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+<?php
+/**
+ * Multisite WordPress API
+ *
+ * @package WordPress
+ * @subpackage Multisite
+ * @since 3.0.0
+ */
+
+/**
+ * Gets the network's site and user counts.
+ *
+ * @since MU (3.0.0)
+ *
+ * @return int[] {
+ * Site and user count for the network.
+ *
+ * @type int $blogs Number of sites on the network.
+ * @type int $users Number of users on the network.
+ * }
+ */
+function get_sitestats() {
+ $stats = array(
+ 'blogs' => get_blog_count(),
+ 'users' => get_user_count(),
+ );
+
+ return $stats;
+}
+
+/**
+ * Gets one of a user's active blogs.
+ *
+ * Returns the user's primary blog, if they have one and
+ * it is active. If it's inactive, function returns another
+ * active blog of the user. If none are found, the user
+ * is added as a Subscriber to the Dashboard Blog and that blog
+ * is returned.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id The unique ID of the user
+ * @return WP_Site|void The blog object
+ */
+function get_active_blog_for_user( $user_id ) {
+ $blogs = get_blogs_of_user( $user_id );
+ if ( empty( $blogs ) ) {
+ return;
+ }
+
+ if ( ! is_multisite() ) {
+ return $blogs[ get_current_blog_id() ];
+ }
+
+ $primary_blog = get_user_meta( $user_id, 'primary_blog', true );
+ $first_blog = current( $blogs );
+ if ( false !== $primary_blog ) {
+ if ( ! isset( $blogs[ $primary_blog ] ) ) {
+ update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );
+ $primary = get_site( $first_blog->userblog_id );
+ } else {
+ $primary = get_site( $primary_blog );
+ }
+ } else {
+ // TODO: Review this call to add_user_to_blog too - to get here the user must have a role on this blog?
+ $result = add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' );
+
+ if ( ! is_wp_error( $result ) ) {
+ update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );
+ $primary = $first_blog;
+ }
+ }
+
+ if ( ( ! is_object( $primary ) ) || ( 1 == $primary->archived || 1 == $primary->spam || 1 == $primary->deleted ) ) {
+ $blogs = get_blogs_of_user( $user_id, true ); // If a user's primary blog is shut down, check their other blogs.
+ $ret = false;
+ if ( is_array( $blogs ) && count( $blogs ) > 0 ) {
+ foreach ( (array) $blogs as $blog_id => $blog ) {
+ if ( get_current_network_id() != $blog->site_id ) {
+ continue;
+ }
+ $details = get_site( $blog_id );
+ if ( is_object( $details ) && 0 == $details->archived && 0 == $details->spam && 0 == $details->deleted ) {
+ $ret = $details;
+ if ( get_user_meta( $user_id, 'primary_blog', true ) != $blog_id ) {
+ update_user_meta( $user_id, 'primary_blog', $blog_id );
+ }
+ if ( ! get_user_meta( $user_id, 'source_domain', true ) ) {
+ update_user_meta( $user_id, 'source_domain', $details->domain );
+ }
+ break;
+ }
+ }
+ } else {
+ return;
+ }
+ return $ret;
+ } else {
+ return $primary;
+ }
+}
+
+/**
+ * Gets the number of active sites on the installation.
+ *
+ * The count is cached and updated twice daily. This is not a live count.
+ *
+ * @since MU (3.0.0)
+ * @since 3.7.0 The `$network_id` parameter has been deprecated.
+ * @since 4.8.0 The `$network_id` parameter is now being used.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ * @return int Number of active sites on the network.
+ */
+function get_blog_count( $network_id = null ) {
+ return get_network_option( $network_id, 'blog_count' );
+}
+
+/**
+ * Gets a blog post from any site on the network.
+ *
+ * This function is similar to get_post(), except that it can retrieve a post
+ * from any site on the network, not just the current site.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $blog_id ID of the blog.
+ * @param int $post_id ID of the post being looked for.
+ * @return WP_Post|null WP_Post object on success, null on failure
+ */
+function get_blog_post( $blog_id, $post_id ) {
+ switch_to_blog( $blog_id );
+ $post = get_post( $post_id );
+ restore_current_blog();
+
+ return $post;
+}
+
+/**
+ * Adds a user to a blog, along with specifying the user's role.
+ *
+ * Use the {@see 'add_user_to_blog'} action to fire an event when users are added to a blog.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $blog_id ID of the blog the user is being added to.
+ * @param int $user_id ID of the user being added.
+ * @param string $role User role.
+ * @return true|WP_Error True on success or a WP_Error object if the user doesn't exist
+ * or could not be added.
+ */
+function add_user_to_blog( $blog_id, $user_id, $role ) {
+ switch_to_blog( $blog_id );
+
+ $user = get_userdata( $user_id );
+
+ if ( ! $user ) {
+ restore_current_blog();
+ return new WP_Error( 'user_does_not_exist', __( 'The requested user does not exist.' ) );
+ }
+
+ /**
+ * Filters whether a user should be added to a site.
+ *
+ * @since 4.9.0
+ *
+ * @param true|WP_Error $retval True if the user should be added to the site, error
+ * object otherwise.
+ * @param int $user_id User ID.
+ * @param string $role User role.
+ * @param int $blog_id Site ID.
+ */
+ $can_add_user = apply_filters( 'can_add_user_to_blog', true, $user_id, $role, $blog_id );
+
+ if ( true !== $can_add_user ) {
+ restore_current_blog();
+
+ if ( is_wp_error( $can_add_user ) ) {
+ return $can_add_user;
+ }
+
+ return new WP_Error( 'user_cannot_be_added', __( 'User cannot be added to this site.' ) );
+ }
+
+ if ( ! get_user_meta( $user_id, 'primary_blog', true ) ) {
+ update_user_meta( $user_id, 'primary_blog', $blog_id );
+ $site = get_site( $blog_id );
+ update_user_meta( $user_id, 'source_domain', $site->domain );
+ }
+
+ $user->set_role( $role );
+
+ /**
+ * Fires immediately after a user is added to a site.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ * @param string $role User role.
+ * @param int $blog_id Blog ID.
+ */
+ do_action( 'add_user_to_blog', $user_id, $role, $blog_id );
+
+ clean_user_cache( $user_id );
+ wp_cache_delete( $blog_id . '_user_count', 'blog-details' );
+
+ restore_current_blog();
+
+ return true;
+}
+
+/**
+ * Removes a user from a blog.
+ *
+ * Use the {@see 'remove_user_from_blog'} action to fire an event when
+ * users are removed from a blog.
+ *
+ * Accepts an optional `$reassign` parameter, if you want to
+ * reassign the user's blog posts to another user upon removal.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $user_id ID of the user being removed.
+ * @param int $blog_id Optional. ID of the blog the user is being removed from. Default 0.
+ * @param int $reassign Optional. ID of the user to whom to reassign posts. Default 0.
+ * @return true|WP_Error True on success or a WP_Error object if the user doesn't exist.
+ */
+function remove_user_from_blog( $user_id, $blog_id = 0, $reassign = 0 ) {
+ global $wpdb;
+
+ switch_to_blog( $blog_id );
+ $user_id = (int) $user_id;
+
+ /**
+ * Fires before a user is removed from a site.
+ *
+ * @since MU (3.0.0)
+ * @since 5.4.0 Added the `$reassign` parameter.
+ *
+ * @param int $user_id ID of the user being removed.
+ * @param int $blog_id ID of the blog the user is being removed from.
+ * @param int $reassign ID of the user to whom to reassign posts.
+ */
+ do_action( 'remove_user_from_blog', $user_id, $blog_id, $reassign );
+
+ /*
+ * If being removed from the primary blog, set a new primary
+ * if the user is assigned to multiple blogs.
+ */
+ $primary_blog = get_user_meta( $user_id, 'primary_blog', true );
+ if ( $primary_blog == $blog_id ) {
+ $new_id = '';
+ $new_domain = '';
+ $blogs = get_blogs_of_user( $user_id );
+ foreach ( (array) $blogs as $blog ) {
+ if ( $blog->userblog_id == $blog_id ) {
+ continue;
+ }
+ $new_id = $blog->userblog_id;
+ $new_domain = $blog->domain;
+ break;
+ }
+
+ update_user_meta( $user_id, 'primary_blog', $new_id );
+ update_user_meta( $user_id, 'source_domain', $new_domain );
+ }
+
+ $user = get_userdata( $user_id );
+ if ( ! $user ) {
+ restore_current_blog();
+ return new WP_Error( 'user_does_not_exist', __( 'That user does not exist.' ) );
+ }
+
+ $user->remove_all_caps();
+
+ $blogs = get_blogs_of_user( $user_id );
+ if ( count( $blogs ) === 0 ) {
+ update_user_meta( $user_id, 'primary_blog', '' );
+ update_user_meta( $user_id, 'source_domain', '' );
+ }
+
+ if ( $reassign ) {
+ $reassign = (int) $reassign;
+ $post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $user_id ) );
+ $link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $user_id ) );
+
+ if ( ! empty( $post_ids ) ) {
+ $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_author = %d WHERE post_author = %d", $reassign, $user_id ) );
+ array_walk( $post_ids, 'clean_post_cache' );
+ }
+
+ if ( ! empty( $link_ids ) ) {
+ $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->links SET link_owner = %d WHERE link_owner = %d", $reassign, $user_id ) );
+ array_walk( $link_ids, 'clean_bookmark_cache' );
+ }
+ }
+
+ clean_user_cache( $user_id );
+ restore_current_blog();
+
+ return true;
+}
+
+/**
+ * Gets the permalink for a post on another blog.
+ *
+ * @since MU (3.0.0) 1.0
+ *
+ * @param int $blog_id ID of the source blog.
+ * @param int $post_id ID of the desired post.
+ * @return string The post's permalink.
+ */
+function get_blog_permalink( $blog_id, $post_id ) {
+ switch_to_blog( $blog_id );
+ $link = get_permalink( $post_id );
+ restore_current_blog();
+
+ return $link;
+}
+
+/**
+ * Gets a blog's numeric ID from its URL.
+ *
+ * On a subdirectory installation like example.com/blog1/,
+ * $domain will be the root 'example.com' and $path the
+ * subdirectory '/blog1/'. With subdomains like blog1.example.com,
+ * $domain is 'blog1.example.com' and $path is '/'.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $domain Website domain.
+ * @param string $path Optional. Not required for subdomain installations. Default '/'.
+ * @return int 0 if no blog found, otherwise the ID of the matching blog.
+ */
+function get_blog_id_from_url( $domain, $path = '/' ) {
+ $domain = strtolower( $domain );
+ $path = strtolower( $path );
+ $id = wp_cache_get( md5( $domain . $path ), 'blog-id-cache' );
+
+ if ( -1 == $id ) { // Blog does not exist.
