0
*
* @param WP_Error $errors Error object to add validation errors to.
* @param array $data Associative array of complete site data. See {@see wp_insert_site()}
* for the included data.
* @param WP_Site|null $old_site The old site object if the data belongs to a site being updated,
* or null if it is a new site being inserted.
*/
do_action( 'wp_validate_site_data', $errors, $data, $old_site );

if ( ! empty( $errors->errors ) ) {
return $errors;
}

// Prepare for database.
$data['site_id'] = $data['network_id'];
unset( $data['network_id'] );

return $data;
}

/**
* Normalizes data for a site prior to inserting or updating in the database.
*
* @since 5.1.0
*
* @param array $data Associative array of site data passed to the respective function.
* See {@see wp_insert_site()} for the possibly included data.
* @return array Normalized site data.
*/
function wp_normalize_site_data( $data ) {
// Sanitize domain if passed.
if ( array_key_exists( 'domain', $data ) ) {
$data['domain'] = preg_replace( '/[^a-z0-9\-.:]+/i', '', $data['domain'] );
}

// Sanitize path if passed.
if ( array_key_exists( 'path', $data ) ) {
$data['path'] = trailingslashit( '/' . trim( $data['path'], '/' ) );
}

// Sanitize network ID if passed.
if ( array_key_exists( 'network_id', $data ) ) {
$data['network_id'] = (int) $data['network_id'];
}

// Sanitize status fields if passed.
$status_fields = array( 'public', 'archived', 'mature', 'spam', 'deleted' );
foreach ( $status_fields as $status_field ) {
if ( array_key_exists( $status_field, $data ) ) {
$data[ $status_field ] = (int) $data[ $status_field ];
}
}

// Strip date fields if empty.
$date_fields = array( 'registered', 'last_updated' );
foreach ( $date_fields as $date_field ) {
if ( ! array_key_exists( $date_field, $data ) ) {
continue;
}

if ( empty( $data[ $date_field ] ) || '0000-00-00 00:00:00' === $data[ $date_field ] ) {
unset( $data[ $date_field ] );
}
}

return $data;
}

/**
* Validates data for a site prior to inserting or updating in the database.
*
* @since 5.1.0
*
* @param WP_Error $errors Error object, passed by reference. Will contain validation errors if
* any occurred.
* @param array $data Associative array of complete site data. See {@see wp_insert_site()}
* for the included data.
* @param WP_Site|null $old_site The old site object if the data belongs to a site being updated,
* or null if it is a new site being inserted.
*/
function wp_validate_site_data( $errors, $data, $old_site = null ) {
// A domain must always be present.
if ( empty( $data['domain'] ) ) {
$errors->add( 'site_empty_domain', __( 'Site domain must not be empty.' ) );
}

// A path must always be present.
if ( empty( $data['path'] ) ) {
$errors->add( 'site_empty_path', __( 'Site path must not be empty.' ) );
}

// A network ID must always be present.
if ( empty( $data['network_id'] ) ) {
$errors->add( 'site_empty_network_id', __( 'Site network ID must be provided.' ) );
}

// Both registration and last updated dates must always be present and valid.
$date_fields = array( 'registered', 'last_updated' );
foreach ( $date_fields as $date_field ) {
if ( empty( $data[ $date_field ] ) ) {
$errors->add( 'site_empty_' . $date_field, __( 'Both registration and last updated dates must be provided.' ) );
break;
}

// Allow '0000-00-00 00:00:00', although it be stripped out at this point.
if ( '0000-00-00 00:00:00' !== $data[ $date_field ] ) {
$month = substr( $data[ $date_field ], 5, 2 );
$day = substr( $data[ $date_field ], 8, 2 );
$year = substr( $data[ $date_field ], 0, 4 );
$valid_date = wp_checkdate( $month, $day, $year, $data[ $date_field ] );
if ( ! $valid_date ) {
$errors->add( 'site_invalid_' . $date_field, __( 'Both registration and last updated dates must be valid dates.' ) );
break;
}
}
}

if ( ! empty( $errors->errors ) ) {
return;
}

// If a new site, or domain/path/network ID have changed, ensure uniqueness.
if ( ! $old_site
|| $data['domain'] !== $old_site->domain
|| $data['path'] !== $old_site->path
|| $data['network_id'] !== $old_site->network_id
) {
if ( domain_exists( $data['domain'], $data['path'], $data['network_id'] ) ) {
$errors->add( 'site_taken', __( 'Sorry, that site already exists!' ) );
}
}
}