+ return 0;
+ } elseif ( $id ) {
+ return (int) $id;
+ }
+
+ $args = array(
+ 'domain' => $domain,
+ 'path' => $path,
+ 'fields' => 'ids',
+ 'number' => 1,
+ 'update_site_meta_cache' => false,
+ );
+ $result = get_sites( $args );
+ $id = array_shift( $result );
+
+ if ( ! $id ) {
+ wp_cache_set( md5( $domain . $path ), -1, 'blog-id-cache' );
+ return 0;
+ }
+
+ wp_cache_set( md5( $domain . $path ), $id, 'blog-id-cache' );
+
+ return $id;
+}
+
+//
+// Admin functions.
+//
+
+/**
+ * Checks an email address against a list of banned domains.
+ *
+ * This function checks against the Banned Email Domains list
+ * at wp-admin/network/settings.php. The check is only run on
+ * self-registrations; user creation at wp-admin/network/users.php
+ * bypasses this check.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $user_email The email provided by the user at registration.
+ * @return bool True when the email address is banned, false otherwise.
+ */
+function is_email_address_unsafe( $user_email ) {
+ $banned_names = get_site_option( 'banned_email_domains' );
+ if ( $banned_names && ! is_array( $banned_names ) ) {
+ $banned_names = explode( "\n", $banned_names );
+ }
+
+ $is_email_address_unsafe = false;
+
+ if ( $banned_names && is_array( $banned_names ) && false !== strpos( $user_email, '@', 1 ) ) {
+ $banned_names = array_map( 'strtolower', $banned_names );
+ $normalized_email = strtolower( $user_email );
+
+ list( $email_local_part, $email_domain ) = explode( '@', $normalized_email );
+
+ foreach ( $banned_names as $banned_domain ) {
+ if ( ! $banned_domain ) {
+ continue;
+ }
+
+ if ( $email_domain === $banned_domain ) {
+ $is_email_address_unsafe = true;
+ break;
+ }
+
+ if ( str_ends_with( $normalized_email, ".$banned_domain" ) ) {
+ $is_email_address_unsafe = true;
+ break;
+ }
+ }
+ }
+
+ /**
+ * Filters whether an email address is unsafe.
+ *
+ * @since 3.5.0
+ *
+ * @param bool $is_email_address_unsafe Whether the email address is "unsafe". Default false.
+ * @param string $user_email User email address.
+ */
+ return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email );
+}
+
+/**
+ * Sanitizes and validates data required for a user sign-up.
+ *
+ * Verifies the validity and uniqueness of user names and user email addresses,
+ * and checks email addresses against allowed and disallowed domains provided by
+ * administrators.
+ *
+ * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up
+ * process. The value $result, which is passed to the hook, contains both the user-provided
+ * info and the error messages created by the function. {@see 'wpmu_validate_user_signup'}
+ * allows you to process the data in any way you'd like, and unset the relevant errors if
+ * necessary.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $user_name The login name provided by the user.
+ * @param string $user_email The email provided by the user.
+ * @return array {
+ * The array of user name, email, and the error messages.
+ *
+ * @type string $user_name Sanitized and unique username.
+ * @type string $orig_username Original username.
+ * @type string $user_email User email address.
+ * @type WP_Error $errors WP_Error object containing any errors found.
+ * }
+ */
+function wpmu_validate_user_signup( $user_name, $user_email ) {
+ global $wpdb;
+
+ $errors = new WP_Error();
+
+ $orig_username = $user_name;
+ $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );
+
+ if ( $user_name != $orig_username || preg_match( '/[^a-z0-9]/', $user_name ) ) {
+ $errors->add( 'user_name', __( 'Usernames can only contain lowercase letters (a-z) and numbers.' ) );
+ $user_name = $orig_username;
+ }
+
+ $user_email = sanitize_email( $user_email );
+
+ if ( empty( $user_name ) ) {
+ $errors->add( 'user_name', __( 'Please enter a username.' ) );
+ }
+
+ $illegal_names = get_site_option( 'illegal_names' );
+ if ( ! is_array( $illegal_names ) ) {
+ $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
+ add_site_option( 'illegal_names', $illegal_names );
+ }
+ if ( in_array( $user_name, $illegal_names, true ) ) {
+ $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) );
+ }
+
+ /** This filter is documented in wp-includes/user.php */
+ $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );
+
+ if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ), true ) ) {
+ $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) );
+ }
+
+ if ( ! is_email( $user_email ) ) {
+ $errors->add( 'user_email', __( 'Please enter a valid email address.' ) );
+ } elseif ( is_email_address_unsafe( $user_email ) ) {
+ $errors->add( 'user_email', __( 'You cannot use that email address to signup. There are problems with them blocking some emails from WordPress. Please use another email provider.' ) );
+ }
+
+ if ( strlen( $user_name ) < 4 ) {
+ $errors->add( 'user_name', __( 'Username must be at least 4 characters.' ) );
+ }
+
+ if ( strlen( $user_name ) > 60 ) {
+ $errors->add( 'user_name', __( 'Username may not be longer than 60 characters.' ) );
+ }
+
+ // All numeric?
+ if ( preg_match( '/^[0-9]*$/', $user_name ) ) {
+ $errors->add( 'user_name', __( 'Sorry, usernames must have letters too!' ) );
+ }
+
+ $limited_email_domains = get_site_option( 'limited_email_domains' );
+ if ( is_array( $limited_email_domains ) && ! empty( $limited_email_domains ) ) {
+ $limited_email_domains = array_map( 'strtolower', $limited_email_domains );
+ $emaildomain = strtolower( substr( $user_email, 1 + strpos( $user_email, '@' ) ) );
+ if ( ! in_array( $emaildomain, $limited_email_domains, true ) ) {
+ $errors->add( 'user_email', __( 'Sorry, that email address is not allowed!' ) );
+ }
+ }
+
+ // Check if the username has been used already.
+ if ( username_exists( $user_name ) ) {
+ $errors->add( 'user_name', __( 'Sorry, that username already exists!' ) );
+ }
+
+ // Check if the email address has been used already.
+ if ( email_exists( $user_email ) ) {
+ $errors->add(
+ 'user_email',
+ sprintf(
+ /* translators: %s: Link to the login page. */
+ __( '<strong>Error:</strong> This email address is already registered. <a href="%s">Log in</a> with this address or choose another one.' ),
+ wp_login_url()
+ )
+ );
+ }
+
+ // Has someone already signed up for this username?
+ $signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE user_login = %s", $user_name ) );
+ if ( $signup instanceof stdClass ) {
+ $registered_at = mysql2date( 'U', $signup->registered );
+ $now = time();
+ $diff = $now - $registered_at;
+ // If registered more than two days ago, cancel registration and let this signup go through.
+ if ( $diff > 2 * DAY_IN_SECONDS ) {
+ $wpdb->delete( $wpdb->signups, array( 'user_login' => $user_name ) );
+ } else {
+ $errors->add( 'user_name', __( 'That username is currently reserved but may be available in a couple of days.' ) );
+ }
+ }
+
+ $signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE user_email = %s", $user_email ) );
+ if ( $signup instanceof stdClass ) {
+ $diff = time() - mysql2date( 'U', $signup->registered );
+ // If registered more than two days ago, cancel registration and let this signup go through.
+ if ( $diff > 2 * DAY_IN_SECONDS ) {
+ $wpdb->delete( $wpdb->signups, array( 'user_email' => $user_email ) );
+ } else {
+ $errors->add( 'user_email', __( 'That email address has already been used. Please check your inbox for an activation email. It will become available in a couple of days if you do nothing.' ) );
+ }
+ }
+
+ $result = array(
+ 'user_name' => $user_name,
+ 'orig_username' => $orig_username,
+ 'user_email' => $user_email,
+ 'errors' => $errors,
+ );
+
+ /**
+ * Filters the validated user registration details.
+ *
+ * This does not allow you to override the username or email of the user during
+ * registration. The values are solely used for validation and error handling.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param array $result {
+ * The array of user name, email, and the error messages.
+ *
+ * @type string $user_name Sanitized and unique username.
+ * @type string $orig_username Original username.
+ * @type string $user_email User email address.
+ * @type WP_Error $errors WP_Error object containing any errors found.
+ * }
+ */
+ return apply_filters( 'wpmu_validate_user_signup', $result );
+}
+
+/**
+ * Processes new site registrations.
+ *
+ * Checks the data provided by the user during blog signup. Verifies
+ * the validity and uniqueness of blog paths and domains.
+ *
+ * This function prevents the current user from registering a new site
+ * with a blogname equivalent to another user's login name. Passing the
+ * $user parameter to the function, where $user is the other user, is
+ * effectively an override of this limitation.
+ *
+ * Filter {@see 'wpmu_validate_blog_signup'} if you want to modify
+ * the way that WordPress validates new site signups.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ * @global string $domain
+ *
+ * @param string $blogname The site name provided by the user. Must be unique.
+ * @param string $blog_title The site title provided by the user.
+ * @param WP_User|string $user Optional. The user object to check against the new site name.
+ * Default empty string.
+ * @return array {
+ * Array of domain, path, site name, site title, user and error messages.
+ *
+ * @type string $domain Domain for the site.
+ * @type string $path Path for the site. Used in subdirectory installations.
+ * @type string $blogname The unique site name (slug).
+ * @type string $blog_title Blog title.
+ * @type string|WP_User $user By default, an empty string. A user object if provided.
+ * @type WP_Error $errors WP_Error containing any errors found.
+ * }
+ */
+function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) {
+ global $wpdb, $domain;
+
+ $current_network = get_network();
+ $base = $current_network->path;
+
+ $blog_title = strip_tags( $blog_title );
+
+ $errors = new WP_Error();
+ $illegal_names = get_site_option( 'illegal_names' );
+ if ( false == $illegal_names ) {
+ $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
+ add_site_option( 'illegal_names', $illegal_names );
+ }
+
+ /*
+ * On sub dir installations, some names are so illegal, only a filter can
+ * spring them from jail.
+ */
+ if ( ! is_subdomain_install() ) {
+ $illegal_names = array_merge( $illegal_names, get_subdirectory_reserved_names() );
+ }
+
+ if ( empty( $blogname ) ) {
+ $errors->add( 'blogname', __( 'Please enter a site name.' ) );
+ }
+
+ if ( preg_match( '/[^a-z0-9]+/', $blogname ) ) {
+ $errors->add( 'blogname', __( 'Site names can only contain lowercase letters (a-z) and numbers.' ) );
+ }
+
+ if ( in_array( $blogname, $illegal_names, true ) ) {
+ $errors->add( 'blogname', __( 'That name is not allowed.' ) );
+ }
+
+ /**
+ * Filters the minimum site name length required when validating a site signup.
+ *
+ * @since 4.8.0
+ *
+ * @param int $length The minimum site name length. Default 4.