/**
* Runs the initialization routine for a given site.
*
* This process includes creating the site's database tables and
* populating them with defaults.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
* @global WP_Roles $wp_roles WordPress role management object.
*
* @param int|WP_Site $site_id Site ID or object.
* @param array $args {
* Optional. Arguments to modify the initialization behavior.
*
* @type int $user_id Required. User ID for the site administrator.
* @type string $title Site title. Default is 'Site %d' where %d is the
* site ID.
* @type array $options Custom option $key => $value pairs to use. Default
* empty array.
* @type array $meta Custom site metadata $key => $value pairs to use.
* Default empty array.
* }
* @return true|WP_Error True on success, or error object on failure.
*/
function wp_initialize_site( $site_id, array $args = array() ) {
global $wpdb, $wp_roles;

if ( empty( $site_id ) ) {
return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) );
}

$site = get_site( $site_id );
if ( ! $site ) {
return new WP_Error( 'site_invalid_id', __( 'Site with the ID does not exist.' ) );
}

if ( wp_is_site_initialized( $site ) ) {
return new WP_Error( 'site_already_initialized', __( 'The site appears to be already initialized.' ) );
}

$network = get_network( $site->network_id );
if ( ! $network ) {
$network = get_network();
}

$args = wp_parse_args(
$args,
array(
'user_id' => 0,
/* translators: %d: Site ID. */
'title' => sprintf( __( 'Site %d' ), $site->id ),
'options' => array(),
'meta' => array(),
)
);

/**
* Filters the arguments for initializing a site.
*
* @since 5.1.0
*
* @param array $args Arguments to modify the initialization behavior.
* @param WP_Site $site Site that is being initialized.
* @param WP_Network $network Network that the site belongs to.
*/
$args = apply_filters( 'wp_initialize_site_args', $args, $site, $network );

$orig_installing = wp_installing();
if ( ! $orig_installing ) {
wp_installing( true );
}

$switch = false;
if ( get_current_blog_id() !== $site->id ) {
$switch = true;
switch_to_blog( $site->id );
}

require_once ABSPATH . 'wp-admin/includes/upgrade.php';

// Set up the database tables.
make_db_current_silent( 'blog' );

$home_scheme = 'http';
$siteurl_scheme = 'http';
if ( ! is_subdomain_install() ) {
if ( 'https' === parse_url( get_home_url( $network->site_id ), PHP_URL_SCHEME ) ) {
$home_scheme = 'https';
}
if ( 'https' === parse_url( get_network_option( $network->id, 'siteurl' ), PHP_URL_SCHEME ) ) {
$siteurl_scheme = 'https';
}
}

// Populate the site's options.
populate_options(
array_merge(
array(
'home' => untrailingslashit( $home_scheme . '://' . $site->domain . $site->path ),
'siteurl' => untrailingslashit( $siteurl_scheme . '://' . $site->domain . $site->path ),
'blogname' => wp_unslash( $args['title'] ),
'admin_email' => '',
'upload_path' => get_network_option( $network->id, 'ms_files_rewriting' ) ? UPLOADBLOGSDIR . "/{$site->id}/files" : get_blog_option( $network->site_id, 'upload_path' ),
'blog_public' => (int) $site->public,
'WPLANG' => get_network_option( $network->id, 'WPLANG' ),
),
$args['options']
)
);

// Clean blog cache after populating options.
clean_blog_cache( $site );

// Populate the site's roles.
populate_roles();
$wp_roles = new WP_Roles();

// Populate metadata for the site.
populate_site_meta( $site->id, $args['meta'] );

// Remove all permissions that may exist for the site.
$table_prefix = $wpdb->get_blog_prefix();
delete_metadata( 'user', 0, $table_prefix . 'user_level', null, true ); // Delete all.
delete_metadata( 'user', 0, $table_prefix . 'capabilities', null, true ); // Delete all.

// Install default site content.
wp_install_defaults( $args['user_id'] );

// Set the site administrator.
add_user_to_blog( $site->id, $args['user_id'], 'administrator' );
if ( ! user_can( $args['user_id'], 'manage_network' ) && ! get_user_meta( $args['user_id'], 'primary_blog', true ) ) {
update_user_meta( $args['user_id'], 'primary_blog', $site->id );
}

if ( $switch ) {
restore_current_blog();
}

wp_installing( $orig_installing );

return true;
}

/**
* Runs the uninitialization routine for a given site.
*
* This process includes dropping the site's database tables and deleting its uploads directory.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int|WP_Site $site_id Site ID or object.
* @return true|WP_Error True on success, or error object on failure.
*/
function wp_uninitialize_site( $site_id ) {
global $wpdb;

if ( empty( $site_id ) ) {
return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) );
}

$site = get_site( $site_id );
if ( ! $site ) {
return new WP_Error( 'site_invalid_id', __( 'Site with the ID does not exist.' ) );
}

if ( ! wp_is_site_initialized( $site ) ) {
return new WP_Error( 'site_already_uninitialized', __( 'The site appears to be already uninitialized.' ) );
}

$users = get_users(
array(
'blog_id' => $site->id,
'fields' => 'ids',
)
);

// Remove users from the site.
if ( ! empty( $users ) ) {
foreach ( $users as $user_id ) {
remove_user_from_blog( $user_id, $site->id );
}
}

$switch = false;
if ( get_current_blog_id() !== $site->id ) {
$switch = true;
switch_to_blog( $site->id );
}

$uploads = wp_get_upload_dir();

$tables = $wpdb->tables( 'blog' );

/**
* Filters the tables to drop when the site is deleted.
*
* @since MU (3.0.0)
*
* @param string[] $tables Array of names of the site tables to be dropped.
* @param int $site_id The ID of the site to drop tables for.
*/
$drop_tables = apply_filters( 'wpmu_drop_tables', $tables, $site->id );

foreach ( (array) $drop_tables as $table ) {
$wpdb->query( "DROP TABLE IF EXISTS `$table`" ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
}

/**
* Filters the upload base directory to delete when the site is deleted.
*
* @since MU (3.0.0)
*
* @param string $basedir Uploads path without subdirectory. See {@see wp_upload_dir()}.
* @param int $site_id The site ID.
*/
$dir = apply_filters( 'wpmu_delete_blog_upload_dir', $uploads['basedir'], $site->id );
$dir = rtrim( $dir, DIRECTORY_SEPARATOR );
$top_dir = $dir;
$stack = array( $dir );
$index = 0;

while ( $index < count( $stack ) ) {
// Get indexed directory from stack.
$dir = $stack[ $index ];

// phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged
$dh = @opendir( $dir );
if ( $dh ) {
$file = @readdir( $dh );
while ( false !== $file ) {
if ( '.' === $file || '..' === $file ) {
$file = @readdir( $dh );
continue;
}

if ( @is_dir( $dir . DIRECTORY_SEPARATOR . $file ) ) {
$stack[] = $dir . DIRECTORY_SEPARATOR . $file;
} elseif ( @is_file( $dir . DIRECTORY_SEPARATOR . $file ) ) {
@unlink( $dir . DIRECTORY_SEPARATOR . $file );
}

$file = @readdir( $dh );
}
@closedir( $dh );
}
++$index;
}

$stack = array_reverse( $stack ); // Last added directories are deepest.
foreach ( (array) $stack as $dir ) {
if ( $dir !== $top_dir ) {
@rmdir( $dir );
}
}

// phpcs:enable WordPress.PHP.NoSilencedErrors.Discouraged
if ( $switch ) {
restore_current_blog();
}

return true;
}

/**
* Checks whether a site is initialized.
*
* A site is considered initialized when its database tables are present.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int|WP_Site $site_id Site ID or object.
* @return bool True if the site is initialized, false otherwise.
*/
function wp_is_site_initialized( $site_id ) {
global $wpdb;

if ( is_object( $site_id ) ) {
$site_id = $site_id->blog_id;
}
$site_id = (int) $site_id;

/**
* Filters the check for whether a site is initialized before the database is accessed.
*
* Returning a non-null value will effectively short-circuit the function, returning
* that value instead.
*
* @since 5.1.0
*
* @param bool|null $pre The value to return instead. Default null
* to continue with the check.
* @param int $site_id The site ID that is being checked.
*/
$pre = apply_filters( 'pre_wp_is_site_initialized', null, $site_id );
if ( null !== $pre ) {
return (bool) $pre;
}

$switch = false;
if ( get_current_blog_id() !== $site_id ) {
$switch = true;
remove_action( 'switch_blog', 'wp_switch_roles_and_user', 1 );
switch_to_blog( $site_id );
}

$suppress = $wpdb->suppress_errors();
$result = (bool) $wpdb->get_results( "DESCRIBE {$wpdb->posts}" );
$wpdb->suppress_errors( $suppress );

if ( $switch ) {
restore_current_blog();
add_action( 'switch_blog', 'wp_switch_roles_and_user', 1, 2 );
}

return $result;
}

/**
* Clean the blog cache
*
* @since 3.5.0
*
* @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, '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-id-cache' );
wp_cache_delete( $blog_id, 'blog_meta' );