+ */
+ $minimum_site_name_length = apply_filters( 'minimum_site_name_length', 4 );
+
+ if ( strlen( $blogname ) < $minimum_site_name_length ) {
+ /* translators: %s: Minimum site name length. */
+ $errors->add( 'blogname', sprintf( _n( 'Site name must be at least %s character.', 'Site name must be at least %s characters.', $minimum_site_name_length ), number_format_i18n( $minimum_site_name_length ) ) );
+ }
+
+ // Do not allow users to create a site that conflicts with a page on the main blog.
+ if ( ! is_subdomain_install() && $wpdb->get_var( $wpdb->prepare( 'SELECT post_name FROM ' . $wpdb->get_blog_prefix( $current_network->site_id ) . "posts WHERE post_type = 'page' AND post_name = %s", $blogname ) ) ) {
+ $errors->add( 'blogname', __( 'Sorry, you may not use that site name.' ) );
+ }
+
+ // All numeric?
+ if ( preg_match( '/^[0-9]*$/', $blogname ) ) {
+ $errors->add( 'blogname', __( 'Sorry, site names must have letters too!' ) );
+ }
+
+ /**
+ * Filters the new site name during registration.
+ *
+ * The name is the site's subdomain or the site's subdirectory
+ * path depending on the network settings.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $blogname Site name.
+ */
+ $blogname = apply_filters( 'newblogname', $blogname );
+
+ $blog_title = wp_unslash( $blog_title );
+
+ if ( empty( $blog_title ) ) {
+ $errors->add( 'blog_title', __( 'Please enter a site title.' ) );
+ }
+
+ // Check if the domain/path has been used already.
+ if ( is_subdomain_install() ) {
+ $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain );
+ $path = $base;
+ } else {
+ $mydomain = $domain;
+ $path = $base . $blogname . '/';
+ }
+ if ( domain_exists( $mydomain, $path, $current_network->id ) ) {
+ $errors->add( 'blogname', __( 'Sorry, that site already exists!' ) );
+ }
+
+ /*
+ * Do not allow users to create a site that matches an existing user's login name,
+ * unless it's the user's own username.
+ */
+ if ( username_exists( $blogname ) ) {
+ if ( ! is_object( $user ) || ( is_object( $user ) && ( $user->user_login != $blogname ) ) ) {
+ $errors->add( 'blogname', __( 'Sorry, that site is reserved!' ) );
+ }
+ }
+
+ /*
+ * Has someone already signed up for this domain?
+ * TODO: Check email too?
+ */
+ $signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE domain = %s AND path = %s", $mydomain, $path ) );
+ if ( $signup instanceof stdClass ) {
+ $diff = time() - mysql2date( 'U', $signup->registered );
+ // If registered more than two days ago, cancel registration and let this signup go through.
+ if ( $diff > 2 * DAY_IN_SECONDS ) {
+ $wpdb->delete(
+ $wpdb->signups,
+ array(
+ 'domain' => $mydomain,
+ 'path' => $path,
+ )
+ );
+ } else {
+ $errors->add( 'blogname', __( 'That site is currently reserved but may be available in a couple days.' ) );
+ }
+ }
+
+ $result = array(
+ 'domain' => $mydomain,
+ 'path' => $path,
+ 'blogname' => $blogname,
+ 'blog_title' => $blog_title,
+ 'user' => $user,
+ 'errors' => $errors,
+ );
+
+ /**
+ * Filters site details and error messages following registration.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param array $result {
+ * Array of domain, path, site name, site title, user and error messages.
+ *
+ * @type string $domain Domain for the site.
+ * @type string $path Path for the site. Used in subdirectory installations.
+ * @type string $blogname The unique site name (slug).
+ * @type string $blog_title Site title.
+ * @type string|WP_User $user By default, an empty string. A user object if provided.
+ * @type WP_Error $errors WP_Error containing any errors found.
+ * }
+ */
+ return apply_filters( 'wpmu_validate_blog_signup', $result );
+}
+
+/**
+ * Records site signup information for future activation.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $domain The requested domain.
+ * @param string $path The requested path.
+ * @param string $title The requested site title.
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param array $meta Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+function wpmu_signup_blog( $domain, $path, $title, $user, $user_email, $meta = array() ) {
+ global $wpdb;
+
+ $key = substr( md5( time() . wp_rand() . $domain ), 0, 16 );
+
+ /**
+ * Filters the metadata for a site signup.
+ *
+ * The metadata will be serialized prior to storing it in the database.
+ *
+ * @since 4.8.0
+ *
+ * @param array $meta Signup meta data. Default empty array.
+ * @param string $domain The requested domain.
+ * @param string $path The requested path.
+ * @param string $title The requested site title.
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The user's activation key.
+ */
+ $meta = apply_filters( 'signup_site_meta', $meta, $domain, $path, $title, $user, $user_email, $key );
+
+ $wpdb->insert(
+ $wpdb->signups,
+ array(
+ 'domain' => $domain,
+ 'path' => $path,
+ 'title' => $title,
+ 'user_login' => $user,
+ 'user_email' => $user_email,
+ 'registered' => current_time( 'mysql', true ),
+ 'activation_key' => $key,
+ 'meta' => serialize( $meta ),
+ )
+ );
+
+ /**
+ * Fires after site signup information has been written to the database.
+ *
+ * @since 4.4.0
+ *
+ * @param string $domain The requested domain.
+ * @param string $path The requested path.
+ * @param string $title The requested site title.
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The user's activation key.
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ do_action( 'after_signup_site', $domain, $path, $title, $user, $user_email, $key, $meta );
+}
+
+/**
+ * Records user signup information for future activation.
+ *
+ * This function is used when user registration is open but
+ * new site registration is not.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param array $meta Optional. Signup meta data. Default empty array.
+ */
+function wpmu_signup_user( $user, $user_email, $meta = array() ) {
+ global $wpdb;
+
+ // Format data.
+ $user = preg_replace( '/\s+/', '', sanitize_user( $user, true ) );
+ $user_email = sanitize_email( $user_email );
+ $key = substr( md5( time() . wp_rand() . $user_email ), 0, 16 );
+
+ /**
+ * Filters the metadata for a user signup.
+ *
+ * The metadata will be serialized prior to storing it in the database.
+ *
+ * @since 4.8.0
+ *
+ * @param array $meta Signup meta data. Default empty array.
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The user's activation key.
+ */
+ $meta = apply_filters( 'signup_user_meta', $meta, $user, $user_email, $key );
+
+ $wpdb->insert(
+ $wpdb->signups,
+ array(
+ 'domain' => '',
+ 'path' => '',
+ 'title' => '',
+ 'user_login' => $user,
+ 'user_email' => $user_email,
+ 'registered' => current_time( 'mysql', true ),
+ 'activation_key' => $key,
+ 'meta' => serialize( $meta ),
+ )
+ );
+
+ /**
+ * Fires after a user's signup information has been written to the database.
+ *
+ * @since 4.4.0
+ *
+ * @param string $user The user's requested login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The user's activation key.
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ do_action( 'after_signup_user', $user, $user_email, $key, $meta );
+}
+
+/**
+ * Sends a confirmation request email to a user when they sign up for a new site. The new site will not become active
+ * until the confirmation link is clicked.
+ *
+ * This is the notification function used when site registration
+ * is enabled.
+ *
+ * Filter {@see 'wpmu_signup_blog_notification'} to bypass this function or
+ * replace it with your own notification behavior.
+ *
+ * Filter {@see 'wpmu_signup_blog_notification_email'} and
+ * {@see 'wpmu_signup_blog_notification_subject'} to change the content
+ * and subject line of the email sent to newly registered users.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $domain The new blog domain.
+ * @param string $path The new blog path.
+ * @param string $title The site title.
+ * @param string $user_login The user's login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The activation key created in wpmu_signup_blog().
+ * @param array $meta Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
+ * @return bool
+ */
+function wpmu_signup_blog_notification( $domain, $path, $title, $user_login, $user_email, $key, $meta = array() ) {
+ /**
+ * Filters whether to bypass the new site email notification.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string|false $domain Site domain, or false to prevent the email from sending.
+ * @param string $path Site path.
+ * @param string $title Site title.
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_blog().
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ if ( ! apply_filters( 'wpmu_signup_blog_notification', $domain, $path, $title, $user_login, $user_email, $key, $meta ) ) {
+ return false;
+ }
+
+ // Send email with activation link.
+ if ( ! is_subdomain_install() || get_current_network_id() != 1 ) {
+ $activate_url = network_site_url( "wp-activate.php?key=$key" );
+ } else {
+ $activate_url = "http://{$domain}{$path}wp-activate.php?key=$key"; // @todo Use *_url() API.
+ }
+
+ $activate_url = esc_url( $activate_url );
+
+ $admin_email = get_site_option( 'admin_email' );
+
+ if ( '' === $admin_email ) {
+ $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST );
+ }
+
+ $from_name = ( '' !== get_site_option( 'site_name' ) ) ? esc_html( get_site_option( 'site_name' ) ) : 'WordPress';
+ $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n";
+
+ $user = get_user_by( 'login', $user_login );
+ $switched_locale = $user && switch_to_user_locale( $user->ID );
+
+ $message = sprintf(
+ /**
+ * Filters the message content of the new blog notification email.
+ *
+ * Content should be formatted for transmission via wp_mail().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $content Content of the notification email.
+ * @param string $domain Site domain.
+ * @param string $path Site path.
+ * @param string $title Site title.
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_blog().
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ apply_filters(
+ 'wpmu_signup_blog_notification_email',
+ /* translators: New site notification email. 1: Activation URL, 2: New site URL. */
+ __( "To activate your site, please click the following link:\n\n%1\$s\n\nAfter you activate, you will receive *another email* with your login.\n\nAfter you activate, you can visit your site here:\n\n%2\$s" ),
+ $domain,
+ $path,
+ $title,
+ $user_login,
+ $user_email,
+ $key,
+ $meta
+ ),
+ $activate_url,
+ esc_url( "http://{$domain}{$path}" ),
+ $key
+ );
+
+ $subject = sprintf(
+ /**
+ * Filters the subject of the new blog notification email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $subject Subject of the notification email.
+ * @param string $domain Site domain.
+ * @param string $path Site path.
+ * @param string $title Site title.
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_blog().
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ apply_filters(
+ 'wpmu_signup_blog_notification_subject',
+ /* translators: New site notification email subject. 1: Network title, 2: New site URL. */
+ _x( '[%1$s] Activate %2$s', 'New site notification email subject' ),
+ $domain,
+ $path,
+ $title,
+ $user_login,
+ $user_email,
+ $key,
+ $meta
+ ),
+ $from_name,
+ esc_url( 'http://' . $domain . $path )
+ );
+
+ wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+
+ return true;
+}
+
+/**
+ * Sends a confirmation request email to a user when they sign up for a new user account (without signing up for a site
+ * at the same time). The user account will not become active until the confirmation link is clicked.
+ *
+ * This is the notification function used when no new site has
+ * been requested.
+ *
+ * Filter {@see 'wpmu_signup_user_notification'} to bypass this function or
+ * replace it with your own notification behavior.
+ *
+ * Filter {@see 'wpmu_signup_user_notification_email'} and
+ * {@see 'wpmu_signup_user_notification_subject'} to change the content
+ * and subject line of the email sent to newly registered users.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $user_login The user's login name.
+ * @param string $user_email The user's email address.
+ * @param string $key The activation key created in wpmu_signup_user()
+ * @param array $meta Optional. Signup meta data. Default empty array.
+ * @return bool
+ */
+function wpmu_signup_user_notification( $user_login, $user_email, $key, $meta = array() ) {
+ /**
+ * Filters whether to bypass the email notification for new user sign-up.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_user().
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ if ( ! apply_filters( 'wpmu_signup_user_notification', $user_login, $user_email, $key, $meta ) ) {
+ return false;
+ }
+
+ $user = get_user_by( 'login', $user_login );
+ $switched_locale = $user && switch_to_user_locale( $user->ID );
+
+ // Send email with activation link.
+ $admin_email = get_site_option( 'admin_email' );
+
+ if ( '' === $admin_email ) {
+ $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST );
+ }
+
+ $from_name = ( '' !== get_site_option( 'site_name' ) ) ? esc_html( get_site_option( 'site_name' ) ) : 'WordPress';
+ $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n";
+ $message = sprintf(
+ /**
+ * Filters the content of the notification email for new user sign-up.
+ *
+ * Content should be formatted for transmission via wp_mail().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $content Content of the notification email.
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_user().
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ apply_filters(
+ 'wpmu_signup_user_notification_email',
+ /* translators: New user notification email. %s: Activation URL. */
+ __( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login." ),
+ $user_login,
+ $user_email,
+ $key,
+ $meta
+ ),
+ site_url( "wp-activate.php?key=$key" )
+ );
+
+ $subject = sprintf(
+ /**
+ * Filters the subject of the notification email of new user signup.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $subject Subject of the notification email.
+ * @param string $user_login User login name.
+ * @param string $user_email User email address.
+ * @param string $key Activation key created in wpmu_signup_user().
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ apply_filters(
+ 'wpmu_signup_user_notification_subject',
+ /* translators: New user notification email subject. 1: Network title, 2: New user login. */
+ _x( '[%1$s] Activate %2$s', 'New user notification email subject' ),
+ $user_login,
+ $user_email,
+ $key,
+ $meta
+ ),
+ $from_name,
+ $user_login
+ );
+
+ wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+
+ return true;
+}
+
+/**
+ * Activates a signup.
+ *
+ * Hook to {@see 'wpmu_activate_user'} or {@see 'wpmu_activate_blog'} for events
+ * that should happen only when users or sites are self-created (since
+ * those actions are not called when users and sites are created
+ * by a Super Admin).
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $key The activation key provided to the user.
+ * @return array|WP_Error An array containing information about the activated user and/or blog.
+ */
+function wpmu_activate_signup( $key ) {
+ global $wpdb;
+
+ $signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE activation_key = %s", $key ) );
+
+ if ( empty( $signup ) ) {
+ return new WP_Error( 'invalid_key', __( 'Invalid activation key.' ) );
+ }
+
+ if ( $signup->active ) {
+ if ( empty( $signup->domain ) ) {
+ return new WP_Error( 'already_active', __( 'The user is already active.' ), $signup );
+ } else {
+ return new WP_Error( 'already_active', __( 'The site is already active.' ), $signup );
+ }
+ }
+
+ $meta = maybe_unserialize( $signup->meta );
+ $password = wp_generate_password( 12, false );
+
+ $user_id = username_exists( $signup->user_login );
+
+ if ( ! $user_id ) {
+ $user_id = wpmu_create_user( $signup->user_login, $password, $signup->user_email );
+ } else {
+ $user_already_exists = true;
+ }
+
+ if ( ! $user_id ) {
+ return new WP_Error( 'create_user', __( 'Could not create user' ), $signup );
+ }
+
+ $now = current_time( 'mysql', true );
+
+ if ( empty( $signup->domain ) ) {
+ $wpdb->update(
+ $wpdb->signups,
+ array(
+ 'active' => 1,
+ 'activated' => $now,
+ ),
+ array( 'activation_key' => $key )
+ );
+
+ if ( isset( $user_already_exists ) ) {
+ return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup );
+ }
+
+ /**
+ * Fires immediately after a new user is activated.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ * @param string $password User password.
+ * @param array $meta Signup meta data.
+ */
+ do_action( 'wpmu_activate_user', $user_id, $password, $meta );
+
+ return array(
+ 'user_id' => $user_id,
+ 'password' => $password,
+ 'meta' => $meta,
+ );
+ }
+
+ $blog_id = wpmu_create_blog( $signup->domain, $signup->path, $signup->title, $user_id, $meta, get_current_network_id() );
+
+ // TODO: What to do if we create a user but cannot create a blog?
+ if ( is_wp_error( $blog_id ) ) {
+ /*
+ * If blog is taken, that means a previous attempt to activate this blog
+ * failed in between creating the blog and setting the activation flag.
+ * Let's just set the active flag and instruct the user to reset their password.
+ */
+ if ( 'blog_taken' === $blog_id->get_error_code() ) {
+ $blog_id->add_data( $signup );
+ $wpdb->update(
+ $wpdb->signups,
+ array(
+ 'active' => 1,
+ 'activated' => $now,
+ ),
+ array( 'activation_key' => $key )
+ );
+ }
+ return $blog_id;
+ }
+
+ $wpdb->update(
+ $wpdb->signups,
+ array(
+ 'active' => 1,
+ 'activated' => $now,
+ ),
+ array( 'activation_key' => $key )
+ );
+
+ /**
+ * Fires immediately after a site is activated.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $blog_id Blog ID.
+ * @param int $user_id User ID.
+ * @param string $password User password.
+ * @param string $signup_title Site title.
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ do_action( 'wpmu_activate_blog', $blog_id, $user_id, $password, $signup->title, $meta );
+
+ return array(
+ 'blog_id' => $blog_id,
+ 'user_id' => $user_id,
+ 'password' => $password,
+ 'title' => $signup->title,
+ 'meta' => $meta,
+ );
+}
+
+/**
+ * Deletes an associated signup entry when a user is deleted from the database.
+ *
+ * @since 5.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $id ID of the user to delete.
+ * @param int|null $reassign ID of the user to reassign posts and links to.
+ * @param WP_User $user User object.
+ */
+function wp_delete_signup_on_user_delete( $id, $reassign, $user ) {
+ global $wpdb;
+
+ $wpdb->delete( $wpdb->signups, array( 'user_login' => $user->user_login ) );
+}
+
+/**
+ * Creates a user.
+ *
+ * This function runs when a user self-registers as well as when
+ * a Super Admin creates a new user. Hook to {@see 'wpmu_new_user'} for events
+ * that should affect all new users, but only on Multisite (otherwise
+ * use {@see 'user_register'}).
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $user_name The new user's login name.
+ * @param string $password The new user's password.
+ * @param string $email The new user's email address.
+ * @return int|false Returns false on failure, or int $user_id on success.
+ */
+function wpmu_create_user( $user_name, $password, $email ) {
+ $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );
+
+ $user_id = wp_create_user( $user_name, $password, $email );
+ if ( is_wp_error( $user_id ) ) {
+ return false;
+ }
+
+ // Newly created users have no roles or caps until they are added to a blog.
+ delete_user_option( $user_id, 'capabilities' );
+ delete_user_option( $user_id, 'user_level' );
+
+ /**
+ * Fires immediately after a new user is created.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ */
+ do_action( 'wpmu_new_user', $user_id );
+
+ return $user_id;
+}
+
+/**
+ * Creates a site.
+ *
+ * This function runs when a user self-registers a new site as well
+ * as when a Super Admin creates a new site. Hook to {@see 'wpmu_new_blog'}
+ * for events that should affect all new sites.
+ *
+ * On subdirectory installations, $domain is the same as the main site's
+ * domain, and the path is the subdirectory name (eg 'example.com'
+ * and '/blog1/'). On subdomain installations, $domain is the new subdomain +
+ * root domain (eg 'blog1.example.com'), and $path is '/'.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $domain The new site's domain.
+ * @param string $path The new site's path.
+ * @param string $title The new site's title.
+ * @param int $user_id The user ID of the new site's admin.
+ * @param array $options Optional. Array of key=>value pairs used to set initial site options.
+ * If valid status keys are included ('public', 'archived', 'mature',
+ * 'spam', 'deleted', or 'lang_id') the given site status(es) will be
+ * updated. Otherwise, keys and values will be used to set options for
+ * the new site. Default empty array.
+ * @param int $network_id Optional. Network ID. Only relevant on multi-network installations.
+ * Default 1.
+ * @return int|WP_Error Returns WP_Error object on failure, the new site ID on success.
+ */
+function wpmu_create_blog( $domain, $path, $title, $user_id, $options = array(), $network_id = 1 ) {
+ $defaults = array(
+ 'public' => 0,
+ );
+ $options = wp_parse_args( $options, $defaults );
+
+ $title = strip_tags( $title );
+ $user_id = (int) $user_id;
+
+ // Check if the domain has been used already. We should return an error message.
+ if ( domain_exists( $domain, $path, $network_id ) ) {
+ return new WP_Error( 'blog_taken', __( 'Sorry, that site already exists!' ) );
+ }
+
+ if ( ! wp_installing() ) {
+ wp_installing( true );
+ }
+
+ $allowed_data_fields = array( 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' );
+
+ $site_data = array_merge(
+ array(
+ 'domain' => $domain,
+ 'path' => $path,
+ 'network_id' => $network_id,
+ ),
+ array_intersect_key( $options, array_flip( $allowed_data_fields ) )
+ );
+
+ // Data to pass to wp_initialize_site().
+ $site_initialization_data = array(
+ 'title' => $title,
+ 'user_id' => $user_id,
+ 'options' => array_diff_key( $options, array_flip( $allowed_data_fields ) ),
+ );
+
+ $blog_id = wp_insert_site( array_merge( $site_data, $site_initialization_data ) );
+
+ if ( is_wp_error( $blog_id ) ) {
+ return $blog_id;
+ }
+
+ wp_cache_set_sites_last_changed();
+
+ return $blog_id;
+}
+
+/**
+ * Notifies the network admin that a new site has been activated.
+ *
+ * Filter {@see 'newblog_notify_siteadmin'} to change the content of
+ * the notification email.
+ *
+ * @since MU (3.0.0)
+ * @since 5.1.0 $blog_id now supports input from the {@see 'wp_initialize_site'} action.
+ *
+ * @param WP_Site|int $blog_id The new site's object or ID.
+ * @param string $deprecated Not used.