/**
* Fires immediately after a site has been removed from the object cache.
*
* @since 4.6.0
*
* @param string $id Site ID as a numeric string.
* @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_sites_last_changed();

/**
* Fires after the blog details cache is cleared.
*
* @since 3.4.0
* @deprecated 4.9.0 Use {@see 'clean_site_cache'} instead.
*
* @param int $blog_id Blog ID.
*/
do_action_deprecated( 'refresh_blog_details', array( $blog_id ), '4.9.0', 'clean_site_cache' );
}

/**
* Adds metadata to a site.
*
* @since 5.1.0
*
* @param int $site_id Site ID.
* @param string $meta_key Metadata name.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param bool $unique Optional. Whether the same key should not be added.
* Default false.
* @return int|false Meta ID on success, false on failure.
*/
function add_site_meta( $site_id, $meta_key, $meta_value, $unique = false ) {
return add_metadata( 'blog', $site_id, $meta_key, $meta_value, $unique );
}

/**
* Removes metadata matching criteria from a site.
*
* You can match based on the key, or key and value. Removing based on key and
* value, will keep from removing duplicate metadata with the same key. It also
* allows removing all metadata matching key, if needed.
*
* @since 5.1.0
*
* @param int $site_id Site ID.
* @param string $meta_key Metadata name.
* @param mixed $meta_value Optional. Metadata value. If provided,
* rows will only be removed that match the value.
* Must be serializable if non-scalar. Default empty.
* @return bool True on success, false on failure.
*/
function delete_site_meta( $site_id, $meta_key, $meta_value = '' ) {
return delete_metadata( 'blog', $site_id, $meta_key, $meta_value );
}

/**
* Retrieves metadata for a site.
*
* @since 5.1.0
*
* @param int $site_id Site ID.
* @param string $key Optional. The meta key to retrieve. By default,
* returns data for all keys. Default empty.
* @param bool $single Optional. Whether to return a single value.
* This parameter has no effect if `$key` is not specified.
* Default false.
* @return mixed An array of values if `$single` is false.
* The value of meta data field if `$single` is true.
* False for an invalid `$site_id` (non-numeric, zero, or negative value).
* An empty array if a valid but non-existing site ID is passed and `$single` is false.
* An empty string if a valid but non-existing site ID is passed and `$single` is true.
*/
function get_site_meta( $site_id, $key = '', $single = false ) {
return get_metadata( 'blog', $site_id, $key, $single );
}

/**
* Updates metadata for a site.
*
* Use the $prev_value parameter to differentiate between meta fields with the
* same key and site ID.
*
* If the meta field for the site does not exist, it will be added.
*
* @since 5.1.0
*
* @param int $site_id Site ID.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param mixed $prev_value Optional. Previous value to check before updating.
* If specified, only update existing metadata entries with
* this value. Otherwise, update all entries. Default empty.
* @return int|bool Meta ID if the key didn't exist, true on successful update,
* false on failure or if the value passed to the function
* is the same as the one that is already in the database.
*/
function update_site_meta( $site_id, $meta_key, $meta_value, $prev_value = '' ) {
return update_metadata( 'blog', $site_id, $meta_key, $meta_value, $prev_value );
}

/**
* Deletes everything from site meta matching meta key.
*
* @since 5.1.0
*
* @param string $meta_key Metadata key to search for when deleting.
* @return bool Whether the site meta key was deleted from the database.
*/
function delete_site_meta_by_key( $meta_key ) {
return delete_metadata( 'blog', null, $meta_key, '', true );
}

/**
* Updates the count of sites for a network based on a changed site.
*
* @since 5.1.0
*
* @param WP_Site $new_site The site object that has been inserted, updated or deleted.
* @param WP_Site|null $old_site Optional. If $new_site has been updated, this must be the previous
* state of that site. Default null.
*/
function wp_maybe_update_network_site_counts_on_update( $new_site, $old_site = null ) {
if ( null === $old_site ) {
wp_maybe_update_network_site_counts( $new_site->network_id );
return;
}

if ( $new_site->network_id !== $old_site->network_id ) {
wp_maybe_update_network_site_counts( $new_site->network_id );
wp_maybe_update_network_site_counts( $old_site->network_id );
}
}