+ * @return bool
+ */
+function newblog_notify_siteadmin( $blog_id, $deprecated = '' ) {
+ if ( is_object( $blog_id ) ) {
+ $blog_id = $blog_id->blog_id;
+ }
+
+ if ( 'yes' !== get_site_option( 'registrationnotification' ) ) {
+ return false;
+ }
+
+ $email = get_site_option( 'admin_email' );
+
+ if ( is_email( $email ) == false ) {
+ return false;
+ }
+
+ $options_site_url = esc_url( network_admin_url( 'settings.php' ) );
+
+ switch_to_blog( $blog_id );
+ $blogname = get_option( 'blogname' );
+ $siteurl = site_url();
+ restore_current_blog();
+
+ $msg = sprintf(
+ /* translators: New site notification email. 1: Site URL, 2: User IP address, 3: URL to Network Settings screen. */
+ __(
+ 'New Site: %1$s
+URL: %2$s
+Remote IP address: %3$s
+
+Disable these notifications: %4$s'
+ ),
+ $blogname,
+ $siteurl,
+ wp_unslash( $_SERVER['REMOTE_ADDR'] ),
+ $options_site_url
+ );
+ /**
+ * Filters the message body of the new site activation email sent
+ * to the network administrator.
+ *
+ * @since MU (3.0.0)
+ * @since 5.4.0 The `$blog_id` parameter was added.
+ *
+ * @param string $msg Email body.
+ * @param int|string $blog_id The new site's ID as an integer or numeric string.
+ */
+ $msg = apply_filters( 'newblog_notify_siteadmin', $msg, $blog_id );
+
+ /* translators: New site notification email subject. %s: New site URL. */
+ wp_mail( $email, sprintf( __( 'New Site Registration: %s' ), $siteurl ), $msg );
+
+ return true;
+}
+
+/**
+ * Notifies the network admin that a new user has been activated.
+ *
+ * Filter {@see 'newuser_notify_siteadmin'} to change the content of
+ * the notification email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id The new user's ID.
+ * @return bool
+ */
+function newuser_notify_siteadmin( $user_id ) {
+ if ( 'yes' !== get_site_option( 'registrationnotification' ) ) {
+ return false;
+ }
+
+ $email = get_site_option( 'admin_email' );
+
+ if ( is_email( $email ) == false ) {
+ return false;
+ }
+
+ $user = get_userdata( $user_id );
+
+ $options_site_url = esc_url( network_admin_url( 'settings.php' ) );
+
+ $msg = sprintf(
+ /* translators: New user notification email. 1: User login, 2: User IP address, 3: URL to Network Settings screen. */
+ __(
+ 'New User: %1$s
+Remote IP address: %2$s
+
+Disable these notifications: %3$s'
+ ),
+ $user->user_login,
+ wp_unslash( $_SERVER['REMOTE_ADDR'] ),
+ $options_site_url
+ );
+
+ /**
+ * Filters the message body of the new user activation email sent
+ * to the network administrator.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $msg Email body.
+ * @param WP_User $user WP_User instance of the new user.
+ */
+ $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user );
+
+ /* translators: New user notification email subject. %s: User login. */
+ wp_mail( $email, sprintf( __( 'New User Registration: %s' ), $user->user_login ), $msg );
+
+ return true;
+}
+
+/**
+ * Checks whether a site name is already taken.
+ *
+ * The name is the site's subdomain or the site's subdirectory
+ * path depending on the network settings.
+ *
+ * Used during the new site registration process to ensure
+ * that each site name is unique.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $domain The domain to be checked.
+ * @param string $path The path to be checked.
+ * @param int $network_id Optional. Network ID. Only relevant on multi-network installations.
+ * Default 1.
+ * @return int|null The site ID if the site name exists, null otherwise.
+ */
+function domain_exists( $domain, $path, $network_id = 1 ) {
+ $path = trailingslashit( $path );
+ $args = array(
+ 'network_id' => $network_id,
+ 'domain' => $domain,
+ 'path' => $path,
+ 'fields' => 'ids',
+ 'number' => 1,
+ 'update_site_meta_cache' => false,
+ );
+ $result = get_sites( $args );
+ $result = array_shift( $result );
+
+ /**
+ * Filters whether a site name is taken.
+ *
+ * The name is the site's subdomain or the site's subdirectory
+ * path depending on the network settings.
+ *
+ * @since 3.5.0
+ *
+ * @param int|null $result The site ID if the site name exists, null otherwise.
+ * @param string $domain Domain to be checked.
+ * @param string $path Path to be checked.
+ * @param int $network_id Network ID. Only relevant on multi-network installations.
+ */
+ return apply_filters( 'domain_exists', $result, $domain, $path, $network_id );
+}
+
+/**
+ * Notifies the site administrator that their site activation was successful.
+ *
+ * Filter {@see 'wpmu_welcome_notification'} to disable or bypass.
+ *
+ * Filter {@see 'update_welcome_email'} and {@see 'update_welcome_subject'} to
+ * modify the content and subject line of the notification email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $blog_id Site ID.
+ * @param int $user_id User ID.
+ * @param string $password User password, or "N/A" if the user account is not new.
+ * @param string $title Site title.
+ * @param array $meta Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
+ * @return bool Whether the email notification was sent.
+ */
+function wpmu_welcome_notification( $blog_id, $user_id, $password, $title, $meta = array() ) {
+ $current_network = get_network();
+
+ /**
+ * Filters whether to bypass the welcome email sent to the site administrator after site activation.
+ *
+ * Returning false disables the welcome email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int|false $blog_id Site ID, or false to prevent the email from sending.
+ * @param int $user_id User ID of the site administrator.
+ * @param string $password User password, or "N/A" if the user account is not new.
+ * @param string $title Site title.
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ if ( ! apply_filters( 'wpmu_welcome_notification', $blog_id, $user_id, $password, $title, $meta ) ) {
+ return false;
+ }
+
+ $user = get_userdata( $user_id );
+
+ $switched_locale = switch_to_user_locale( $user_id );
+
+ $welcome_email = get_site_option( 'welcome_email' );
+ if ( false == $welcome_email ) {
+ /* translators: Do not translate USERNAME, SITE_NAME, BLOG_URL, PASSWORD: those are placeholders. */
+ $welcome_email = __(
+ 'Howdy USERNAME,
+
+Your new SITE_NAME site has been successfully set up at:
+BLOG_URL
+
+You can log in to the administrator account with the following information:
+
+Username: USERNAME
+Password: PASSWORD
+Log in here: BLOG_URLwp-login.php
+
+We hope you enjoy your new site. Thanks!
+
+--The Team @ SITE_NAME'
+ );
+ }
+
+ $url = get_blogaddress_by_id( $blog_id );
+
+ $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email );
+ $welcome_email = str_replace( 'BLOG_TITLE', $title, $welcome_email );
+ $welcome_email = str_replace( 'BLOG_URL', $url, $welcome_email );
+ $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email );
+ $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email );
+
+ /**
+ * Filters the content of the welcome email sent to the site administrator after site activation.
+ *
+ * Content should be formatted for transmission via wp_mail().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $welcome_email Message body of the email.
+ * @param int $blog_id Site ID.
+ * @param int $user_id User ID of the site administrator.
+ * @param string $password User password, or "N/A" if the user account is not new.
+ * @param string $title Site title.
+ * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id.
+ */
+ $welcome_email = apply_filters( 'update_welcome_email', $welcome_email, $blog_id, $user_id, $password, $title, $meta );
+
+ $admin_email = get_site_option( 'admin_email' );
+
+ if ( '' === $admin_email ) {
+ $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST );
+ }
+
+ $from_name = ( '' !== get_site_option( 'site_name' ) ) ? esc_html( get_site_option( 'site_name' ) ) : 'WordPress';
+ $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n";
+ $message = $welcome_email;
+
+ if ( empty( $current_network->site_name ) ) {
+ $current_network->site_name = 'WordPress';
+ }
+
+ /* translators: New site notification email subject. 1: Network title, 2: New site title. */
+ $subject = __( 'New %1$s Site: %2$s' );
+
+ /**
+ * Filters the subject of the welcome email sent to the site administrator after site activation.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $subject Subject of the email.
+ */
+ $subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) );
+
+ wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+
+ return true;
+}
+
+/**
+ * Notifies the Multisite network administrator that a new site was created.
+ *
+ * Filter {@see 'send_new_site_email'} to disable or bypass.
+ *
+ * Filter {@see 'new_site_email'} to filter the contents.
+ *
+ * @since 5.6.0
+ *
+ * @param int $site_id Site ID of the new site.
+ * @param int $user_id User ID of the administrator of the new site.
+ * @return bool Whether the email notification was sent.
+ */
+function wpmu_new_site_admin_notification( $site_id, $user_id ) {
+ $site = get_site( $site_id );
+ $user = get_userdata( $user_id );
+ $email = get_site_option( 'admin_email' );
+
+ if ( ! $site || ! $user || ! $email ) {
+ return false;
+ }
+
+ /**
+ * Filters whether to send an email to the Multisite network administrator when a new site is created.
+ *
+ * Return false to disable sending the email.
+ *
+ * @since 5.6.0
+ *
+ * @param bool $send Whether to send the email.
+ * @param WP_Site $site Site object of the new site.
+ * @param WP_User $user User object of the administrator of the new site.
+ */
+ if ( ! apply_filters( 'send_new_site_email', true, $site, $user ) ) {
+ return false;
+ }
+
+ $switched_locale = false;
+ $network_admin = get_user_by( 'email', $email );
+
+ if ( $network_admin ) {
+ // If the network admin email address corresponds to a user, switch to their locale.
+ $switched_locale = switch_to_user_locale( $network_admin->ID );
+ } else {
+ // Otherwise switch to the locale of the current site.
+ $switched_locale = switch_to_locale( get_locale() );
+ }
+
+ $subject = sprintf(
+ /* translators: New site notification email subject. %s: Network title. */
+ __( '[%s] New Site Created' ),
+ get_network()->site_name
+ );
+
+ $message = sprintf(
+ /* translators: New site notification email. 1: User login, 2: Site URL, 3: Site title. */
+ __(
+ 'New site created by %1$s
+
+Address: %2$s
+Name: %3$s'
+ ),
+ $user->user_login,
+ get_site_url( $site->id ),
+ get_blog_option( $site->id, 'blogname' )
+ );
+
+ $header = sprintf(
+ 'From: "%1$s" <%2$s>',
+ _x( 'Site Admin', 'email "From" field' ),
+ $email
+ );
+
+ $new_site_email = array(
+ 'to' => $email,
+ 'subject' => $subject,
+ 'message' => $message,
+ 'headers' => $header,
+ );
+
+ /**
+ * Filters the content of the email sent to the Multisite network administrator when a new site is created.
+ *
+ * Content should be formatted for transmission via wp_mail().
+ *
+ * @since 5.6.0
+ *
+ * @param array $new_site_email {
+ * Used to build wp_mail().
+ *
+ * @type string $to The email address of the recipient.
+ * @type string $subject The subject of the email.
+ * @type string $message The content of the email.
+ * @type string $headers Headers.
+ * }
+ * @param WP_Site $site Site object of the new site.
+ * @param WP_User $user User object of the administrator of the new site.
+ */
+ $new_site_email = apply_filters( 'new_site_email', $new_site_email, $site, $user );
+
+ wp_mail(
+ $new_site_email['to'],
+ wp_specialchars_decode( $new_site_email['subject'] ),
+ $new_site_email['message'],
+ $new_site_email['headers']
+ );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+
+ return true;
+}
+
+/**
+ * Notifies a user that their account activation has been successful.
+ *
+ * Filter {@see 'wpmu_welcome_user_notification'} to disable or bypass.
+ *
+ * Filter {@see 'update_welcome_user_email'} and {@see 'update_welcome_user_subject'} to
+ * modify the content and subject line of the notification email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ * @param string $password User password.
+ * @param array $meta Optional. Signup meta data. Default empty array.
+ * @return bool
+ */
+function wpmu_welcome_user_notification( $user_id, $password, $meta = array() ) {
+ $current_network = get_network();
+
+ /**
+ * Filters whether to bypass the welcome email after user activation.
+ *
+ * Returning false disables the welcome email.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ * @param string $password User password.
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ if ( ! apply_filters( 'wpmu_welcome_user_notification', $user_id, $password, $meta ) ) {
+ return false;
+ }
+
+ $welcome_email = get_site_option( 'welcome_user_email' );
+
+ $user = get_userdata( $user_id );
+
+ $switched_locale = switch_to_user_locale( $user_id );
+
+ /**
+ * Filters the content of the welcome email after user activation.
+ *
+ * Content should be formatted for transmission via wp_mail().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $welcome_email The message body of the account activation success email.
+ * @param int $user_id User ID.
+ * @param string $password User password.
+ * @param array $meta Signup meta data. Default empty array.
+ */
+ $welcome_email = apply_filters( 'update_welcome_user_email', $welcome_email, $user_id, $password, $meta );
+ $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email );
+ $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email );
+ $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email );
+ $welcome_email = str_replace( 'LOGINLINK', wp_login_url(), $welcome_email );
+
+ $admin_email = get_site_option( 'admin_email' );
+
+ if ( '' === $admin_email ) {
+ $admin_email = 'support@' . wp_parse_url( network_home_url(), PHP_URL_HOST );
+ }
+
+ $from_name = ( '' !== get_site_option( 'site_name' ) ) ? esc_html( get_site_option( 'site_name' ) ) : 'WordPress';
+ $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n";
+ $message = $welcome_email;
+
+ if ( empty( $current_network->site_name ) ) {
+ $current_network->site_name = 'WordPress';
+ }
+
+ /* translators: New user notification email subject. 1: Network title, 2: New user login. */
+ $subject = __( 'New %1$s User: %2$s' );
+
+ /**
+ * Filters the subject of the welcome email after user activation.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $subject Subject of the email.
+ */
+ $subject = apply_filters( 'update_welcome_user_subject', sprintf( $subject, $current_network->site_name, $user->user_login ) );
+
+ wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+
+ return true;
+}
+
+/**
+ * Gets the current network.
+ *
+ * Returns an object containing the 'id', 'domain', 'path', and 'site_name'
+ * properties of the network being viewed.
+ *
+ * @see wpmu_current_site()
+ *
+ * @since MU (3.0.0)
+ *
+ * @global WP_Network $current_site The current network.
+ *
+ * @return WP_Network The current network.
+ */
+function get_current_site() {
+ global $current_site;
+ return $current_site;
+}
+
+/**
+ * Gets a user's most recent post.
+ *
+ * Walks through each of a user's blogs to find the post with
+ * the most recent post_date_gmt.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $user_id User ID.
+ * @return array Contains the blog_id, post_id, post_date_gmt, and post_gmt_ts.
+ */
+function get_most_recent_post_of_user( $user_id ) {
+ global $wpdb;
+
+ $user_blogs = get_blogs_of_user( (int) $user_id );
+ $most_recent_post = array();
+
+ /*
+ * Walk through each blog and get the most recent post
+ * published by $user_id.
+ */
+ foreach ( (array) $user_blogs as $blog ) {
+ $prefix = $wpdb->get_blog_prefix( $blog->userblog_id );
+ $recent_post = $wpdb->get_row( $wpdb->prepare( "SELECT ID, post_date_gmt FROM {$prefix}posts WHERE post_author = %d AND post_type = 'post' AND post_status = 'publish' ORDER BY post_date_gmt DESC LIMIT 1", $user_id ), ARRAY_A );
+
+ // Make sure we found a post.
+ if ( isset( $recent_post['ID'] ) ) {
+ $post_gmt_ts = strtotime( $recent_post['post_date_gmt'] );
+
+ /*
+ * If this is the first post checked
+ * or if this post is newer than the current recent post,
+ * make it the new most recent post.
+ */
+ if ( ! isset( $most_recent_post['post_gmt_ts'] ) || ( $post_gmt_ts > $most_recent_post['post_gmt_ts'] ) ) {
+ $most_recent_post = array(
+ 'blog_id' => $blog->userblog_id,
+ 'post_id' => $recent_post['ID'],
+ 'post_date_gmt' => $recent_post['post_date_gmt'],
+ 'post_gmt_ts' => $post_gmt_ts,
+ );
+ }
+ }
+ }
+
+ return $most_recent_post;
+}
+
+//
+// Misc functions.
+//
+
+/**
+ * Checks an array of MIME types against a list of allowed types.
+ *
+ * WordPress ships with a set of allowed upload filetypes,
+ * which is defined in wp-includes/functions.php in
+ * get_allowed_mime_types(). This function is used to filter
+ * that list against the filetypes allowed provided by Multisite
+ * Super Admins at wp-admin/network/settings.php.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param array $mimes
+ * @return array
+ */
+function check_upload_mimes( $mimes ) {
+ $site_exts = explode( ' ', get_site_option( 'upload_filetypes', 'jpg jpeg png gif' ) );
+ $site_mimes = array();
+ foreach ( $site_exts as $ext ) {
+ foreach ( $mimes as $ext_pattern => $mime ) {
+ if ( '' !== $ext && str_contains( $ext_pattern, $ext ) ) {
+ $site_mimes[ $ext_pattern ] = $mime;
+ }
+ }
+ }
+ return $site_mimes;
+}
+
+/**
+ * Updates a blog's post count.
+ *
+ * WordPress MS stores a blog's post count as an option so as
+ * to avoid extraneous COUNTs when a blog's details are fetched
+ * with get_site(). This function is called when posts are published
+ * or unpublished to make sure the count stays current.
+ *
+ * @since MU (3.0.0)
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $deprecated Not used.
+ */
+function update_posts_count( $deprecated = '' ) {
+ global $wpdb;
+ update_option( 'post_count', (int) $wpdb->get_var( "SELECT COUNT(ID) FROM {$wpdb->posts} WHERE post_status = 'publish' and post_type = 'post'" ) );
+}
+
+/**
+ * Logs the user email, IP, and registration date of a new site.
+ *
+ * @since MU (3.0.0)
+ * @since 5.1.0 Parameters now support input from the {@see 'wp_initialize_site'} action.
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param WP_Site|int $blog_id The new site's object or ID.
+ * @param int|array $user_id User ID, or array of arguments including 'user_id'.
+ */
+function wpmu_log_new_registrations( $blog_id, $user_id ) {
+ global $wpdb;
+
+ if ( is_object( $blog_id ) ) {
+ $blog_id = $blog_id->blog_id;
+ }
+
+ if ( is_array( $user_id ) ) {
+ $user_id = ! empty( $user_id['user_id'] ) ? $user_id['user_id'] : 0;
+ }
+
+ $user = get_userdata( (int) $user_id );
+ if ( $user ) {
+ $wpdb->insert(
+ $wpdb->registration_log,
+ array(
+ 'email' => $user->user_email,
+ 'IP' => preg_replace( '/[^0-9., ]/', '', wp_unslash( $_SERVER['REMOTE_ADDR'] ) ),
+ 'blog_id' => $blog_id,
+ 'date_registered' => current_time( 'mysql' ),
+ )
+ );
+ }
+}
+
+/**
+ * Ensures that the current site's domain is listed in the allowed redirect host list.
+ *
+ * @see wp_validate_redirect()
+ * @since MU (3.0.0)
+ *
+ * @param array|string $deprecated Not used.
+ * @return string[] {
+ * An array containing the current site's domain.
+ *
+ * @type string $0 The current site's domain.
+ * }
+ */
+function redirect_this_site( $deprecated = '' ) {
+ return array( get_network()->domain );
+}
+
+/**
+ * Checks whether an upload is too big.
+ *
+ * @since MU (3.0.0)
+ *
+ * @blessed
+ *
+ * @param array $upload An array of information about the newly-uploaded file.
+ * @return string|array If the upload is under the size limit, $upload is returned. Otherwise returns an error message.
+ */
+function upload_is_file_too_big( $upload ) {
+ if ( ! is_array( $upload ) || defined( 'WP_IMPORTING' ) || get_site_option( 'upload_space_check_disabled' ) ) {
+ return $upload;
+ }
+
+ if ( strlen( $upload['bits'] ) > ( KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ) ) ) {
+ /* translators: %s: Maximum allowed file size in kilobytes. */
+ return sprintf( __( 'This file is too big. Files must be less than %s KB in size.' ) . '<br />', get_site_option( 'fileupload_maxk', 1500 ) );
+ }
+
+ return $upload;
+}
+
+/**
+ * Adds a nonce field to the signup page.
+ *
+ * @since MU (3.0.0)
+ */
+function signup_nonce_fields() {
+ $id = mt_rand();
+ echo "<input type='hidden' name='signup_form_id' value='{$id}' />";
+ wp_nonce_field( 'signup_form_' . $id, '_signup_form', false );
+}
+
+/**
+ * Processes the signup nonce created in signup_nonce_fields().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param array $result
+ * @return array
+ */
+function signup_nonce_check( $result ) {
+ if ( ! strpos( $_SERVER['PHP_SELF'], 'wp-signup.php' ) ) {
+ return $result;
+ }
+
+ if ( ! wp_verify_nonce( $_POST['_signup_form'], 'signup_form_' . $_POST['signup_form_id'] ) ) {
+ $result['errors']->add( 'invalid_nonce', __( 'Unable to submit this form, please try again.' ) );
+ }
+
+ return $result;
+}
+
+/**
+ * Corrects 404 redirects when NOBLOGREDIRECT is defined.
+ *
+ * @since MU (3.0.0)
+ */
+function maybe_redirect_404() {
+ if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) ) {
+ /**
+ * Filters the redirect URL for 404s on the main site.
+ *
+ * The filter is only evaluated if the NOBLOGREDIRECT constant is defined.
+ *
+ * @since 3.0.0
+ *
+ * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT.