/**
* Triggers actions on site status updates.
*
* @since 5.1.0
*
* @param WP_Site $new_site The site object after the update.
* @param WP_Site|null $old_site Optional. If $new_site has been updated, this must be the previous
* state of that site. Default null.
*/
function wp_maybe_transition_site_statuses_on_update( $new_site, $old_site = null ) {
$site_id = $new_site->id;

// Use the default values for a site if no previous state is given.
if ( ! $old_site ) {
$old_site = new WP_Site( new stdClass() );
}

if ( $new_site->spam !== $old_site->spam ) {
if ( '1' === $new_site->spam ) {

/**
* Fires when the 'spam' status is added to a site.
*
* @since MU (3.0.0)
*
* @param int $site_id Site ID.
*/
do_action( 'make_spam_blog', $site_id );
} else {

/**
* Fires when the 'spam' status is removed from a site.
*
* @since MU (3.0.0)
*
* @param int $site_id Site ID.
*/
do_action( 'make_ham_blog', $site_id );
}
}

if ( $new_site->mature !== $old_site->mature ) {
if ( '1' === $new_site->mature ) {

/**
* Fires when the 'mature' status is added to a site.
*
* @since 3.1.0
*
* @param int $site_id Site ID.
*/
do_action( 'mature_blog', $site_id );
} else {

/**
* Fires when the 'mature' status is removed from a site.
*
* @since 3.1.0
*
* @param int $site_id Site ID.
*/
do_action( 'unmature_blog', $site_id );
}
}

if ( $new_site->archived !== $old_site->archived ) {
if ( '1' === $new_site->archived ) {

/**
* Fires when the 'archived' status is added to a site.
*
* @since MU (3.0.0)
*
* @param int $site_id Site ID.
*/
do_action( 'archive_blog', $site_id );
} else {

/**
* Fires when the 'archived' status is removed from a site.
*
* @since MU (3.0.0)
*
* @param int $site_id Site ID.
*/
do_action( 'unarchive_blog', $site_id );
}
}

if ( $new_site->deleted !== $old_site->deleted ) {
if ( '1' === $new_site->deleted ) {

/**
* Fires when the 'deleted' status is added to a site.
*
* @since 3.5.0
*
* @param int $site_id Site ID.
*/
do_action( 'make_delete_blog', $site_id );
} else {

/**
* Fires when the 'deleted' status is removed from a site.
*
* @since 3.5.0
*
* @param int $site_id Site ID.
*/
do_action( 'make_undelete_blog', $site_id );
}
}

if ( $new_site->public !== $old_site->public ) {

/**
* Fires after the current blog's 'public' setting is updated.
*
* @since MU (3.0.0)
*
* @param int $site_id Site ID.
* @param string $is_public Whether the site is public. A numeric string,
* for compatibility reasons. Accepts '1' or '0'.
*/
do_action( 'update_blog_public', $site_id, $new_site->public );
}
}

/**
* Cleans the necessary caches after specific site data has been updated.
*
* @since 5.1.0
*
* @param WP_Site $new_site The site object after the update.
* @param WP_Site $old_site The site object prior to the update.
*/
function wp_maybe_clean_new_site_cache_on_update( $new_site, $old_site ) {
if ( $old_site->domain !== $new_site->domain || $old_site->path !== $new_site->path ) {
clean_blog_cache( $new_site );
}
}

/**
* Updates the `blog_public` option for a given site ID.
*
* @since 5.1.0
*
* @param int $site_id Site ID.
* @param string $is_public Whether the site is public. A numeric string,
* for compatibility reasons. Accepts '1' or '0'.
*/
function wp_update_blog_public_option_on_site_update( $site_id, $is_public ) {

// Bail if the site's database tables do not exist (yet).
if ( ! wp_is_site_initialized( $site_id ) ) {
return;
}

update_blog_option( $site_id, 'blog_public', $is_public );
}

/**
* Sets the last changed time for the 'sites' cache group.
*
* @since 5.1.0
*/
function wp_cache_set_sites_last_changed() {
wp_cache_set_last_changed( 'sites' );
}

/**
* Aborts calls to site meta if it is not supported.
*
* @since 5.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param mixed $check Skip-value for whether to proceed site meta function execution.
* @return mixed Original value of $check, or false if site meta is not supported.
*/
function wp_check_site_meta_support_prefilter( $check ) {
if ( ! is_site_meta_supported() ) {
/* translators: %s: Database table name. */
_doing_it_wrong( __FUNCTION__, sprintf( __( 'The %s table is not installed. Please run the network database upgrade.' ), $GLOBALS['wpdb']->blogmeta ), '5.1.0' );
return false;
}

return $check;
}