+ */
+ $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT );
+
+ if ( $destination ) {
+ if ( '%siteurl%' === $destination ) {
+ $destination = network_home_url();
+ }
+
+ wp_redirect( $destination );
+ exit;
+ }
+ }
+}
+
+/**
+ * Adds a new user to a blog by visiting /newbloguser/{key}/.
+ *
+ * This will only work when the user's details are saved as an option
+ * keyed as 'new_user_{key}', where '{key}' is a hash generated for the user to be
+ * added, as when a user is invited through the regular WP Add User interface.
+ *
+ * @since MU (3.0.0)
+ */
+function maybe_add_existing_user_to_blog() {
+ if ( ! str_contains( $_SERVER['REQUEST_URI'], '/newbloguser/' ) ) {
+ return;
+ }
+
+ $parts = explode( '/', $_SERVER['REQUEST_URI'] );
+ $key = array_pop( $parts );
+
+ if ( '' === $key ) {
+ $key = array_pop( $parts );
+ }
+
+ $details = get_option( 'new_user_' . $key );
+ if ( ! empty( $details ) ) {
+ delete_option( 'new_user_' . $key );
+ }
+
+ if ( empty( $details ) || is_wp_error( add_existing_user_to_blog( $details ) ) ) {
+ wp_die(
+ sprintf(
+ /* translators: %s: Home URL. */
+ __( 'An error occurred adding you to this site. Go to the <a href="%s">homepage</a>.' ),
+ home_url()
+ )
+ );
+ }
+
+ wp_die(
+ sprintf(
+ /* translators: 1: Home URL, 2: Admin URL. */
+ __( 'You have been added to this site. Please visit the <a href="%1$s">homepage</a> or <a href="%2$s">log in</a> using your username and password.' ),
+ home_url(),
+ admin_url()
+ ),
+ __( 'WordPress &rsaquo; Success' ),
+ array( 'response' => 200 )
+ );
+}
+
+/**
+ * Adds a user to a blog based on details from maybe_add_existing_user_to_blog().
+ *
+ * @since MU (3.0.0)
+ *
+ * @param array|false $details {
+ * User details. Must at least contain values for the keys listed below.
+ *
+ * @type int $user_id The ID of the user being added to the current blog.
+ * @type string $role The role to be assigned to the user.
+ * }
+ * @return true|WP_Error|void True on success or a WP_Error object if the user doesn't exist
+ * or could not be added. Void if $details array was not provided.
+ */
+function add_existing_user_to_blog( $details = false ) {
+ if ( is_array( $details ) ) {
+ $blog_id = get_current_blog_id();
+ $result = add_user_to_blog( $blog_id, $details['user_id'], $details['role'] );
+
+ /**
+ * Fires immediately after an existing user is added to a site.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $user_id User ID.
+ * @param true|WP_Error $result True on success or a WP_Error object if the user doesn't exist
+ * or could not be added.
+ */
+ do_action( 'added_existing_user', $details['user_id'], $result );
+
+ return $result;
+ }
+}
+
+/**
+ * Adds a newly created user to the appropriate blog
+ *
+ * To add a user in general, use add_user_to_blog(). This function
+ * is specifically hooked into the {@see 'wpmu_activate_user'} action.
+ *
+ * @since MU (3.0.0)
+ *
+ * @see add_user_to_blog()
+ *
+ * @param int $user_id User ID.
+ * @param string $password User password. Ignored.
+ * @param array $meta Signup meta data.
+ */
+function add_new_user_to_blog( $user_id, $password, $meta ) {
+ if ( ! empty( $meta['add_to_blog'] ) ) {
+ $blog_id = $meta['add_to_blog'];
+ $role = $meta['new_role'];
+ remove_user_from_blog( $user_id, get_network()->site_id ); // Remove user from main blog.
+
+ $result = add_user_to_blog( $blog_id, $user_id, $role );
+
+ if ( ! is_wp_error( $result ) ) {
+ update_user_meta( $user_id, 'primary_blog', $blog_id );
+ }
+ }
+}
+
+/**
+ * Corrects From host on outgoing mail to match the site domain.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param PHPMailer $phpmailer The PHPMailer instance (passed by reference).
+ */
+function fix_phpmailer_messageid( $phpmailer ) {
+ $phpmailer->Hostname = get_network()->domain;
+}
+
+/**
+ * Determines whether a user is marked as a spammer, based on user login.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string|WP_User $user Optional. Defaults to current user. WP_User object,
+ * or user login name as a string.
+ * @return bool
+ */
+function is_user_spammy( $user = null ) {
+ if ( ! ( $user instanceof WP_User ) ) {
+ if ( $user ) {
+ $user = get_user_by( 'login', $user );
+ } else {
+ $user = wp_get_current_user();
+ }
+ }
+
+ return $user && isset( $user->spam ) && 1 == $user->spam;
+}
+
+/**
+ * Updates this blog's 'public' setting in the global blogs table.
+ *
+ * Public blogs have a setting of 1, private blogs are 0.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param int $old_value The old public value.
+ * @param int $value The new public value.
+ */
+function update_blog_public( $old_value, $value ) {
+ update_blog_status( get_current_blog_id(), 'public', (int) $value );
+}
+
+/**
+ * Determines whether users can self-register, based on Network settings.
+ *
+ * @since MU (3.0.0)
+ *
+ * @return bool
+ */
+function users_can_register_signup_filter() {
+ $registration = get_site_option( 'registration' );
+ return ( 'all' === $registration || 'user' === $registration );
+}
+
+/**
+ * Ensures that the welcome message is not empty. Currently unused.
+ *
+ * @since MU (3.0.0)
+ *
+ * @param string $text
+ * @return string
+ */
+function welcome_user_msg_filter( $text ) {
+ if ( ! $text ) {
+ remove_filter( 'site_option_welcome_user_email', 'welcome_user_msg_filter' );
+
+ /* translators: Do not translate USERNAME, PASSWORD, LOGINLINK, SITE_NAME: those are placeholders. */
+ $text = __(
+ 'Howdy USERNAME,
+
+Your new account is set up.
+
+You can log in with the following information:
+Username: USERNAME
+Password: PASSWORD
+LOGINLINK
+
+Thanks!
+
+--The Team @ SITE_NAME'
+ );
+ update_site_option( 'welcome_user_email', $text );
+ }
+ return $text;
+}
+
+/**
+ * Determines whether to force SSL on content.
+ *
+ * @since 2.8.5
+ *
+ * @param bool $force
+ * @return bool True if forced, false if not forced.
+ */
+function force_ssl_content( $force = '' ) {
+ static $forced_content = false;
+
+ if ( ! $force ) {
+ $old_forced = $forced_content;
+ $forced_content = $force;
+ return $old_forced;
+ }
+
+ return $forced_content;
+}
+
+/**
+ * Formats a URL to use https.
+ *
+ * Useful as a filter.
+ *
+ * @since 2.8.5
+ *
+ * @param string $url URL.
+ * @return string URL with https as the scheme.
+ */
+function filter_SSL( $url ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
+ if ( ! is_string( $url ) ) {
+ return get_bloginfo( 'url' ); // Return home site URL with proper scheme.
+ }
+
+ if ( force_ssl_content() && is_ssl() ) {
+ $url = set_url_scheme( $url, 'https' );
+ }
+
+ return $url;
+}
+
+/**
+ * Schedules update of the network-wide counts for the current network.
+ *
+ * @since 3.1.0
+ */
+function wp_schedule_update_network_counts() {
+ if ( ! is_main_site() ) {
+ return;
+ }
+
+ if ( ! wp_next_scheduled( 'update_network_counts' ) && ! wp_installing() ) {
+ wp_schedule_event( time(), 'twicedaily', 'update_network_counts' );
+ }
+}
+
+/**
+ * Updates the network-wide counts for the current network.
+ *
+ * @since 3.1.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ */
+function wp_update_network_counts( $network_id = null ) {
+ wp_update_network_user_counts( $network_id );
+ wp_update_network_site_counts( $network_id );
+}
+
+/**
+ * Updates the count of sites for the current network.
+ *
+ * If enabled through the {@see 'enable_live_network_counts'} filter, update the sites count
+ * on a network when a site is created or its status is updated.
+ *
+ * @since 3.7.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ */
+function wp_maybe_update_network_site_counts( $network_id = null ) {
+ $is_small_network = ! wp_is_large_network( 'sites', $network_id );
+
+ /**
+ * Filters whether to update network site or user counts when a new site is created.
+ *
+ * @since 3.7.0
+ *
+ * @see wp_is_large_network()
+ *
+ * @param bool $small_network Whether the network is considered small.
+ * @param string $context Context. Either 'users' or 'sites'.
+ */
+ if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'sites' ) ) {
+ return;
+ }
+
+ wp_update_network_site_counts( $network_id );
+}
+
+/**
+ * Updates the network-wide users count.
+ *
+ * If enabled through the {@see 'enable_live_network_counts'} filter, update the users count
+ * on a network when a user is created or its status is updated.
+ *
+ * @since 3.7.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ */
+function wp_maybe_update_network_user_counts( $network_id = null ) {
+ $is_small_network = ! wp_is_large_network( 'users', $network_id );
+
+ /** This filter is documented in wp-includes/ms-functions.php */
+ if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'users' ) ) {
+ return;
+ }
+
+ wp_update_network_user_counts( $network_id );
+}
+
+/**
+ * Updates the network-wide site count.
+ *
+ * @since 3.7.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ */
+function wp_update_network_site_counts( $network_id = null ) {
+ $network_id = (int) $network_id;
+ if ( ! $network_id ) {
+ $network_id = get_current_network_id();
+ }
+
+ $count = get_sites(
+ array(
+ 'network_id' => $network_id,
+ 'spam' => 0,
+ 'deleted' => 0,
+ 'archived' => 0,
+ 'count' => true,
+ 'update_site_meta_cache' => false,
+ )
+ );
+
+ update_network_option( $network_id, 'blog_count', $count );
+}
+
+/**
+ * Updates the network-wide user count.
+ *
+ * @since 3.7.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ * @since 6.0.0 This function is now a wrapper for wp_update_user_counts().
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
+ */
+function wp_update_network_user_counts( $network_id = null ) {
+ wp_update_user_counts( $network_id );
+}
+
+/**
+ * Returns the space used by the current site.
+ *
+ * @since 3.5.0
+ *
+ * @return int Used space in megabytes.
+ */
+function get_space_used() {
+ /**
+ * Filters the amount of storage space used by the current site, in megabytes.
+ *
+ * @since 3.5.0
+ *
+ * @param int|false $space_used The amount of used space, in megabytes. Default false.
+ */
+ $space_used = apply_filters( 'pre_get_space_used', false );
+
+ if ( false === $space_used ) {
+ $upload_dir = wp_upload_dir();
+ $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES;
+ }
+
+ return $space_used;
+}
+
+/**
+ * Returns the upload quota for the current blog.
+ *
+ * @since MU (3.0.0)
+ *
+ * @return int Quota in megabytes.
+ */
+function get_space_allowed() {
+ $space_allowed = get_option( 'blog_upload_space' );
+
+ if ( ! is_numeric( $space_allowed ) ) {
+ $space_allowed = get_site_option( 'blog_upload_space' );
+ }
+
+ if ( ! is_numeric( $space_allowed ) ) {
+ $space_allowed = 100;
+ }
+
+ /**
+ * Filters the upload quota for the current site.
+ *
+ * @since 3.7.0
+ *
+ * @param int $space_allowed Upload quota in megabytes for the current blog.
+ */
+ return apply_filters( 'get_space_allowed', $space_allowed );
+}
+
+/**
+ * Determines if there is any upload space left in the current blog's quota.
+ *
+ * @since 3.0.0
+ *
+ * @return int of upload space available in bytes.
+ */
+function get_upload_space_available() {
+ $allowed = get_space_allowed();
+ if ( $allowed < 0 ) {
+ $allowed = 0;
+ }
+ $space_allowed = $allowed * MB_IN_BYTES;
+ if ( get_site_option( 'upload_space_check_disabled' ) ) {
+ return $space_allowed;
+ }
+
+ $space_used = get_space_used() * MB_IN_BYTES;
+
+ if ( ( $space_allowed - $space_used ) <= 0 ) {
+ return 0;
+ }
+
+ return $space_allowed - $space_used;
+}
+
+/**
+ * Determines if there is any upload space left in the current blog's quota.
+ *
+ * @since 3.0.0
+ * @return bool True if space is available, false otherwise.
+ */
+function is_upload_space_available() {
+ if ( get_site_option( 'upload_space_check_disabled' ) ) {
+ return true;
+ }
+
+ return (bool) get_upload_space_available();
+}
+
+/**
+ * Filters the maximum upload file size allowed, in bytes.
+ *
+ * @since 3.0.0
+ *
+ * @param int $size Upload size limit in bytes.
+ * @return int Upload size limit in bytes.
+ */
+function upload_size_limit_filter( $size ) {
+ $fileupload_maxk = (int) get_site_option( 'fileupload_maxk', 1500 );
+ $max_fileupload_in_bytes = KB_IN_BYTES * $fileupload_maxk;
+
+ if ( get_site_option( 'upload_space_check_disabled' ) ) {
+ return min( $size, $max_fileupload_in_bytes );
+ }
+
+ return min( $size, $max_fileupload_in_bytes, get_upload_space_available() );
+}
+
+/**
+ * Determines whether or not we have a large network.
+ *
+ * The default criteria for a large network is either more than 10,000 users or more than 10,000 sites.
+ * Plugins can alter this criteria using the {@see 'wp_is_large_network'} filter.
+ *
+ * @since 3.3.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param string $using 'sites' or 'users'. Default is 'sites'.
+ * @param int|null $network_id ID of the network. Default is the current network.
+ * @return bool True if the network meets the criteria for large. False otherwise.
+ */
+function wp_is_large_network( $using = 'sites', $network_id = null ) {
+ $network_id = (int) $network_id;
+ if ( ! $network_id ) {
+ $network_id = get_current_network_id();
+ }
+
+ if ( 'users' === $using ) {
+ $count = get_user_count( $network_id );
+
+ $is_large_network = wp_is_large_user_count( $network_id );
+
+ /**
+ * Filters whether the network is considered large.
+ *
+ * @since 3.3.0
+ * @since 4.8.0 The `$network_id` parameter has been added.
+ *
+ * @param bool $is_large_network Whether the network has more than 10000 users or sites.
+ * @param string $component The component to count. Accepts 'users', or 'sites'.
+ * @param int $count The count of items for the component.
+ * @param int $network_id The ID of the network being checked.
+ */
+ return apply_filters( 'wp_is_large_network', $is_large_network, 'users', $count, $network_id );
+ }
+
+ $count = get_blog_count( $network_id );
+
+ /** This filter is documented in wp-includes/ms-functions.php */
+ return apply_filters( 'wp_is_large_network', $count > 10000, 'sites', $count, $network_id );
+}
+
+/**
+ * Retrieves a list of reserved site on a sub-directory Multisite installation.
+ *
+ * @since 4.4.0
+ *
+ * @return string[] Array of reserved names.
+ */
+function get_subdirectory_reserved_names() {
+ $names = array(
+ 'page',
+ 'comments',
+ 'blog',
+ 'files',
+ 'feed',
+ 'wp-admin',
+ 'wp-content',
+ 'wp-includes',
+ 'wp-json',
+ 'embed',
+ );
+
+ /**
+ * Filters reserved site names on a sub-directory Multisite installation.
+ *
+ * @since 3.0.0
+ * @since 4.4.0 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added
+ * to the reserved names list.
+ *
+ * @param string[] $subdirectory_reserved_names Array of reserved names.
+ */
+ return apply_filters( 'subdirectory_reserved_names', $names );
+}
+
+/**
+ * Sends a confirmation request email when a change of network admin email address is attempted.
+ *
+ * The new network admin address will not become active until confirmed.
+ *
+ * @since 4.9.0
+ *
+ * @param string $old_value The old network admin email address.
+ * @param string $value The proposed new network admin email address.
+ */
+function update_network_option_new_admin_email( $old_value, $value ) {
+ if ( get_site_option( 'admin_email' ) === $value || ! is_email( $value ) ) {
+ return;
+ }
+
+ $hash = md5( $value . time() . mt_rand() );
+ $new_admin_email = array(
+ 'hash' => $hash,
+ 'newemail' => $value,
+ );
+ update_site_option( 'network_admin_hash', $new_admin_email );
+
+ $switched_locale = switch_to_user_locale( get_current_user_id() );
+
+ /* translators: Do not translate USERNAME, ADMIN_URL, EMAIL, SITENAME, SITEURL: those are placeholders. */
+ $email_text = __(
+ 'Howdy ###USERNAME###,
+
+You recently requested to have the network admin email address on
+your network changed.
+
+If this is correct, please click on the following link to change it:
+###ADMIN_URL###
+
+You can safely ignore and delete this email if you do not want to
+take this action.
+
+This email has been sent to ###EMAIL###
+
+Regards,
+All at ###SITENAME###
+###SITEURL###'
+ );
+
+ /**
+ * Filters the text of the email sent when a change of network admin email address is attempted.
+ *
+ * The following strings have a special meaning and will get replaced dynamically:
+ * ###USERNAME### The current user's username.
+ * ###ADMIN_URL### The link to click on to confirm the email change.
+ * ###EMAIL### The proposed new network admin email address.
+ * ###SITENAME### The name of the network.
+ * ###SITEURL### The URL to the network.
+ *
+ * @since 4.9.0
+ *
+ * @param string $email_text Text in the email.
+ * @param array $new_admin_email {
+ * Data relating to the new network admin email address.
+ *
+ * @type string $hash The secure hash used in the confirmation link URL.
+ * @type string $newemail The proposed new network admin email address.
+ * }
+ */
+ $content = apply_filters( 'new_network_admin_email_content', $email_text, $new_admin_email );
+
+ $current_user = wp_get_current_user();
+ $content = str_replace( '###USERNAME###', $current_user->user_login, $content );
+ $content = str_replace( '###ADMIN_URL###', esc_url( network_admin_url( 'settings.php?network_admin_hash=' . $hash ) ), $content );
+ $content = str_replace( '###EMAIL###', $value, $content );
+ $content = str_replace( '###SITENAME###', wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES ), $content );
+ $content = str_replace( '###SITEURL###', network_home_url(), $content );
+
+ wp_mail(
+ $value,
+ sprintf(
+ /* translators: Email change notification email subject. %s: Network title. */
+ __( '[%s] Network Admin Email Change Request' ),
+ wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES )
+ ),
+ $content
+ );
+
+ if ( $switched_locale ) {
+ restore_previous_locale();
+ }
+}
+
+/**
+ * Sends an email to the old network admin email address when the network admin email address changes.
+ *
+ * @since 4.9.0
+ *
+ * @param string $option_name The relevant database option name.
+ * @param string $new_email The new network admin email address.
+ * @param string $old_email The old network admin email address.
+ * @param int $network_id ID of the network.
+ */
+function wp_network_admin_email_change_notification( $option_name, $new_email, $old_email, $network_id ) {
+ $send = true;
+
+ // Don't send the notification to the default 'admin_email' value.
+ if ( 'you@example.com' === $old_email ) {
+ $send = false;
+ }
+
+ /**
+ * Filters whether to send the network admin email change notification email.
+ *
+ * @since 4.9.0
+ *
+ * @param bool $send Whether to send the email notification.
+ * @param string $old_email The old network admin email address.
+ * @param string $new_email The new network admin email address.
+ * @param int $network_id ID of the network.
+ */
+ $send = apply_filters( 'send_network_admin_email_change_email', $send, $old_email, $new_email, $network_id );
+
+ if ( ! $send ) {
+ return;
+ }
+
+ /* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */
+ $email_change_text = __(
+ 'Hi,
+
+This notice confirms that the network admin email address was changed on ###SITENAME###.
+
+The new network admin email address is ###NEW_EMAIL###.
+
+This email has been sent to ###OLD_EMAIL###
+
+Regards,
+All at ###SITENAME###
+###SITEURL###'
+ );
+
+ $email_change_email = array(
+ 'to' => $old_email,
+ /* translators: Network admin email change notification email subject. %s: Network title. */
+ 'subject' => __( '[%s] Network Admin Email Changed' ),
+ 'message' => $email_change_text,
+ 'headers' => '',
+ );
+ // Get network name.
+ $network_name = wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES );
+
+ /**
+ * Filters the contents of the email notification sent when the network admin email address is changed.
+ *
+ * @since 4.9.0
+ *
+ * @param array $email_change_email {
+ * Used to build wp_mail().
+ *
+ * @type string $to The intended recipient.
+ * @type string $subject The subject of the email.
+ * @type string $message The content of the email.
+ * The following strings have a special meaning and will get replaced dynamically:
+ * - ###OLD_EMAIL### The old network admin email address.
+ * - ###NEW_EMAIL### The new network admin email address.
+ * - ###SITENAME### The name of the network.
+ * - ###SITEURL### The URL to the site.
+ * @type string $headers Headers.
+ * }
+ * @param string $old_email The old network admin email address.
+ * @param string $new_email The new network admin email address.
+ * @param int $network_id ID of the network.
+ */
+ $email_change_email = apply_filters( 'network_admin_email_change_email', $email_change_email, $old_email, $new_email, $network_id );
+
+ $email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email, $email_change_email['message'] );
+ $email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email, $email_change_email['message'] );
+ $email_change_email['message'] = str_replace( '###SITENAME###', $network_name, $email_change_email['message'] );
+ $email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );
+
+ wp_mail(
+ $email_change_email['to'],
+ sprintf(
+ $email_change_email['subject'],
+ $network_name
+ ),
+ $email_change_email['message'],
+ $email_change_email['headers']
+ );
+}